SEAT WARMER SYSTEM DOES NOT OPERATE [SEAT WARMER SYSTEM]

id0903m2970800

Caution
•  Vehicle specifications differ depending on the vehicle identification number (VIN).
?  Type A VIN:
JM0 TC2WLA*# 100001—300000
JM0 TC4WLA*# 100001—300000
JMZ TB5WYA*# 100001—600000
JMZ TB6WYA*# 100001—600000
JMZ TBEWYA*# 100001—600000
JMZ TBFWYA*# 100001—600000
JM7 TC2WLA*# 100001—300000
JM7 TC4WLA*# 100001—300000
JM5 TCAWY**# 100001—300000
JM6 TC2WLA*# 100001—300000
JM6 TC4WLA*# 100001—300000
?  Type B VIN:
JM0 TC2WLA*# 300001—400000
JM0 TC4WLA*# 300001—400000
JMZ TB5WYA*# 600001—700000
JMZ TB6WYA*# 600001—700000
JMZ TBEWYA*# 600001—700000
JMZ TBFWYA*# 600001—700000
JM7 TC2WLA*# 300001—400000
JM7 TC4WLA*# 300001—400000
JM5 TCAWY**# 300001—400000
JM6 TC2WLA*# 300001—400000
JM6 TC4WLA*# 300001—400000
?  Type C VIN:
JM0 TC2WLA*# 400001—
JM0 TC4WLA*# 400001—
JMZ TB5WYA*# 700001—
JMZ TB6WYA*# 700001—
JMZ TBEWYA*# 700001—
JMZ TBFWYA*# 700001—
JM7 TC2WLA*# 400001—
JM7 TC4WLA*# 400001—
JM5 TCAWY**# 400001—
JM6 TC2WLA*# 400001—
JM6 TC4WLA*# 400001—

Front Seat Warmer


Type A VIN:

Description
The front seat warmer does not warm up even if the front seat warmer switch is turned on.
Possible Causes
•  Front seat warmer switch malfunction
•  Front seat warmer control unit power supply circuit malfunction
?  Short to ground in wiring harness between SEAT WARM 20 A fuse and front seat warmer control unit terminal O
?  Short to ground in wiring harness between SEAT WARM 20 A fuse and front seat warmer control unit terminal M
?  Open circuit in wiring harness between SEAT WARM 20 A fuse and front seat warmer control unit terminal O
?  Open circuit in wiring harness between SEAT WARM 20 A fuse and front seat warmer control unit terminal M
?  SEAT WARM 20 A fuse malfunction
?  Short to ground in wiring harness between front body control module (FBCM) terminal 1C and front seat warmer control unit terminal K
?  Open circuit in wiring harness between front body control module (FBCM) terminal 1C and front seat warmer control unit terminal K
•  Open circuit in wiring harness between the following terminals:
?  Front seat warmer control unit terminal G and body ground
?  Front seat warmer control unit terminal H and body ground
•  Malfunction in wiring harness between front seat warmer control unit terminal I and indicator unit terminal D
?  Short to ground in wiring harness between front seat warmer control unit terminal I and indicator unit terminal D
?  Open circuit in wiring harness between front seat warmer control unit terminal I and indicator unit terminal D
•  Indicator unit malfunction
•  Front seat warmer unit malfunction
•  Front seat warmer control unit malfunction
•  Connector poor contact or terminal damage

Diagnostic procedure

Step

Inspection

Action
1
DETERMINE MALFUNCTION SYMPTOM
•  Operate the front seat warmer switches on the driver and passenger sides to turn on the front seat warmer system for the driver and passenger sides.
•  Does a malfunction occur with the front seat warmer system on both sides?
Yes
Go to Step 8.
No
Go to the next step.
2
INSPECT FRONT SEAT WARMER CONTROL UNIT CONNECTOR AND FRONT SEAT WARMER UNIT CONNECTOR
•  Switch the ignition OFF.
•  Disconnect the negative battery terminal.
•  Disconnect the front seat warmer control unit connector and the front seat warmer unit connector on the side which does not operate.
•  Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 11.
3
VERIFY IF MALFUNCTION CAUSE IS FRONT SEAT WARMER CONTROL UNIT POWER SUPPLY CIRCUIT
•  Verify that the front seat warmer control unit connector is disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (vehicle wiring harness side).
?  Front seat warmer control unit terminal O
?  Front seat warmer control unit terminal M
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the SEAT WARM 20 A fuse.
If the fuse is blown:
•  Refer to the wiring diagram and verify if there is a common wiring harness between the following terminals.
?  SEAT WARM 20 A fuse and front seat warmer control unit terminal O
?  SEAT WARM 20 A fuse and front seat warmer control unit terminal M
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
•  Replace the fuse.
If the fuse is damaged:
•  Replace the fuse.
If the fuse is normal:
•  Refer to the wiring diagram and verify if there is a common wiring harness between the following terminals.
?  SEAT WARM 20 A fuse and front seat warmer control unit terminal O
?  SEAT WARM 20 A fuse and front seat warmer control unit terminal M
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 11.
4
VERIFY IF MALFUNCTION CAUSE IS FRONT SEAT WARMER CONTROL UNIT POWER SUPPLY CIRCUIT
•  Verify that the front seat warmer control unit connector is disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (vehicle wiring harness side).
?  Front seat warmer control unit terminal K
•  Is the voltage B+?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common wiring harness between the front body control module (FBCM) terminal 1C and front seat warmer control unit terminal K.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which is shorted to ground.
Go to Step 11.
5
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN FRONT SEAT WARMER CONTROL UNIT AND BODY GROUND
•  Switch the ignition OFF (LOCK).
•  Verify that the front seat warmer control unit connector is disconnected.
•  Inspect for continuity between the following terminals (vehicle wiring harness side) and body ground.
?  Front seat warmer control unit terminal H
?  Front seat warmer control unit terminal G
•  Is there continuity?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common connector between the following terminals and body ground.
?  Front seat warmer control unit terminal H
?  Front seat warmer control unit terminal G
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
•  Go to Step 11.
6
VERIFY IF MALFUNCTION CAUSE IS SHORT CIRCUIT TO GROUND IN WIRING HARNESS BETWEEN FRONT SEAT WARMER CONTROL UNIT AND INDICATOR UNIT
•  Verify that the front seat warmer control unit connector is disconnected.
•  Disconnect the indicator unit connector.
•  Inspect for continuity between front seat warmer control unit terminal I (vehicle wiring harness side) and body ground.
•  Is there continuity?
Yes
•  Refer to the wiring diagram and verify if there is a common connector between front seat warmer control unit terminal I and indicator unit terminal D.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which is shorted to ground.
•  Go to Step 11.
No
Go to the next step.
7
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN FRONT SEAT WARMER CONTROL UNIT AND INDICATOR UNIT
•  Verify that the front seat warmer control unit connector and the indicator unit connector are disconnected.
•  Inspect the wiring harness for continuity between front seat warmer control unit terminal I and indicator unit terminal D (vehicle wiring harness side).
•  Is there continuity?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common connector between front seat warmer control unit terminal I and indicator unit terminal D.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which has an open circuit.
•  Go to Step 11.
8
VERIFY IF MALFUNCTION CAUSE IS FRONT SEAT WARMER UNIT
•  Inspect the front seat warmer unit on the side which has a malfunction.
•  Is the front seat warmer unit normal?
Yes
Go to the next step.
No
Replace the front seat warmer unit (front seat cushion pad or front seat back pad) which has a malfunction, then go to Step 11.
(See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION.)
(See FRONT SEAT BACK TRIM REMOVAL/INSTALLATION.)
9
DETERMINE IF MALFUNCTION CAUSE IS INDICATOR UNIT
•  Inspect the indicator unit.
•  Is the indicator unit normal?
Yes
Go to the next step.
No
Replace the indicator unit, then go to Step 11.
(See INDICATOR UNIT REMOVAL/INSTALLATION.)
10
DETERMINE IF MALFUNCTION CAUSE IS FRONT SEAT WARMER CONTROL UNIT
•  Reconnect all the disconnected connectors.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Operate the front seat warmer switch to turn on the front seat warmer system.
•  Does the front seat warmer system operate normally?
Yes
Go to the next step.
No
Replace the front seat warmer control unit, then go to the next step.
(See FRONT SEAT WARMER CONTROL UNIT REMOVAL/INSTALLATION.)
11
VERIFY IF MALFUNCTION CAUSE IS CORRECTED
•  Operate the front seat warmer switch to turn on the front seat warmer system.
•  Does the front seat warmer system operate normally?
Yes
Troubleshooting completed. (Explain the contents of the servicing to the customer.)
No
Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
(See SYMPTOM TROUBLESHOOTING [SEAT WARMER SYSTEM].)


Type B VIN:

Description
The front seat warmer does not warm up even if the front seat warmer switch is turned on.
Possible Causes
•  Front seat warmer switch malfunction
•  Front seat warmer control unit power supply circuit malfunction
?  Short to ground in wiring harness between SEAT WARM 20 A fuse and front seat warmer control unit terminal O
?  Short to ground in wiring harness between SEAT WARM 20 A fuse and front seat warmer control unit terminal M
?  Open circuit in wiring harness between SEAT WARM 20 A fuse and front seat warmer control unit terminal O
?  Open circuit in wiring harness between SEAT WARM 20 A fuse and front seat warmer control unit terminal M
?  SEAT WARM 20 A fuse malfunction
?  Short to ground in wiring harness between front body control module (FBCM) terminal 1C and front seat warmer control unit terminal K
?  Open circuit in wiring harness between front body control module (FBCM) terminal 1C and front seat warmer control unit terminal K
•  Open circuit in wiring harness between the following terminals:
?  Front seat warmer control unit terminal G and body ground
?  Front seat warmer control unit terminal H and body ground
•  Malfunction in wiring harness between front seat warmer control unit terminal I and front climate control unit terminal 1X
?  Short to ground in wiring harness between front seat warmer control unit terminal I and front climate control unit terminal 1X
?  Open circuit in wiring harness between front seat warmer control unit terminal I and front climate control unit terminal 1X
•  Front climate control unit malfunction
•  Front seat warmer unit malfunction
•  Front seat warmer control unit malfunction
•  Connector poor contact or terminal damage

Diagnostic procedure

Step

Inspection

Action
1
DETERMINE MALFUNCTION SYMPTOM
•  Operate the front seat warmer switches on the driver and passenger sides to turn on the front seat warmer system for the driver and passenger sides.
•  Does a malfunction occur with the front seat warmer system on both sides?
Yes
Go to Step 8.
No
Go to the next step.
2
INSPECT FRONT SEAT WARMER CONTROL UNIT CONNECTOR AND FRONT SEAT WARMER UNIT CONNECTOR
•  Switch the ignition OFF.
•  Disconnect the negative battery terminal.
•  Disconnect the front seat warmer control unit connector and the front seat warmer unit connector on the side which does not operate.
•  Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 11.
3
VERIFY IF MALFUNCTION CAUSE IS FRONT SEAT WARMER CONTROL UNIT POWER SUPPLY CIRCUIT
•  Verify that the front seat warmer control unit connector is disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (vehicle wiring harness side).
?  Front seat warmer control unit terminal O
?  Front seat warmer control unit terminal M
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the SEAT WARM 20 A fuse.
If the fuse is blown:
•  Refer to the wiring diagram and verify if there is a common wiring harness between the following terminals.
?  SEAT WARM 20 A fuse and front seat warmer control unit terminal O
?  SEAT WARM 20 A fuse and front seat warmer control unit terminal M
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
•  Replace the fuse.
If the fuse is damaged:
•  Replace the fuse.
If the fuse is normal:
•  Refer to the wiring diagram and verify if there is a common wiring harness between the following terminals.
?  SEAT WARM 20 A fuse and front seat warmer control unit terminal O
?  SEAT WARM 20 A fuse and front seat warmer control unit terminal M
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 11.
4
VERIFY IF MALFUNCTION CAUSE IS FRONT SEAT WARMER CONTROL UNIT POWER SUPPLY CIRCUIT
•  Verify that the front seat warmer control unit connector is disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (vehicle wiring harness side).
?  Front seat warmer control unit terminal K
•  Is the voltage B+?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common wiring harness between the front body control module (FBCM) terminal 1C and front seat warmer control unit terminal K.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which is shorted to ground.
Go to Step 11.
5
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN FRONT SEAT WARMER CONTROL UNIT AND BODY GROUND
•  Switch the ignition OFF (LOCK).
•  Verify that the front seat warmer control unit connector is disconnected.
•  Inspect for continuity between the following terminals (vehicle wiring harness side) and body ground.
?  Front seat warmer control unit terminal H
?  Front seat warmer control unit terminal G
•  Is there continuity?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common connector between the following terminals and body ground.
?  Front seat warmer control unit terminal H
?  Front seat warmer control unit terminal G
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
•  Go to Step 11.
6
VERIFY IF MALFUNCTION CAUSE IS SHORT CIRCUIT TO GROUND IN WIRING HARNESS BETWEEN FRONT SEAT WARMER CONTROL UNIT AND FRONT CLIMATE CONTROL UNIT
•  Verify that the front seat warmer control unit connector is disconnected.
•  Disconnect the front climate control unit connector.
•  Inspect for continuity between front seat warmer control unit terminal I (vehicle wiring harness side) and body ground.
•  Is there continuity?
Yes
•  Refer to the wiring diagram and verify if there is a common connector between front seat warmer control unit terminal I and front climate control unit terminal 1X.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which is shorted to ground.
•  Go to Step 11.
No
Go to the next step.
7
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN FRONT SEAT WARMER CONTROL UNIT AND FRONT CLIMATE CONTROL UNIT
•  Verify that the front seat warmer control unit connector and the front climate control unit connector are disconnected.
•  Inspect the wiring harness for continuity between front seat warmer control unit terminal I and front climate control unit terminal 1X (vehicle wiring harness side).
•  Is there continuity?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common connector between front seat warmer control unit terminal I and front climate control unit terminal 1X.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which has an open circuit.
•  Go to Step 11.
8
VERIFY IF MALFUNCTION CAUSE IS FRONT SEAT WARMER UNIT
•  Inspect the front seat warmer unit on the side which has a malfunction.
•  Is the front seat warmer unit normal?
Yes
Go to the next step.
No
Replace the front seat warmer unit (front seat cushion pad or front seat back pad) which has a malfunction, then go to Step 11.
(See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION.)
(See FRONT SEAT BACK TRIM REMOVAL/INSTALLATION.)
9
DETERMINE IF MALFUNCTION CAUSE IS FRONT CLIMATE CONTROL UNIT
•  Inspect the front climate control unit.
•  Is the front climate control unit normal?
Yes
Go to the next step.
No
Replace the front climate control unit, then go to Step 11.
(See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)
10
DETERMINE IF MALFUNCTION CAUSE IS FRONT SEAT WARMER CONTROL UNIT
•  Reconnect all the disconnected connectors.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Operate the front seat warmer switch to turn on the front seat warmer system.
•  Does the front seat warmer system operate normally?
Yes
Go to the next step.
No
Replace the front seat warmer control unit, then go to the next step.
(See FRONT SEAT WARMER CONTROL UNIT REMOVAL/INSTALLATION.)
11
VERIFY IF MALFUNCTION CAUSE IS CORRECTED
•  Operate the front seat warmer switch to turn on the front seat warmer system.
•  Does the front seat warmer system operate normally?
Yes
Troubleshooting completed. (Explain the contents of the servicing to the customer.)
No
Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
(See SYMPTOM TROUBLESHOOTING [SEAT WARMER SYSTEM].)


Type C VIN:

Description
The front seat warmer does not warm up even if the front seat warmer switch is turned on.
Possible Causes
•  Front seat warmer switch malfunction
•  Front seat warmer control unit power supply circuit malfunction
?  Short to ground in wiring harness between SEAT WARM 20 A fuse and front seat warmer control unit terminal O
?  Short to ground in wiring harness between SEAT WARM 20 A fuse and front seat warmer control unit terminal M
?  Open circuit in wiring harness between SEAT WARM 20 A fuse and front seat warmer control unit terminal O
?  Open circuit in wiring harness between SEAT WARM 20 A fuse and front seat warmer control unit terminal M
?  SEAT WARM 20 A fuse malfunction
?  Short to ground in wiring harness between C/U IG1 15A fuse and front seat warmer control unit terminal K
?  Open circuit in wiring harness between C/U IG1 15A fuse and front seat warmer control unit terminal K
•  Open circuit in wiring harness between the following terminals:
?  Front seat warmer control unit terminal G and body ground
?  Front seat warmer control unit terminal H and body ground
•  Malfunction in wiring harness between front seat warmer control unit terminal I and front climate control unit terminal 1X
?  Short to ground in wiring harness between front seat warmer control unit terminal I and front climate control unit terminal 1X
?  Open circuit in wiring harness between front seat warmer control unit terminal I and front climate control unit terminal 1X
•  Front climate control unit malfunction
•  Front seat warmer unit malfunction
•  Front seat warmer control unit malfunction
•  Connector poor contact or terminal damage

Diagnostic procedure

Step

Inspection

Action
1
DETERMINE MALFUNCTION SYMPTOM
•  Operate the front seat warmer switches on the driver and passenger sides to turn on the front seat warmer system for the driver and passenger sides.
•  Does a malfunction occur with the front seat warmer system on both sides?
Yes
Go to Step 8.
No
Go to the next step.
2
INSPECT FRONT SEAT WARMER CONTROL UNIT CONNECTOR AND FRONT SEAT WARMER UNIT CONNECTOR
•  Switch the ignition OFF.
•  Disconnect the negative battery terminal.
•  Disconnect the front seat warmer control unit connector and the front seat warmer unit connector on the side which does not operate.
•  Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 11.
3
VERIFY IF MALFUNCTION CAUSE IS FRONT SEAT WARMER CONTROL UNIT POWER SUPPLY CIRCUIT
•  Verify that the front seat warmer control unit connector is disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (vehicle wiring harness side).
?  Front seat warmer control unit terminal O
?  Front seat warmer control unit terminal M
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the SEAT WARM 20 A fuse.
If the fuse is blown:
•  Refer to the wiring diagram and verify if there is a common wiring harness between the following terminals.
?  SEAT WARM 20 A fuse and front seat warmer control unit terminal O
?  SEAT WARM 20 A fuse and front seat warmer control unit terminal M
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
•  Replace the fuse.
If the fuse is damaged:
•  Replace the fuse.
If the fuse is normal:
•  Refer to the wiring diagram and verify if there is a common wiring harness between the following terminals.
?  SEAT WARM 20 A fuse and front seat warmer control unit terminal O
?  SEAT WARM 20 A fuse and front seat warmer control unit terminal M
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 11.
4
VERIFY IF MALFUNCTION CAUSE IS FRONT SEAT WARMER CONTROL UNIT POWER SUPPLY CIRCUIT
•  Verify that the front seat warmer control unit connector is disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (vehicle wiring harness side).
?  Front seat warmer control unit terminal K
•  Is the voltage B+?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common wiring harness between the C/U IG1 15A fuse and front seat warmer control unit terminal K.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which is shorted to ground.
Go to Step 11.
5
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN FRONT SEAT WARMER CONTROL UNIT AND BODY GROUND
•  Switch the ignition OFF (LOCK).
•  Verify that the front seat warmer control unit connector is disconnected.
•  Inspect for continuity between the following terminals (vehicle wiring harness side) and body ground.
?  Front seat warmer control unit terminal H
?  Front seat warmer control unit terminal G
•  Is there continuity?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common connector between the following terminals and body ground.
?  Front seat warmer control unit terminal H
?  Front seat warmer control unit terminal G
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
•  Go to Step 11.
6
VERIFY IF MALFUNCTION CAUSE IS SHORT CIRCUIT TO GROUND IN WIRING HARNESS BETWEEN FRONT SEAT WARMER CONTROL UNIT AND FRONT CLIMATE CONTROL UNIT
•  Verify that the front seat warmer control unit connector is disconnected.
•  Disconnect the front climate control unit connector.
•  Inspect for continuity between front seat warmer control unit terminal I (vehicle wiring harness side) and body ground.
•  Is there continuity?
Yes
•  Refer to the wiring diagram and verify if there is a common connector between front seat warmer control unit terminal I and front climate control unit terminal 1X.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which is shorted to ground.
•  Go to Step 11.
No
Go to the next step.
7
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN FRONT SEAT WARMER CONTROL UNIT AND FRONT CLIMATE CONTROL UNIT
•  Verify that the front seat warmer control unit connector and the front climate control unit connector are disconnected.
•  Inspect the wiring harness for continuity between front seat warmer control unit terminal I and front climate control unit terminal 1X (vehicle wiring harness side).
•  Is there continuity?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common connector between front seat warmer control unit terminal I and front climate control unit terminal 1X.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which has an open circuit.
•  Go to Step 11.
8
VERIFY IF MALFUNCTION CAUSE IS FRONT SEAT WARMER UNIT
•  Inspect the front seat warmer unit on the side which has a malfunction.
•  Is the front seat warmer unit normal?
Yes
Go to the next step.
No
Replace the front seat warmer unit (front seat cushion pad or front seat back pad) which has a malfunction, then go to Step 11.
(See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION.)
(See FRONT SEAT BACK TRIM REMOVAL/INSTALLATION.)
9
DETERMINE IF MALFUNCTION CAUSE IS FRONT CLIMATE CONTROL UNIT
•  Inspect the front climate control unit.
•  Is the front climate control unit normal?
Yes
Go to the next step.
No
Replace the front climate control unit, then go to Step 11.
(See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)
10
DETERMINE IF MALFUNCTION CAUSE IS FRONT SEAT WARMER CONTROL UNIT
•  Reconnect all the disconnected connectors.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Operate the front seat warmer switch to turn on the front seat warmer system.
•  Does the front seat warmer system operate normally?
Yes
Go to the next step.
No
Replace the front seat warmer control unit, then go to the next step.
(See FRONT SEAT WARMER CONTROL UNIT REMOVAL/INSTALLATION.)
11
VERIFY IF MALFUNCTION CAUSE IS CORRECTED
•  Operate the front seat warmer switch to turn on the front seat warmer system.
•  Does the front seat warmer system operate normally?
Yes
Troubleshooting completed. (Explain the contents of the servicing to the customer.)
No
Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
(See SYMPTOM TROUBLESHOOTING [SEAT WARMER SYSTEM].)


Second-row Seat Warmer


Type A,B VIN:

Description
The second-row seat warmer does not warm up even if the second-row seat warmer switch is turned on.
Possible Causes
•  Second-row seat warmer switch malfunction
•  Second-row seat warmer control unit power supply circuit malfunction
?  Short to ground in wiring harness between R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal O
?  Short to ground in wiring harness between R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal M
?  Open circuit in wiring harness between R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal O
?  Open circuit in wiring harness between R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal M
?  R SEAT WARM 20 A fuse malfunction
?  Short to ground in wiring harness between front body control module (FBCM) terminal 1C and second-row seat warmer control unit terminal A
?  Open circuit in wiring harness between front body control module (FBCM) terminal 1C and second-row seat warmer control unit terminal A
•  Open circuit in wiring harness between the following terminals:
?  Second-row seat warmer control unit terminal L and body ground
•  Malfunction in wiring harness between second-row seat warmer control unit terminal J and rear climate control unit terminal T
?  Short to ground in wiring harness between second-row seat warmer control unit terminal J and rear climate control unit terminal T
?  Open circuit in wiring harness between second-row seat warmer control unit terminal J and rear climate control unit terminal T
•  Rear climate control unit malfunction
•  Second-row seat warmer unit malfunction
•  Second-row seat warmer control unit malfunction
•  Connector poor contact or terminal damage

Diagnostic procedure

Step

Inspection

Action
1
DETERMINE MALFUNCTION SYMPTOM
•  Operate the second-row seat warmer switches on the driver and passenger sides to turn on the second-row seat warmer system for the driver and passenger sides.
•  Does a malfunction occur with the second-row seat warmer system on both sides?
Yes
Go to Step 8.
No
Go to the next step.
2
INSPECT SECOND-ROW SEAT WARMER CONTROL UNIT CONNECTOR AND SECOND-ROW SEAT WARMER UNIT CONNECTOR
•  Switch the ignition OFF.
•  Disconnect the negative battery terminal.
•  Disconnect the second-row seat warmer control unit connector and the second-row seat warmer unit connector on the side which does not operate.
•  Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 11.
3
VERIFY IF MALFUNCTION CAUSE IS SECOND-ROW SEAT WARMER CONTROL UNIT POWER SUPPLY CIRCUIT
•  Verify that the second-row seat warmer control unit connector is disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (vehicle wiring harness side).
?  Second-row seat warmer control unit terminal O
?  Second-row seat warmer control unit terminal M
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the R SEAT WARM 20 A fuse.
If the fuse is blown:
•  Refer to the wiring diagram and verify if there is a common wiring harness between the following terminals.
?  R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal O
?  R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal M
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
•  Replace the fuse.
If the fuse is damaged:
•  Replace the fuse.
If the fuse is normal:
•  Refer to the wiring diagram and verify if there is a common wiring harness between the following terminals.
?  R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal O
?  R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal M
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 11.
4
VERIFY IF MALFUNCTION CAUSE IS SECOND-ROW SEAT WARMER CONTROL UNIT POWER SUPPLY CIRCUIT
•  Verify that the second-row seat warmer control unit connector is disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (vehicle wiring harness side).
?  Second-row seat warmer control unit terminal A
•  Is the voltage B+?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common wiring harness between the front body control module (FBCM) terminal 1C and second-row seat warmer control unit terminal A.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which is shorted to ground.
Go to Step 11.
5
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN SECOND-ROW SEAT WARMER CONTROL UNIT AND BODY GROUND
•  Switch the ignition OFF (LOCK).
•  Verify that the second-row seat warmer control unit connector is disconnected.
•  Inspect for continuity between the following terminals (vehicle wiring harness side) and body ground.
?  Second-row seat warmer control unit terminal L
•  Is there continuity?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common connector between the following terminals and body ground.
?  Second-row seat warmer control unit terminal L
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
•  Go to Step 11.
6
VERIFY IF MALFUNCTION CAUSE IS SHORT CIRCUIT TO GROUND IN WIRING HARNESS BETWEEN SECOND-ROW SEAT WARMER CONTROL UNIT AND REAR CLIMATE CONTROL UNIT
•  Verify that the second-row seat warmer control unit connector is disconnected.
•  Disconnect the rear climate control unit connector.
•  Inspect for continuity between second-row seat warmer control unit terminal J (vehicle wiring harness side) and body ground.
•  Is there continuity?
Yes
•  Refer to the wiring diagram and verify if there is a common connector between second-row seat warmer control unit terminal J and rear climate control unit terminal T.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which is shorted to ground.
•  Go to Step 11.
No
Go to the next step.
7
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN SECOND-ROW SEAT WARMER CONTROL UNIT AND REAR CLIMATE CONTROL UNIT
•  Verify that the second-row seat warmer control unit connector and the rear climate control unit connector are disconnected.
•  Inspect the wiring harness for continuity between second-row seat warmer control unit terminal J and rear climate control unit terminal T (vehicle wiring harness side).
•  Is there continuity?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common connector between second-row seat warmer control unit terminal J and rear climate control unit terminal T.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which has an open circuit.
•  Go to Step 11.
8
VERIFY IF MALFUNCTION CAUSE IS SECOND-ROW SEAT WARMER UNIT
•  Inspect the second-row seat warmer unit on the side which has a malfunction.
•  Is the second-row seat warmer unit normal?
Yes
Go to the next step.
No
Replace the second-row seat warmer unit (second-row seat) which has a malfunction, then go to Step 11.
(See SECOND-ROW SEAT REMOVAL/INSTALLATION.)
9
DETERMINE IF MALFUNCTION CAUSE IS REAR CLIMATE CONTROL UNIT
•  Inspect the rear climate control unit.
•  Is the rear climate control unit normal?
Yes
Go to the next step.
No
Replace the rear climate control unit, then go to Step 11.
(See REAR CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)
10
DETERMINE IF MALFUNCTION CAUSE IS SECOND-ROW SEAT WARMER CONTROL UNIT
•  Reconnect all the disconnected connectors.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Operate the second-row seat warmer switch to turn on the second-row seat warmer system.
•  Does the second-row seat warmer system operate normally?
Yes
Go to the next step.
No
Replace the second-row seat warmer control unit, then go to the next step.
(See SECOND-ROW SEAT REMOVAL/INSTALLATION.)
11
VERIFY IF MALFUNCTION CAUSE IS CORRECTED
•  Operate the second-row seat warmer switch to turn on the second-row seat warmer system.
•  Does the second-row seat warmer system operate normally?
Yes
Troubleshooting completed. (Explain the contents of the servicing to the customer.)
No
Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
(See SYMPTOM TROUBLESHOOTING [SEAT WARMER SYSTEM].)


Type C VIN:

Description
The second-row seat warmer does not warm up even if the second-row seat warmer switch is turned on.
Possible Causes
•  Second-row seat warmer switch malfunction
•  Second-row seat warmer control unit power supply circuit malfunction
?  Short to ground in wiring harness between R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal O
?  Short to ground in wiring harness between R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal M
?  Open circuit in wiring harness between R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal O
?  Open circuit in wiring harness between R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal M
?  R SEAT WARM 20 A fuse malfunction
?  Short to ground in wiring harness between C/U IG1 15A fuse and second-row seat warmer control unit terminal A
?  Open circuit in wiring harness between C/U IG1 15A fuse and second-row seat warmer control unit terminal A
•  Open circuit in wiring harness between the following terminals:
?  Second-row seat warmer control unit terminal L and body ground
•  Malfunction in wiring harness between second-row seat warmer control unit terminal J and rear climate control unit terminal T
?  Short to ground in wiring harness between second-row seat warmer control unit terminal J and rear climate control unit terminal T
?  Open circuit in wiring harness between second-row seat warmer control unit terminal J and rear climate control unit terminal T
•  Rear climate control unit malfunction
•  Second-row seat warmer unit malfunction
•  Second-row seat warmer control unit malfunction
•  Connector poor contact or terminal damage

Diagnostic procedure

Step

Inspection

Action
1
DETERMINE MALFUNCTION SYMPTOM
•  Operate the second-row seat warmer switches on the driver and passenger sides to turn on the second-row seat warmer system for the driver and passenger sides.
•  Does a malfunction occur with the second-row seat warmer system on both sides?
Yes
Go to Step 8.
No
Go to the next step.
2
INSPECT SECOND-ROW SEAT WARMER CONTROL UNIT CONNECTOR AND SECOND-ROW SEAT WARMER UNIT CONNECTOR
•  Switch the ignition OFF.
•  Disconnect the negative battery terminal.
•  Disconnect the second-row seat warmer control unit connector and the second-row seat warmer unit connector on the side which does not operate.
•  Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 11.
3
VERIFY IF MALFUNCTION CAUSE IS SECOND-ROW SEAT WARMER CONTROL UNIT POWER SUPPLY CIRCUIT
•  Verify that the second-row seat warmer control unit connector is disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (vehicle wiring harness side).
?  Second-row seat warmer control unit terminal O
?  Second-row seat warmer control unit terminal M
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the R SEAT WARM 20 A fuse.
If the fuse is blown:
•  Refer to the wiring diagram and verify if there is a common wiring harness between the following terminals.
?  R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal O
?  R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal M
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
•  Replace the fuse.
If the fuse is damaged:
•  Replace the fuse.
If the fuse is normal:
•  Refer to the wiring diagram and verify if there is a common wiring harness between the following terminals.
?  R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal O
?  R SEAT WARM 20 A fuse and second-row seat warmer control unit terminal M
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 11.
4
VERIFY IF MALFUNCTION CAUSE IS SECOND-ROW SEAT WARMER CONTROL UNIT POWER SUPPLY CIRCUIT
•  Verify that the second-row seat warmer control unit connector is disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (vehicle wiring harness side).
?  Second-row seat warmer control unit terminal A
•  Is the voltage B+?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common wiring harness between the C/U IG1 15A fuse and second-row seat warmer control unit terminal A.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which is shorted to ground.
Go to Step 11.
5
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN SECOND-ROW SEAT WARMER CONTROL UNIT AND BODY GROUND
•  Switch the ignition OFF (LOCK).
•  Verify that the second-row seat warmer control unit connector is disconnected.
•  Inspect for continuity between the following terminals (vehicle wiring harness side) and body ground.
?  Second-row seat warmer control unit terminal L
•  Is there continuity?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common connector between the following terminals and body ground.
?  Second-row seat warmer control unit terminal L
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
•  Go to Step 11.
6
VERIFY IF MALFUNCTION CAUSE IS SHORT CIRCUIT TO GROUND IN WIRING HARNESS BETWEEN SECOND-ROW SEAT WARMER CONTROL UNIT AND REAR CLIMATE CONTROL UNIT
•  Verify that the second-row seat warmer control unit connector is disconnected.
•  Disconnect the rear climate control unit connector.
•  Inspect for continuity between second-row seat warmer control unit terminal J (vehicle wiring harness side) and body ground.
•  Is there continuity?
Yes
•  Refer to the wiring diagram and verify if there is a common connector between second-row seat warmer control unit terminal J and rear climate control unit terminal T.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which is shorted to ground.
•  Go to Step 11.
No
Go to the next step.
7
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN SECOND-ROW SEAT WARMER CONTROL UNIT AND REAR CLIMATE CONTROL UNIT
•  Verify that the second-row seat warmer control unit connector and the rear climate control unit connector are disconnected.
•  Inspect the wiring harness for continuity between second-row seat warmer control unit terminal J and rear climate control unit terminal T (vehicle wiring harness side).
•  Is there continuity?
Yes
Go to the next step.
No
•  Refer to the wiring diagram and verify if there is a common connector between second-row seat warmer control unit terminal J and rear climate control unit terminal T.
If there is a common connector:
?  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
?  Repair or replace the malfunctioning location.
If there is no common connector:
?  Repair or replace the wiring harness which has an open circuit.
•  Go to Step 11.
8
VERIFY IF MALFUNCTION CAUSE IS SECOND-ROW SEAT WARMER UNIT
•  Inspect the second-row seat warmer unit on the side which has a malfunction.
•  Is the second-row seat warmer unit normal?
Yes
Go to the next step.
No
Replace the second-row seat warmer unit (second-row seat) which has a malfunction, then go to Step 11.
(See SECOND-ROW SEAT REMOVAL/INSTALLATION.)
9
DETERMINE IF MALFUNCTION CAUSE IS REAR CLIMATE CONTROL UNIT
•  Inspect the rear climate control unit.
•  Is the rear climate control unit normal?
Yes
Go to the next step.
No
Replace the rear climate control unit, then go to Step 11.
(See REAR CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)
10
DETERMINE IF MALFUNCTION CAUSE IS SECOND-ROW SEAT WARMER CONTROL UNIT
•  Reconnect all the disconnected connectors.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Operate the second-row seat warmer switch to turn on the second-row seat warmer system.
•  Does the second-row seat warmer system operate normally?
Yes
Go to the next step.
No
Replace the second-row seat warmer control unit, then go to the next step.
(See SECOND-ROW SEAT REMOVAL/INSTALLATION.)
11
VERIFY IF MALFUNCTION CAUSE IS CORRECTED
•  Operate the second-row seat warmer switch to turn on the second-row seat warmer system.
•  Does the second-row seat warmer system operate normally?
Yes
Troubleshooting completed. (Explain the contents of the servicing to the customer.)
No
Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
(See SYMPTOM TROUBLESHOOTING [SEAT WARMER SYSTEM].)