Note
• There are two types of front climate control unit, type A and type B.
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DTC B1081:71, B1082:71 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]
id0702k2816500
ac9wzw00005449
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Front Climate Control Unit Type A
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System malfunction location (L.H.D.) |
• B1081:71: Driver-side front air mix actuator motor lock
• B1082:71: Passenger-side front air mix actuator motor lock
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|---|---|
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System malfunction location (R.H.D.) |
• B1081:71: Passenger-side front air mix actuator motor lock
• B1082:71: Driver-side front air mix actuator motor lock
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Detection condition
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• Front air mix actuator motor lock
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Fail-safe function
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Malfunction determined when ignition switched ON
• Front air mix actuator drive signal is stopped right when the malfunction is determined.
Malfunction already exists when ignition switched ON
• Twenty seconds after the ignition is switched ON, the front air mix actuator drive signal is output normally again. Afterwards, motor output is stopped during malfunction determination.
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Possible cause
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• Connector or terminal malfunction
• Front air mix actuator malfunction
• Front A/C unit (front air mix link) malfunction
• Open circuit in wiring harness between front climate control unit and front air mix actuator
• Short circuit to power supply or body ground in wiring harness between front climate control unit and front air mix actuator
• Front climate control unit malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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|---|---|---|---|
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1
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VERIFY RELATED DTC
• Switch the ignition off.
• Perform the DTC inspection for the climate control unit using the M-MDS.
• Is DTC B1C1A:12, B1C1A:13, B1C1B:12, B1C1B:13 or U200D:11 also present?
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Yes
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Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
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No
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Go to the next step.
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2
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INSPECT FRONT AIR MIX ACTUATOR CONNECTOR
• Switch the ignition off.
• Disconnect the negative battery terminal.
• Disconnect the front air mix actuator connector.
• Inspect the connector and terminals (corrosion, damage, pin disconnection).
• Are the connector and terminals normal?
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Yes
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Go to the next step.
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No
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Repair/replace the connector or terminal.
After repair procedure, go to Step 9.
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3
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INSPECT FRONT AIR MIX ACTUATOR
• Inspect the front air mix actuator.
• Is it normal?
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Yes
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Go to the next step.
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No
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Replace the front air mix actuator.
Go to Step 9.
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4
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INSPECT FRONT AIR MIX LINK OPERATION
• Operate the front air mix link manually.
• Does the front air mix link operate smoothly?
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Yes
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Go to the next step.
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No
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Replace the front air mix link.
Go to Step 9.
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5
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INSPECT FRONT AIR MIX ACTUATOR CIRCUIT FOR OPEN CIRCUIT
• Disconnect the front climate control unit connector.
• Inspect for continuity between the following terminals (wiring harness-side):
L.H.D. (Driver-side)
L.H.D. (Passenger-side)
R.H.D. (Driver-side)
R.H.D. (Passenger-side)
• Is there continuity?
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Yes
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Go to the next step.
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No
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Refer to the wiring diagram and verify whether or not there is a common connector between front climate control unit terminal and front air mix actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has an open circuit.
Go to Step 9.
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6
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INSPECT FRONT AIR MIX ACTUATOR CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between the following terminals (wiring harness-side) and body ground:
L.H.D. (Driver-side)
L.H.D. (Passenger-side)
R.H.D. (Driver-side)
R.H.D. (Passenger-side)
• Is there continuity?
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Yes
|
Refer to the wiring diagram and verify whether or not there is a common connector between front climate control unit terminal and front air mix actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to ground.
Go to Step 9.
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No
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Go to the next step.
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7
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INSPECT FRONT AIR MIX ACTUATOR CIRCUIT FOR SHORT TO POWER SUPPLY
• Connect the negative battery terminal.
• Switch the ignition on (engine off or on).
• Measure the voltage at the following terminals (wiring harness-side):
L.H.D. (Driver-side)
L.H.D. (Passenger-side)
R.H.D. (Driver-side)
R.H.D. (Passenger-side)
• Is the voltage 0 V?
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Yes
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Go to the next step.
|
|
No
|
Refer to the wiring diagram and verify whether or not there is a common connector between front climate control unit terminal and front air mix actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to power supply.
Go to Step 9.
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||
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8
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VERIFY FRONT CLIMATE CONTROL UNIT CONNECTOR CONDITION
• Switch the ignition off.
• Disconnect the negative battery terminal.
• Inspect the connector and terminals (corrosion, damage, pin disconnection).
• Are the connector and terminals normal?
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Yes
|
Go to the next step.
|
|
No
|
Repair/replace the connector or terminal.
After repair procedure, go to the next step.
|
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9
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VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN
• Reconnect the disconnected connectors.
• Connect the negative battery terminal.
• Clear the DTC from the climate control unit memory using the M-MDS.
• Perform the DTC inspection for the climate control unit using the M-MDS.
• Is the same DTC displayed?
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Yes
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Repeat the inspection from Step 1.
• If the malfunction recurs, replace the front climate control unit.
Go to the next step.
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No
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Go to the next step.
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10
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VERIFY THAT NO OTHER DTCs ARE PRESENT
• Verify other DTCs displayed.
• Are any other DTCs displayed?
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Yes
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Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
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No
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DTC troubleshooting completed.
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Front Climate Control Unit Type B
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System malfunction location (L.H.D.) |
• B1081:71: Driver-side front air mix actuator motor lock
• B1082:71: Passenger-side front air mix actuator motor lock
|
|---|---|
|
System malfunction location (R.H.D.) |
• B1081:71: Passenger-side front air mix actuator motor lock
• B1082:71: Driver-side front air mix actuator motor lock
|
|
Detection condition
|
• Front air mix actuator motor lock
|
|
Fail-safe function
|
Malfunction determined when ignition switched ON
• Front air mix actuator drive signal is stopped right when the malfunction is determined.
Malfunction already exists when ignition switched ON
• Twenty seconds after the ignition is switched ON, the front air mix actuator drive signal is output normally again. Afterwards, motor output is stopped during malfunction determination.
|
|
Possible cause
|
• Connector or terminal malfunction
• Front air mix actuator malfunction
• Front A/C unit (front air mix link) malfunction
• Open circuit in wiring harness between front climate control unit and front air mix actuator
• Short circuit to power supply or body ground in wiring harness between front climate control unit and front air mix actuator
• Front climate control unit malfunction
|
 |
|
Diagnostic procedure
|
STEP |
INSPECTION |
ACTION |
|
|---|---|---|---|
|
1
|
VERIFY RELATED DTC
• Switch the ignition off.
• Perform the DTC inspection for the climate control unit using the M-MDS.
• Is DTC B1C1A:12, B1C1A:13, B1C1B:12, B1C1B:13 or U200D:11 also present?
|
Yes
|
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
|
|
No
|
Go to the next step.
|
||
|
2
|
INSPECT FRONT AIR MIX ACTUATOR CONNECTOR
• Switch the ignition off.
• Disconnect the negative battery terminal.
• Disconnect the front air mix actuator connector.
• Inspect the connector and terminals (corrosion, damage, pin disconnection).
• Are the connector and terminals normal?
|
Yes
|
Go to the next step.
|
|
No
|
Repair/replace the connector or terminal.
After repair procedure, go to Step 9.
|
||
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3
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INSPECT FRONT AIR MIX ACTUATOR
• Inspect the front air mix actuator.
• Is it normal?
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Yes
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Go to the next step.
|
|
No
|
Replace the front air mix actuator.
Go to Step 9.
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||
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4
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INSPECT FRONT AIR MIX LINK OPERATION
• Operate the front air mix link manually.
• Does the front air mix link operate smoothly?
|
Yes
|
Go to the next step.
|
|
No
|
Replace the front air mix link.
Go to Step 9.
|
||
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5
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INSPECT FRONT AIR MIX ACTUATOR CIRCUIT FOR OPEN CIRCUIT
• Disconnect the front climate control unit connector.
• Inspect for continuity between the following terminals (wiring harness-side):
L.H.D. (Driver-side)
L.H.D. (Passenger-side)
R.H.D. (Driver-side)
R.H.D. (Passenger-side)
• Is there continuity?
|
Yes
|
Go to the next step.
|
|
No
|
Refer to the wiring diagram and verify whether or not there is a common connector between front climate control unit terminal and front air mix actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has an open circuit.
Go to Step 9.
|
||
|
6
|
INSPECT FRONT AIR MIX ACTUATOR CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between the following terminals (wiring harness-side) and body ground:
L.H.D. (Driver-side)
L.H.D. (Passenger-side)
R.H.D. (Driver-side)
R.H.D. (Passenger-side)
• Is there continuity?
|
Yes
|
Refer to the wiring diagram and verify whether or not there is a common connector between front climate control unit terminal and front air mix actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to ground.
Go to Step 9.
|
|
No
|
Go to the next step.
|
||
|
7
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INSPECT FRONT AIR MIX ACTUATOR CIRCUIT FOR SHORT TO POWER SUPPLY
• Connect the negative battery terminal.
• Switch the ignition on (engine off or on).
• Measure the voltage at the following terminals (wiring harness-side):
L.H.D. (Driver-side)
L.H.D. (Passenger-side)
R.H.D. (Driver-side)
R.H.D. (Passenger-side)
• Is the voltage 0 V?
|
Yes
|
Go to the next step.
|
|
No
|
Refer to the wiring diagram and verify whether or not there is a common connector between front climate control unit terminal and front air mix actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to power supply.
Go to Step 9.
|
||
|
8
|
VERIFY FRONT CLIMATE CONTROL UNIT CONNECTOR CONDITION
• Switch the ignition off.
• Disconnect the negative battery terminal.
• Inspect the connector and terminals (corrosion, damage, pin disconnection).
• Are the connector and terminals normal?
|
Yes
|
Go to the next step.
|
|
No
|
Repair/replace the connector or terminal.
After repair procedure, go to the next step.
|
||
|
9
|
VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN
• Reconnect the disconnected connectors.
• Connect the negative battery terminal.
• Clear the DTC from the climate control unit memory using the M-MDS.
• Perform the DTC inspection for the climate control unit using the M-MDS.
• Is the same DTC displayed?
|
Yes
|
Repeat the inspection from Step 1.
• If the malfunction recurs, replace the front climate control unit.
Go to the next step.
|
|
No
|
Go to the next step.
|
||
|
10
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VERIFY THAT NO OTHER DTCs ARE PRESENT
• Verify other DTCs displayed.
• Are any other DTCs displayed?
|
Yes
|
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
|
|
No
|
DTC troubleshooting completed.
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