DTC B1B91:13 [POSITION MEMORY CONTROL MODULE]

id0902o7998800

Description

Tilt motor and position sensor circuit malfunction
Detection condition
•  Position memory control module detects the following conditions during the tilt motor operation control:
?  Detects 4 times that current flowing to the tilt motor is less than 1 A.
?  Detects for 0.2 s that there is no change in the tilt sensor pulse.
•  Position memory control module detects any of the following conditions during the tilt motor not operation control:
?  Detects 4 times that current flowing to the tilt motor exceeds 10 A.
?  Detects 4 times that current flowing to the tilt motor exceeds 1 A and a change in the tilt sensor pulse 5 timeswithin 1 s.
•  Position memory control module detects for 5 s that there is no change in the tilt sensor pulse during the tilt motor operation control.
Fail-safe
•  Memory clearing:
?  If there is a malfunction in the tilt position sensor, clear all the memory positions.
•  Memory seat positioning using position memory switch and remote transmitter:
?  If there is a malfunction in the tilt position sensor, inhibits all memory seat positioning.
?  If there is a malfunction in the tilt motor, inhibits tilt motor seat positioning.
•  Tilt motor seat positioning using power seat switch:
?  If there is a malfunction in the tilt motor, inhibits tilt motor seat positioning.
•  Memory registration using position memory switch and remote transmitter:
?  If there is a malfunction in the tilt position sensor, inhibits the memory registration.
?  If there is a malfunction in the tilt motor and the malfunction is caused by short circuit, inhibits the memory registration.
Possible cause
•  Tilt motor and position sensor connector or terminal malfunction
•  Position memory control module connector or terminal malfunction
•  Short to ground in wiring harness between the following terminals:
?  L.H.D.:
•  Position memory control module terminal 3C—Tilt motor and position sensor terminal D
•  Position memory control module terminal 3D—Tilt motor and position sensor terminal B
•  Position memory control module terminal 3K—Tilt motor and position sensor terminal F
•  Position memory control module terminal 3L—Tilt motor and position sensor terminal H
?  R.H.D.:
•  Position memory control module terminal 3C—Tilt motor and position sensor terminal B
•  Position memory control module terminal 3D—Tilt motor and position sensor terminal D
•  Position memory control module terminal 3K—Tilt motor and position sensor terminal F
•  Position memory control module terminal 3L—Tilt motor and position sensor terminal H
•  Short to power supply in wiring harness between the following terminals:
?  L.H.D.:
•  Position memory control module terminal 3C—Tilt motor and position sensor terminal D
•  Position memory control module terminal 3D—Tilt motor and position sensor terminal B
•  Position memory control module terminal 3K—Tilt motor and position sensor terminal F
•  Position memory control module terminal 3L—Tilt motor and position sensor terminal H
?  R.H.D.:
•  Position memory control module terminal 3C—Tilt motor and position sensor terminal B
•  Position memory control module terminal 3D—Tilt motor and position sensor terminal D
•  Position memory control module terminal 3K—Tilt motor and position sensor terminal F
•  Position memory control module terminal 3L—Tilt motor and position sensor terminal H
•  Open circuit in wiring harness between the following terminals:
?  L.H.D.:
•  Position memory control module terminal 3C—Tilt motor and position sensor terminal D
•  Position memory control module terminal 3D—Tilt motor and position sensor terminal B
•  Position memory control module terminal 3K—Tilt motor and position sensor terminal F
•  Position memory control module terminal 3L—Tilt motor and position sensor terminal H
?  R.H.D.:
•  Position memory control module terminal 3C—Tilt motor and position sensor terminal B
•  Position memory control module terminal 3D—Tilt motor and position sensor terminal D
•  Position memory control module terminal 3K—Tilt motor and position sensor terminal F
•  Position memory control module terminal 3L—Tilt motor and position sensor terminal H
•  Front seat malfunction
?  Tilt motor and position sensor malfunction
•  Position memory control module malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT TILT MOTOR AND POSITION SENSOR CONNECTOR
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Disconnect the tilt motor and position sensor connector.
•  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 9.
2
INSPECT POSITION MEMORY CONTROL MODULE CONNECTOR
•  Disconnect the position memory control module connector.
•  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 9.
3
INSPECT TILT MOTOR AND POSITION SENSOR CIRCUIT FOR SHORT TO GROUND
•  Verify that the tilt motor and position sensor and position memory control module connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
?  Tilt motor and position sensor terminal D
?  Tilt motor and position sensor terminal B
?  Tilt motor and position sensor terminal F
?  Tilt motor and position sensor terminal H
•  Is there continuity?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  L.H.D.:
?  Position memory control module terminal 3C—Tilt motor and position sensor terminal D
?  Position memory control module terminal 3D—Tilt motor and position sensor terminal B
?  Position memory control module terminal 3K—Tilt motor and position sensor terminal F
?  Position memory control module terminal 3L—Tilt motor and position sensor terminal H
•  R.H.D.:
?  Position memory control module terminal 3C—Tilt motor and position sensor terminal B
?  Position memory control module terminal 3D—Tilt motor and position sensor terminal D
?  Position memory control module terminal 3K—Tilt motor and position sensor terminal F
?  Position memory control module terminal 3L—Tilt motor and position sensor terminal H
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.
4
INSPECT TILT MOTOR AND POSITION SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the tilt motor and position sensor and position memory control module connectors are disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
?  Tilt motor and position sensor terminal D
?  Tilt motor and position sensor terminal B
?  Tilt motor and position sensor terminal F
?  Tilt motor and position sensor terminal H
•  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 the following terminals:
•  L.H.D.:
?  Position memory control module terminal 3C—Tilt motor and position sensor terminal D
?  Position memory control module terminal 3D—Tilt motor and position sensor terminal B
?  Position memory control module terminal 3K—Tilt motor and position sensor terminal F
?  Position memory control module terminal 3L—Tilt motor and position sensor terminal H
•  R.H.D.:
?  Position memory control module terminal 3C—Tilt motor and position sensor terminal B
?  Position memory control module terminal 3D—Tilt motor and position sensor terminal D
?  Position memory control module terminal 3K—Tilt motor and position sensor terminal F
?  Position memory control module terminal 3L—Tilt motor and position sensor terminal H
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.
5
INSPECT TILT MOTOR AND POSITION SENSOR CIRCUIT FOR OPEN CIRCUIT
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Verify that the tilt motor and position sensor and position memory control module connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
?  L.H.D.:
•  Position memory control module terminal 3C—Tilt motor and position sensor terminal D
•  Position memory control module terminal 3D—Tilt motor and position sensor terminal B
•  Position memory control module terminal 3K—Tilt motor and position sensor terminal F
•  Position memory control module terminal 3L—Tilt motor and position sensor terminal H
?  R.H.D.:
•  Position memory control module terminal 3C—Tilt motor and position sensor terminal B
•  Position memory control module terminal 3D—Tilt motor and position sensor terminal D
•  Position memory control module terminal 3K—Tilt motor and position sensor terminal F
•  Position memory control module terminal 3L—Tilt motor and position sensor terminal H
•  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 the following terminals:
•  L.H.D.:
?  Position memory control module terminal 3C—Tilt motor and position sensor terminal D
?  Position memory control module terminal 3D—Tilt motor and position sensor terminal B
?  Position memory control module terminal 3K—Tilt motor and position sensor terminal F
?  Position memory control module terminal 3L—Tilt motor and position sensor terminal H
•  R.H.D.:
?  Position memory control module terminal 3C—Tilt motor and position sensor terminal B
?  Position memory control module terminal 3D—Tilt motor and position sensor terminal D
?  Position memory control module terminal 3K—Tilt motor and position sensor terminal F
?  Position memory control module terminal 3L—Tilt motor and position sensor terminal H
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 TILT MOTOR
•  Inspect the tilt motor.
•  Is the tilt motor normal?
Yes
Go to the next step.
No
Replace the front seat, then go to Step 9.
(See FRONT SEAT REMOVAL/INSTALLATION.)
7
INSPECT POSITION MEMORY CONTROL MODULE
•  Inspect the position memory control module.
•  Is the position memory control module normal?
Yes
Go to the next step.
No
Replace the position memory control module, then go to Step 9.
(See POSITION MEMORY CONTROL MODULE REMOVAL/INSTALLATION.)
8
VERIFY IF MALFUNCTIONING LOCATION IS TILT POSITION SENSOR DEPENDING ON REPEATABILITY
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
•  Clear the DTC for the position memory control module using the M-MDS.
•  Operate the tilt switch of the driver's side power seat switch for 5 s or more.
•  Retrieve the position memory control module DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Replace the front seat, then go to the next step.
(See FRONT SEAT REMOVAL/INSTALLATION.)
No
Go to Step 10.
9
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
•  Clear the DTC for the position memory control module using the M-MDS.
•  Operate the tilt switch of the driver's side power seat switch for 5 s or more.
•  Retrieve the position memory control module DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the position memory control module.
Go to the next step.
No
Go to the next step.
10
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [POSITION MEMORY CONTROL MODULE].)
No
DTC troubleshooting completed.