DTC B1B91:13 [POSITION MEMORY CONTROL MODULE]

id0902o7998800

L.H.D.

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 4 times that current flowing to the tilt motor exceeds 1 A.

•  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:

―  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

•  Short to power supply in wiring harness between the following terminals:

―  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

•  Open circuit in wiring harness between the following terminals:

―  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

•  Front seat cushion frame/adjuster unit malfunction

―  Tilt motor and position sensor malfunction

•  Position memory control module malfunction

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 4 times that current flowing to the tilt motor exceeds 1 A. • 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: ― 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 • Short to power supply in wiring harness between the following terminals: ― 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 • Open circuit in wiring harness between the following terminals: ― 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 • Front seat cushion frame/adjuster unit 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. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • 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.
1		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.
2		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: • 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 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.
3		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. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • 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.
4		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • 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 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. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • 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): ― 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 • Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • 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 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. (See TILT MOTOR INSPECTION.) • Is the tilt motor normal?	Yes	Go to the next step.
6		No	Replace the front seat cushion frame/adjuster unit, then go to Step 9. (See FRONT SEAT CUSHION FRAME/ADJUSTER UNIT REMOVAL/INSTALLATION.)
7	INSPECT POSITION MEMORY CONTROL MODULE • Inspect the position memory control module. (See POSITION MEMORY CONTROL MODULE INSPECTION.) • Is the position memory control module normal?	Yes	Go to the next step.
7		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. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the position memory control module using the M-MDS. (See CLEARING DTC [POSITION MEMORY CONTROL MODULE].) • 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. (See DTC INSPECTION [POSITION MEMORY CONTROL MODULE].) • Is the same Pending DTC present?	Yes	Replace the front seat cushion frame/adjuster unit, then go to the next step. (See FRONT SEAT CUSHION FRAME/ADJUSTER UNIT REMOVAL/INSTALLATION.)
8		No	Go to Step 10.
9	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the position memory control module using the M-MDS. (See CLEARING DTC [POSITION MEMORY CONTROL MODULE].) • 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. (See DTC INSPECTION [POSITION MEMORY CONTROL MODULE].) • Is the same Pending DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the position memory control module. (See POSITION MEMORY CONTROL MODULE REMOVAL/INSTALLATION.) Go to the next step.
9		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].)
10		No	DTC troubleshooting completed.

R.H.D.

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 4 times that current flowing to the tilt motor exceeds 1 A.

•  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:

―  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:

―  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:

―  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 cushion frame/adjuster unit malfunction

―  Tilt motor and position sensor malfunction

•  Position memory control module malfunction

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 4 times that current flowing to the tilt motor exceeds 1 A. • 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: ― 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: ― 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: ― 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 cushion frame/adjuster unit 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. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • 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.
1		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.
2		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 B ― Tilt motor and position sensor terminal D ― 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: • 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.
3		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. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Switch the ignition ON (engine off or on). • Measure the voltage at the following terminals (wiring harness-side): ― Tilt motor and position sensor terminal B ― Tilt motor and position sensor terminal D ― 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.
4		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • 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. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • 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): ― 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.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • 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. (See TILT MOTOR INSPECTION.) • Is the tilt motor normal?	Yes	Go to the next step.
6		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. (See POSITION MEMORY CONTROL MODULE INSPECTION.) • Is the position memory control module normal?	Yes	Go to the next step.
7		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. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the position memory control module using the M-MDS. (See CLEARING DTC [POSITION MEMORY CONTROL MODULE].) • 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. (See DTC INSPECTION [POSITION MEMORY CONTROL MODULE].) • Is the same Pending DTC present?	Yes	Replace the front seat, then go to the next step. (See FRONT SEAT REMOVAL/INSTALLATION.)
8		No	Go to Step 10.
9	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the position memory control module using the M-MDS. (See CLEARING DTC [POSITION MEMORY CONTROL MODULE].) • 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. (See DTC INSPECTION [POSITION MEMORY CONTROL MODULE].) • Is the same Pending DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the position memory control module. (See POSITION MEMORY CONTROL MODULE REMOVAL/INSTALLATION.) Go to the next step.
9		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].)
10		No	DTC troubleshooting completed.