One Or More Power Seat Motors Do Not Operate

SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Seat Position Memory System): One or more Power Seat Motors do not Operate
- One or more Power Seat Motors do not Operate

DESCRIPTION

When the power seat control switch is operated, a command signal is sent to the position control ECU. The position control ECU then controls the appropriate seat motor as needed. This memory system does not use a seat position sensor. The seat position is detected by counting pulses that are output when the motor turns. If there is no pulse output from the motor, the motor will stop operating. The position control ECU is designed so that a malfunction of the seat memory system will not interfere with manual seat control.

WIRING DIAGRAM









INSPECTION PROCEDURE

PROCEDURE

1. CHECK FRONT POWER SEAT OPERATION

(a) Check that each function of the power seat operates normally by using the front power seat switches.

Result





B -- INSPECT LUMBAR FRONT POWER SEAT SWITCH
A -- Continue to next step.

2. READ VALUE USING TECHSTREAM (FRONT POWER SEAT SWITCH)

(a) Check the DATA LIST for proper functioning of the front power seat switch.

Position control ECU and switch LH, RH





OK:

On tester screen, each item changes between ON and OFF according to above chart.

NG -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Removal
OK -- Continue to next step.

3. PERFORM ACTIVE TEST USING TECHSTREAM (POWER SEAT MOTOR)

(a) Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the power seat motors operate.

Position control ECU and switch (for driver, front passenger side)





OK:

The power seat motors operate normally.

Result





C -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Removal

B -- INSPECT FRONT SEAT FRAME WITH ADJUSTER RH [SLIDE MOTOR, FRONT VERTICAL MOTOR, LIFTER MOTOR, RECLINING MOTOR] (for Front Passenger Side)
A -- Continue to next step.

4. INSPECT FRONT SEAT FRAME WITH ADJUSTER LH [SLIDE MOTOR, FRONT VERTICAL MOTOR, LIFTER MOTOR, RECLINING MOTOR] (for Driver Side)

(a) Remove the front seat adjuster LH.

(b) Check operation of the slide motor.





(1) Check if the seat adjuster moves smoothly when the battery is connected to the slide motor connector terminals.

OK:





(c) Check operation of the front vertical motor.





(1) Check if the seat adjuster moves smoothly when the battery is connected to the front vertical motor connector terminals.

OK:





(d) Check operation of the lifter motor.





(1) Check if the seat adjuster moves smoothly when the battery is connected to the lifter motor connector terminals.

OK:





(e) Check operation of the reclining motor.





(1) Check if the seat adjuster moves smoothly when the battery is connected to the reclining motor connector terminals.

OK:





OK -- CHECK WIRE HARNESS (POSITION CONTROL ECU AND SWITCH - POWER SEAT MOTOR AND BODY GROUND)

NG -- REPLACE FRONT SEAT ASSEMBLY LH Removal

5. INSPECT FRONT SEAT FRAME WITH ADJUSTER RH [SLIDE MOTOR, FRONT VERTICAL MOTOR, LIFTER MOTOR, RECLINING MOTOR] (for Front Passenger Side)

(a) Remove the front seat adjuster RH.

(b) Check operation of the slide motor.





(1) Check if the seat adjuster moves smoothly when the battery is connected to the slide motor connector terminals.

OK:





(c) Check operation of the front vertical motor.





(1) Check if the seat adjuster moves smoothly when the battery is connected to the front vertical motor connector terminals.

OK:





(d) Check operation of the lifter motor.





(1) Check if the seat adjuster moves smoothly when the battery is connected to the lifter motor connector terminals.

OK:





(e) Check operation of the reclining motor.





(1) Check if the seat adjuster moves smoothly when the battery is connected to the reclining motor connector terminals.

OK:





NG -- REPLACE FRONT SEAT ASSEMBLY RH Removal
OK -- Continue to next step.

6. CHECK WIRE HARNESS (POSITION CONTROL ECU AND SWITCH - POWER SEAT MOTOR AND BODY GROUND)





(a) Disconnect the b8*1 or a6*2 switch connector.

(b) Disconnect the b3*1, b4*1, b10*1, b15*1, a1*2, a4*2, a10*2 or a15*2 motor connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:

for driver side
for front passenger side










NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Removal

7. INSPECT LUMBAR FRONT POWER SEAT SWITCH





(a) Remove the switch.

(b) Measure the resistance between the terminals when the switch is operated.

Standard resistance:

for driver side
for front passenger side










NG -- REPLACE LUMBAR FRONT POWER SEAT SWITCH Removal
OK -- Continue to next step.

8. INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY





(a) Remove the lumbar support adjuster.

(b) Check operation of the lumbar support adjuster.

(1) Check that the lumbar support adjuster moves smoothly when the battery is connected to the lumbar support adjuster motor connector terminals.

OK:





NG -- REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY Removal
OK -- Continue to next step.

9. CHECK WIRE HARNESS (LUMBAR FRONT POWER SEAT SWITCH - BATTERY AND BODY GROUND)





(a) Disconnect the b6 or a8 switch connector.

(b) Measure the voltage of the wire harness side connector.

Standard voltage:

for driver side
for front passenger side










(c) Measure the resistance of the wire harness side connectors.

Standard resistance:

for driver side
for front passenger side










NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (LUMBAR FRONT POWER SEAT SWITCH - LUMBAR SUPPORT ADJUSTER)