Front Power Seat Does Not Operate With Front Power Seat Switch

SEAT: FRONT POWER SEAT CONTROL SYSTEM: Front Power Seat does not Operate with Front Power Seat Switch
- Front Power Seat does not Operate with Front Power Seat Switch

DESCRIPTION

Signals of the front power switch are monitored by the position control ECU. The ECU then activates the driver and front passenger side motors.

INSEPCTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (D P/SEAT, P P/SEAT, MPX-IG, MPX-B1, D/C CUT, AM1)

(a) Remove the D P/SEAT MPX-IG and AM1 fuses from the driver side junction block.

(b) Remove the P P/SEAT and MPX-B1 fuses from the front passenger side junction block.

(c) Remove the D/C CUT fuse from the engine room No. 1 relay block.

(d) Measure the resistance of the fuses.

Standard resistance:

Below 1 Ohms

NG -- REPLACE FUSE
OK -- Continue to next step.

2. INSPECT IGNITION RELAY NO. 1

(a) Remove the IG1 relay from the driver side junction block.

(b) Measure the resistance of the relay.

Standard resistance:

NG -- REPLACE IGNITION RELAY NO. 1
OK -- Continue to next step.

3. CHECK FRONT POWER SEAT CONTROL FUNCTION

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

Result:

B -- CHECK WIRE HARNESS (LUMBAR FRONT POWER SEAT SWITCH - POSITION CONTROL ECU AND BODY GROUND)
A -- Continue to next step.

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

(a) Check the Data List for proper functioning of the front power seat switch.

Driver Seat, Passenger Seat

OK:

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

NG -- INSPECT POWER SEAT MOTOR ASSEMBLY (SLIDE MOTOR, VERTICAL MOTOR, LIFTER MOTOR, RECLINING MOTOR)

OK -- REPLACE POSITION CONTROL ECU

5. INSPECT FRONT POWER SEAT SWITCH (SLIDE SWITCH, FRONT VERTICAL SWITCH, LIFTER SWITCH, RECLINING SWITCH)

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

(1) Front power seat switch LH

Standard resistance:

Slide switch
Front vertical switch
Lifter switch
Reclining switch

(2) Front power seat switch RH

Standard resistance:

Slide switch
Front vertical switch
Lifter switch
Reclining switch

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

6. INSPECT POWER SEAT MOTOR ASSEMBLY (SLIDE MOTOR, VERTICAL MOTOR, LIFTER MOTOR, RECLINING MOTOR)

(a) Check the operation of the slide motor.

(1) Check the motor rotation when the battery is connected to the slide motor connector terminals.

OK:

(b) Check the operation of the vertical motor.

(1) Check the motor rotation when the battery is connected to the vertical motor connector terminals.

OK:

(1) Check the motor rotation when the battery is connected to the lifter motor connector terminals.

OK:

(d) Check the operation of the reclining motor.

(1) Check the motor rotation when the battery is connected to the reclining motor connector terminals.

OK:

NG -- REPLACE POWER SEAT MOTOR ASSEMBLY
OK -- Continue to next step.

7. CHECK WIRE HARNESS (POSITION CONTROL ECU LH - BATTERY AND BODY GROUND)

(a) Disconnect the P21, P22, P23 or P24 ECU connectors.

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

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 -- REPLACE POSITION CONTROL ECU

8. CHECK WIRE HARNESS (LUMBAR FRONT POWER SEAT SWITCH - POSITION CONTROL ECU AND BODY GROUND)

(a) Disconnect the L27 or L28 switch connector.

(b) Disconnect the P22 or P24 ECU 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 -- Continue to next step.

9. INSPECT LUMBAR FRONT POWER SEAT SWITCH

(a) Remove the switch.

(b) Measure the resistance of the seat switch.

Standard resistance:

for Driver Side
for Front Passenger Side

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

10. CHECK POWER SEAT MOTOR ASSEMBLY (LUMBAR SUPPORT ADJUSTER MOTOR)

(a) Check the operation of the lumbar support adjuster motor.

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

OK:

NG -- REPLACE POWER SEAT MOTOR ASSEMBLY

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR