Front Power Seat Does Not Operate With Front Power Seat Switch

SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Memory): Front Power Seat does not Operate with Front Power Seat Switch

Front Power Seat does not Operate with Front Power Seat Switch

DESCRIPTION

When the front power seat switch is operated, a signal is sent to the front seat adjuster, which then operates each motor. When 2 or more signals are input to the front seat adjuster, the motors only operate when the signals are from the slide switch and reclining switch.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK SEAT OPERATION
(a) Operate the power seat switch and check that the front power seat operates.

Result

E -- INSPECT FUSE (FR P/SEAT RH)
D -- INSPECT FUSE (FR P/SEAT RH)
C -- INSPECT FUSE (FR P/SEAT LH)
B -- INSPECT FUSE (FR P/SEAT LH)
A -- Continue to next step.
2. INSPECT FUSE (ECU-B1, ECU-IG No. 1, FR P/SEAT)
(a) Remove the ECU-B1 fuse from the engine room relay block.
(b) Remove the FR P/SEAT LH and ECU-IG No. 1 fuses from the main body ECU.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE FUSE
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - BATTERY AND BODY GROUND)

(a) Disconnect the Z9 and Z10 switch connectors.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT FRONT SEAT ADJUSTER ASSEMBLY LH

(a) Disconnect the Z9 switch connector.
(b) Apply battery voltage and check the operation of the power seat.
OK:

NG -- CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - POSITION MOTOR)
OK -- REPLACE FRONT POWER SEAT SWITCH LH
5. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - POSITION MOTOR)

(a) Disconnect the Z9 switch connector.
(b) Disconnect the Z3, Z4, Z5 and Z6 motor connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE FRONT SEAT ADJUSTER ASSEMBLY LH
6. INSPECT FUSE (FR P/SEAT LH)
(a) Remove the FR P/SEAT LH fuse from the main body ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

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

(a) Remove the switch Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE FRONT POWER SEAT LUMBAR SWITCH
OK -- Continue to next step.
8. INSPECT FRONT SEAT ADJUSTER ASSEMBLY LH

(a) Disconnect the Z2 switch connector.
(b) Apply battery voltage and check the operation of the power seat.
OK:

NG -- CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT LUMBAR SWITCH - LUMBAR SUPPORT MOTOR LH)
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT POWER SEAT LUMBAR SWITCH - BATTERY AND BODY GROUND)
9. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT LUMBAR SWITCH - LUMBAR SUPPORT MOTOR LH)

(a) Disconnect the Z2 switch connector.
(b) Disconnect the Z7 motor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE FRONT SEAT ADJUSTER ASSEMBLY LH
10. INSPECT FUSE (FR P/SEAT LH)
(a) Remove the FR P/SEAT LH fuse from the main body ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE FUSE
OK -- Continue to next step.
11. INSPECT LEG SUPPORT ADJUSTMENT SWITCH

(a) Remove the switch Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE LEG SUPPORT ADJUSTMENT SWITCH
OK -- Continue to next step.
12. INSPECT FRONT SEAT ADJUSTER ASSEMBLY LH

(a) Disconnect the U1 switch connector.
(b) Apply battery voltage and check the operation of the power seat.
OK:

NG -- CHECK HARNESS AND CONNECTOR (LEG SUPPORT ADJUSTMENT SWITCH - LEG SUPPORT MOTOR LH)
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (LEG SUPPORT ADJUSTMENT SWITCH - BATTERY AND BODY GROUND)
13. CHECK HARNESS AND CONNECTOR (LEG SUPPORT ADJUSTMENT SWITCH - LEG SUPPORT MOTOR LH)

(a) Disconnect the U1 switch connector.
(b) Disconnect the Z8 motor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE FRONT SEAT ADJUSTER ASSEMBLY LH
14. INSPECT FUSE (FR P/SEAT RH)
(a) Remove the FR P/SEAT RH fuse from the main body ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE FUSE
OK -- Continue to next step.
15. INSPECT FRONT POWER SEAT SWITCH RH

(a) Remove the switch Removal
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

Slide switch

Reclining switch

NG -- REPLACE FRONT POWER SEAT SWITCH RH
OK -- Continue to next step.
16. INSPECT FRONT SEAT ADJUSTER ASSEMBLY RH

(a) Disconnect the Y9 switch connector.
(b) Apply battery voltage and check the operation of the power seat.
OK:

NG -- CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - POSITION MOTOR)
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT POWER SEAT SWITCH RH - BATTERY AND BODY GROUND)
17. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - POSITION MOTOR)

(a) Disconnect the Y9 switch connector.
(b) Disconnect the Y12 and Y13 motor connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH
18. INSPECT FUSE (FR P/SEAT RH)
(a) Remove the FR P/SEAT RH fuse from the main body ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

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

(a) Remove the switch Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE FRONT POWER SEAT LUMBAR SWITCH
OK -- Continue to next step.
20. INSPECT FRONT SEAT ADJUSTER ASSEMBLY RH

(a) Disconnect the Y10 switch connector.
(b) Apply battery voltage and check the operation of the power seat.
OK:

NG -- CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT LUMBAR SWITCH - LUMBAR SUPPORT MOTOR RH)
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT POWER SEAT LUMBAR SWITCH - BATTERY AND BODY GROUND)
21. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT LUMBAR SWITCH - LUMBAR SUPPORT MOTOR RH)

(a) Disconnect the Y10 switch connector.
(b) Disconnect the Y11 motor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH