All Functions Do Not Operate

Wiring diagram:

Power seat system Ref. to WIRING SYSTEM>POWER SEAT SYSTEM>WIRING DIAGRAM .

CHECK SEAT FUNCTIONS .
Operate each power seat switch and check that each power seat function operates normally.

Does all function fail to operate?

Yes: GO TO 2.

No: Check the motor which does not operate. Ref. to SEATS>POWER SEAT SYSTEM>INSPECTION>A PART OF FUNCTION DOES NOT OPERATE .
CHECK FUSE .
1. Turn the ignition switch to OFF.
2. Check the power seat fuse inside the fuse box. Ref. to SEATS>RELAY AND FUSE>INSPECTION>CHECK FUSE .
Is the fuse blown out?

Yes: Replace the appropriate fuse.

No: GO TO 3.
CHECK CIRCUIT BREAKER .
1. Remove the circuit breaker. Ref. to SEATS>RELAY AND FUSE>REMOVAL>CIRCUIT BREAKER .
2. Check the circuit breaker. Ref. to SEATS>RELAY AND FUSE>INSPECTION>CHECK CIRCUIT BREAKER .
Is the circuit breaker normal?

Yes: GO TO 4.

No: Replace the circuit breaker.
CHECK POWER SUPPLY CIRCUIT .
1. Disconnect the power seat connector.
2. Measure the voltage between harness connector and chassis ground.
  Connector & terminal
  
  (L57) No. 1 (+) - Chassis ground (-):
Is the voltage 10 V or more?

Yes: GO TO 5.

No: Repair or replace the defective part.
CHECK GROUND CIRCUIT .
Measure the resistance between power seat harness connector and chassis ground.

Connector & terminal

(L57) No. 4 - Chassis ground:

Is the resistance less than 1 Ω?

Yes GO TO 6

No: Repair or replace the defective part.
CHECK HARNESS .
Measure the resistance between power seat harness connectors.

Connector & terminal

(St2) No. 1 - (St134) No. 7:

(St2) No. 1 - (St134) No. 2:

(St2) No. 4 - (St134) No. 14:

(St2) No. 4 - (St134) No. 9:

(St164) No. 7 - (St52) No. 17:

(St164) No. 2 - (St52) No. 16:

(St164) No. 14 - (St52) No. 11:

(St164) No. 9 - (St52) No. 13:

Is the resistance less than 1 Ω?

Yes: Replace the power seat switch assembly. Ref. to SEATS>POWER SEAT .

No: Repair or replace the defective part.