Inspection Procedure
- INSPECT LUMBAR SUPPORT SWITCH
- Remove the lumbar support switch.
- Measure the resistance.
Standard:
Upper side control
TESTER CONNECTION AND SPECIFIED CONDITIONTester Connection Switch Condition Specified Condition 5 (B) - 1 (H) HOLD Below 1 Ω 4 (R) - 6 (E) HOLD Below 1 Ω 1 (H) - 6 (E) OFF Below 1 Ω 4 (R) - 6 (E) OFF Below 1 Ω 1 (H) - 6 (E) RELEASE Below 1 Ω 4 (R) - 5 (B) RELEASE Below 1 Ω Lower side control
TESTER CONNECTION AND SPECIFIED CONDITIONTester Connection Switch Condition Specified Condition 2 (H1) - 5 (B) HOLD Below 1 Ω 3 (R1) - 6 (E) HOLD Below 1 Ω 2 (H1) - 6 (E) OFF Below 1 Ω 3 (R1) - 6 (E) OFF Below 1 Ω 2 (H1) - 6 (E) RELEASE Below 1 Ω 3 (R1) - 5 (B) RELEASE Below 1 Ω Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE LUMBAR SUPPORT SWITCH
OK: GO TO NEXT STEP
- INSPECT POWER SEAT MOTOR (SEE INSPECTION
)
NG: REPLACE POWER SEAT MOTOR
OK: GO TO NEXT STEP
- CHECK WIRE HARNESS (LUMBAR SUPPORT SWITCH - POWER SEAT MOTOR AND BODY GROUND)
- Disconnect the P23 switch, connector.
- Disconnect the P30 and P31 motor connectors.
- Measure the resistance and voltage of the wire harness side connectors.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITIONTester connection Specified condition P23-1 (H) - P31-1 Below 1 Ω P23-4 (R) - P31-2 Below 1 Ω P23-2 (H1) - P30-2 Below 1 Ω P23-3 (R1) - P30-1 Below 1 Ω P23-6 (E) - Body ground Below 1 Ω P23-5 (B) - P23-6 (E) 10 to 14 V Fig 2: Identifying P23 Lumbar Support Switch Connector Terminals And P30,P31 Power Seat Motor Connector TerminalsCourtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR AND REPLACE HARNESS AND CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE