Pinpoint Test W: The Power Lumbar Is Inoperative - Right Rear Seat

Seats

Pinpoint Test W: The Power Lumbar is Inoperative - Right Rear Seat

Refer to Wiring Diagram Set 120, Power Seats for schematic and connector information. Diagrams By Number

Normal Operation

When the lumbar button (part of seat control switch) is pressed, voltage and ground are supplied to the power lumbar motor to move the lumbar mechanism in or out.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Lumbar control switch
- Lumbar motor

PINPOINT TEST W: THE POWER LUMBAR IS INOPERATIVE - RIGHT REAR SEAT

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W1 CHECK FOR VOLTAGE TO THE LUMBAR MOTOR

- Disconnect: RH Rear Power Lumbar Motor C3231.
- Measure voltage between power lumbar motor C3231-B, circuit CPS68 (GN/OG), harness side and power lumbar motor C3231-A, circuit CPS67 (BN/BU), harness side.




- Operate the seat control switch in both directions.
- Is the voltage greater than 10 volts in both directions?

Yes
INSTALL a new power lumbar assembly. REFER to Lumbar Assembly - Second Row Lumbar Assembly - Second Row. TEST the system for normal operation.

No
GO to W2.

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W2 CHECK THE LUMBAR MOTOR CIRCUITS FOR AN OPEN

- Disconnect: RH Rear Lumbar Control Switch C3357.
- Measure the resistance between:
- lumbar control switch C3357-3, circuit CPS68 (GN/OG), harness side and power lumbar motor C3231-B, circuit CPS68 (GN/OG), harness side.
- lumbar control switch C3357-7, circuit CPS67 (BN/BU), harness side and power lumbar motor C3231-A, circuit CPS67 (BN/BU), harness side.




- Are the resistances less than 5 ohms?

Yes
INSTALL a new seat control switch. REFER to Lumbar Control Switch - Second Row Lumbar Control Switch - Second Row. TEST the system for normal operation.

No
REPAIR the circuit(s). TEST the system for normal operation.

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