Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Lumbar Support Switch Circuit
Inspect the appropriate lumbar support switch (driver or passenger) circuit. See appropriate POWER SEATS under SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Disconnect the switch connector and connect the seat wiring harness to the floor wiring harness. Inspect the connector on the wiring harness side. See INSPECTING LUMBAR SUPPORT SWITCH CIRCUIT table. See CONNECTOR IDENTIFICATION . If the circuit is not as specified, inspect the circuits connected to other parts.
| Tester Connection | Condition | Specified Condition | |
|---|---|---|---|
| Driver Seat | |||
| 3 - Ground | Constant | Continuity | |
| 4 - Ground | Constant | B+ Voltage | |
| Passenger Seat | |||
| 2 - Ground | Constant | Continuity | |
| 1 - Ground | Constant | B+ Voltage | |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.