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.
Defogger Switch Circuit
Inspect the defogger switch in the A/C control assembly circuit. Disconnect the connector from the A/C control assembly and inspect the connector on the wire harness side. See INSPECTING DEFOGGER SWITCH CIRCUIT table. See CONNECTOR IDENTIFICATION . If the circuit is not as specified, replace the switch. See DEFOGGER SWITCH under REMOVAL & INSTALLATION.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| B10 - Ground | Constant | Continuity |
| A1 - Ground | Constant | Battery Voltage |
| A2 - Ground | Ignition Switch LOCK | No Voltage |
| A2 - Ground | Ignition Switch ACC Or ON | Battery 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.