Rear Defogger Switch Malfunction
WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector C2 at the HVAC control module.
- Ignition ON, verify the scan tool Rear Defog Switch parameter is OFF.
- If not the specified value, test the signal circuit terminal 22 for a short to ground. If the circuit tests normal, replace the BCM.
- Install a 3-A fused jumper wire between the signal circuit terminal 22 and ground. Verify the scan tool Rear Defog Switch parameter is ON.
- If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
- If all circuits test normal, replace the HVAC Control Module.