Circuit/System Testing
WARNING: This page is about a different car, the 2010 Saturn Outlook, 2010 GMC Acadia, 2010 Chevrolet Traverse, and 2010 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the ambient light sensor.
- Ignition OFF, test for less than 5 ohms between the appropriate ground circuit listed below and ground.
- Terminal B (with C67)
- Terminal C (with CD4E
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, verify the scan tool Ambient Light Sensor parameter is greater than 4.65 volts.
- If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
- Install a 3A fused jumper wire between the appropriate signal circuit and the ground listed below. Verify the scan tool Ambient Light Sensor parameter is less than 0.196 volts.
- Terminal A and terminal B (with C67)
- Terminal D and terminal C (with CJ2)
- If greater than the specified range, 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, test or replace the ambient light sensor.