Circuit/System Testing
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the underhood fuse block connector C 5, inside rearview mirror, and rearview camera module (if equipped) that are in the circuit.
- Ignition OFF, disconnect the BCM harness connector C2 and test for a ground signal at the connector terminal 22.
- If the circuit exhibits a ground signal, repair the short to ground in the control circuit.
- Reconnect the inside rearview mirror and test the BCM harness connector C2, terminal 22 again for ground.
- If the circuit now exhibits a ground signal of 20 ohms or less, replace the inside rearview mirror.
- Reconnect the underhood fuse block connector and test the BCM harness connector C2, terminal 22 again for ground.
- If the circuit now exhibits a ground signal of 20 ohms or less, replace the underhood fuse block.
- If equipped, reconnect the rearview camera module and test the BCM harness connector C2, terminal 22 again for ground.
- If the circuit now exhibits a ground signal of 20 ohms or less, replace the rearview camera module.
- If the circuit does not exhibit a ground, replace the BCM.