Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. 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.