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 C1 harness connector at the turn signal/multifunction switch.
- Ignition ON, verify the scan tool Windshield Wiper Switch parameter is not Switch Fault.
- If Switch Fault, test the windshield wiper switch low signal circuit terminal L for a short to ground. If the circuit tests normal, replace the BCM.
- If all circuits test normal, test or replace the turn signal/multifunction switch.