Circuit/System Testing
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X3 harness connector at the turn signal multifunction switch.
- Ignition ON, verify the scan tool Windshield Wiper Switch parameter is OFF.
- If not the specified value, test the signal circuit terminal N 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.