Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Test or repair open, short to ground or short to voltage on the RSA ground circuit and battery positive voltage circuit.
- If all circuits test normal, replace the rear HVAC control module.