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.
- Disconnect the stop lamp switch and test for short to ground between terminal A of the stop lamp switch connector and terminal 37 of the TBCM.
- If the circuit test normal, replace the stop lamp switch.
- Test for short to battery positive between terminal A of the stop lamp switch connector and terminal 37 of the TBCM.
- If all circuits/connections test normal, replace the TBCM.