Circuit/System Testing
WARNING: This page is about a different car, the 2010 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the appropriate harness connector listed below at the ECM:
- X1 (L99/LS3)
- X2 (LLT)
- Connect a test lamp between the appropriate signal circuit terminal listed below and ground:
- Terminal 9 (L99/LS3)
- Terminal 52 (LLT)
- Ignition ON, press and release the brake pedal. Verify the test lamp turns ON and OFF when pressing and releasing the brake pedal.
- If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
- If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
- If all circuits test normal, replace the ECM.