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.
IMPORTANT:
Repair any Brake System related DTCs before using this diagnostic.
IMPORTANT:
This DTC may be stored as a history DTC without affecting the operation of the BCM. Do not replace the BCM if this DTC is stored only as a history DTC and is not retrieved as a current DTC.
- Verify proper operation of the vehicle stop lamps. refer to Exterior Lighting Systems Description and Operation
.
- If the vehicle stop lamps do not operate as described, refer to Symptoms - Lighting .
- Ignition ON, press and release the brake pedal several times. With a scan tool, verify DTC P0703 is not set as current in the ECM.
- If DTC P0703 is current in the ECM, replace the BCM.
- The system is OK. Clear the history DTC. Do not replace any components.