Set-up for Module Programming/Reprogramming
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Ensure that the vehicle battery is fully charged and that a battery charger is no longer connected. If performing this procedure for module replacement, install new module before proceeding. Before reprogramming close the doors and wait two minutes to allow other modules to stop communicating via the class 2 data line. Failure to do so could result in a failed reprogramming procedure.
- Turn OFF all accessories.
- Turn ON the ignition, with the engine OFF.