Method 3-Scan Tool Required, Program All Transmitters

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: All transmitters which are to be recognized by the PDM must be programmed in a single programming sequence. When using this program method, all previously programmed transmitters will be erased upon the receipt of the programming signal from the first transmitter.

The order in which the transmitters are programmed will determine its numbering position within the PDM memory. The first transmitter programmed will be transmitter #1, and the second transmitter programmed will be transmitter #2. The number stamped on the transmitter case is for reference only: #2 can be programmed as #1, or vice versa. Additional unnumbered transmitters are also available.

Install a scan tool.
Turn the ignition ON, with the engine OFF.
Use the scan tool in order to access the passenger door module Special Function menu.
Select "Program All Key Fobs" to clear the LDM memory.
Follow the directions on the scan tool in order to program the transmitter or transmitters.
Operate the transmitter functions in order to verify correct system operation.