Programming Instructions for 2003 Chevrolet Avalanche 1500 Remote Fob
You must have all GM remotes including working ones when performing this procedure.(This procedure essentially wipes allremotes from the vehicles memory so all must be reprogrammed***Press each button on the remote 26 times (lock x 26, unlock x 26, horn x26) then attempt the steps outlined below***
1. Close all doors on the vehicle.
2. Then insert key into the ignition.
3. Press and hold the power UNLOCK button on driver's side door panel. Do not release until instructed to do so in step 5.
4. Quickly turn the ignition ON, OFF, ON, OFF. (ON is the position just before of starting your vehicle, OFF is the position whereyou can pull your key out of the ignition)
5. Release the power unlock button on the driver's side door panel. The vehicle should respond by locking and unlocking automatically. If locks cycle then continue to step 6.(if the door locks begin to lock and unlock BEFORE releasing the unlock buttonthen the vehicle has not entered programming mode and you must start over. Remove key, open door and return to step 1. If thevehicle continues to lock and unlock before releasing the unlock button then there is a problem with the vehicles system and remotesmust be programmed by a certified professional. If you are unable to get the door locks to cycle then you are turning the key tooquick, too slow, there's a problem with the vehicles system, or the vehicle is not equipped with a factory keyless entry system.
6. Hold the LOCK and UNLOCK buttons on the remote at the same time until door locks cycle again. This could take up to 30seconds.
7. NOW repeat step 6. for all additional remotes including working ones.
8. After step 6. has been performed for all remotes TURN ignition to ON to exit programming mode.
9. Turn ignition OFF, remove key and test all remotes to make sure that they are all properly programmed.
Key Programming Information for 2003 Chevrolet Avalanche 1500
Do-It-Yourself programming procedure is not available for this vehicle. This vehicle requires a diagnostic equipment to be connected to the vehicle to program the key. You will need to find a local automotive locksmith or a dealer to program this key.Use our Locksmith Search if you need professional help.