2003 GMC Sonoma Owner's Manual - Page 80

Remote Keyless Entry System Operation If your vehicle has this feature, you can lock and unlock your doors from about 3 feet (1 m) up to 30 feet (9 m) away using the remote keyless entry transmitter supplied with your vehicle. UNLOCK: When you press UNLOCK, the driver's door will unlock automatically, the parking lamps will flash and the interior lights will go on. LOCK: Press LOCK to lock all the doors. Press LOCK again within three seconds and the horn will chirp. When the panic button with the horn syrnbo! on the keyless entry transmitter is pressed, the horn will sound and the headlamps and taillamps will flash for up to 30 seconds. This can be turned off by pressing the panic button again, waiting for 30 seconds, or starting the vehicle. .&(Panic Alarm): Matching Transmitter(s) to Your Vehicle Each remote keyless entry transmitter is coded to prevent another transmitter from unlocking your vehicle. If a transmitter is lost or stolen, a replacement can be purchased through your dealer. Remember to bring any remaining transmitters with you when you go to your dealer. When the dealer matches the replacement transmitter to your vehicle, any remaining transmitters must also be matched. Once your dealer has coded the new transmitter, the lost transmitter will not unlock your vehicle. Each vehicle can have a maximum of four transmitters matched to it. If you press UNLOCK again within three seconds, the remaining doors will unlock, the parking lamps will flash and the interior lights will go on. 2-5