1997 GMC Sonoma Owner's Manual - Page 55

n When you press UNLOCK, the driver's door w111 unlock automatically. If you press UNLOCK again within five seconds, all the doors will unlock. Press LOCK to lock all the doors. Battery Replacement Under normal use, the battery in your remote keyless entry transmitter should last about twoyears. Matching lkansmitter(s) To Your Vehicle Each remote keyless entry transmitter is coded to prevent another transmitterfrom unlocking your vehicle. a If a transmitter is lost or stolen, 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 transmitterwill not unlock your vehicle. Each vehicle can have only two transmitters matched to it. You can tell the battery is weak if the transmitter won't work at the normal range in any location. If you have to get close toyour vehicle before the transmitter works, it's probably time to change the battery. NOTICE: When replacing the battery, use care not to touch any of the circuitry. Static from your body transferred to these surfaces may damage the transmitter.