1999 GMC Sonoma Owner's Manual - Page 66

yellowblue 1. Insert a dime in the slot between the covers of the transmitter housing near the key ring hole. Remove the bottom by twisting the dime. 2. Remove and replace the battery with a three volt CR2032 or equivalent battery, positive (+) side up. 3. Align the covers and snap them together. 4. Resynchronize the transmitter. 5. Check the operation of the transmitter. Side Access Panel (Extended Cab) (If Equipped) Resynchronization Resynchronization may be necessary due to the security method used by this system. The transmitter does not send the same signal twice to the receiver. The receiver will not respond to a signal it has been sent previously. This prevents anyone from recording and playing back the signal from the transmitter. To resynchronize your transmitter, stand close to your vehicle and press and hold the LOCK and UNLOCK buttons on the transmitter at the same time for seven seconds. The door locks should cycle to confirm synchronization. If the locks do not cycle, see your dealer for service. Your vehicle may be equipped with a side access panel for convenience in loading and unloading cargo. To open the side access panel, first open the driver's front door. Then, use the handle on the panel to open it. You must close the side access panel before you can close the driver's door. 2-8