1996 GMC Sonoma Owner's Manual - Page 54

To replace batteries in the Keyless Entry transmitter: Tai@ You can open the tailgate by pulling up on the handle while pulling the tailgate down. When you put the tailgate back up, be sure it latches securely. Follow these steps if you want to remove the tailgate: 1. Raise the tailgate slightly. 1. Insert a dime in the slot between the covers of the transmitter near the key ring hole. Remove the bottom by twisting the dime. Remove both retaining cables. To remove each cable, turn it so the end faces the front. Then, push forward so the larger part of the hole is over the bolt. Pull the end over the bolt. 2. Remove and replace the batteries with two Duracella-type batteries (DL20 16 or equivalent), positive side down. 3. Align the covers and snap them together. 4. Check the operation of the transmitter. 2-6