1999 Cadillac Seville Owner's Manual - Page 62

yellowblue Resynchronization Pressing the transmitter buttons numerous times (approximately 250 times) out of the vehicle's operating range may cause the transmitter not to work. Replacing the battery and pressing the transmitter buttons out of range will also cause the transmitter not to work. If only the fuel door button works, the transmitter needs to be resynchronized to the receiver. Do this by pressing and holding both the lock and unlock buttons on the transmitter for about eight seconds. You must be within range of the vehicle. Once the transmitter has been resynchronized, the horn will sound and the exterior lamps will flash once. The system should now operate properly. See your dealer for service if your transmitter still doesn't work properly. 2. Once the transmitter is separated, use a pencil (or a similar object) to remove the old battery. Do not use a metal object. 3. Insert the new battery as the instructions under the cover indicate. 4. Snap the transmitter back together tightly to be sure no moisture can enter. 5. Resynchronize the transmitter. See the instructions that follow. 2-10