2004 Buick Century Owner's Manual - Page 75

Battery Replacement The battery in the remote keyless entry transmitter should last about three years. If the battery is weak the transmitter will not work within its normal range. It is probably time to change the battery if you have to be very close to the vehicle before the transmitter works. 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. To replace the battery do the following: 1. Insert a flat object like a thin coin into the slot on the back of the transmitter and pry apart the front and back. 2. Remove the old battery, but do not use a metal object to do this. Make sure the new battery is a type CR2032 or equivalent, and that the positive (+) side of the battery is facing down. 3. Snap the front and back of the transmitter together. 4. Resynchronize and test the operation of the transmitter with the vehicle. Resynchronization After the battery has been changed in the remote keyless transmitter, it will need to be resynchronized. To do this, press and hold both the LOCK and UNLOCK buttons until you hear one horn chirp. 2-9