2003 Buick Regal Owner's Manual - Page 75
2003 Buick Regal Manual
Page 75 highlights
Battery Replacement Under normal use, the battery in your remote keyless entry transmitter should last about three years. 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 to your vehicle before the transmitter works, it's probably time to change the battery. Nofice: 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. Gently pry apart the front and back. 2. Remove the old battery, do not use a metal object to do this. Replace it with the new one. Use type CR2032 or an equivalent. Make sure the positive (+) side of the battery is facing down. 3. Snap the top and bottom together, making sure the halves are together tightly so water won't get in. 4. Resynchronize and test the operation of the transmitter with your vehicle. Resynchronization After you have changed the battery in your transmitter, you will need to resynchronize the transmitter. To do this, press the LOCK and UNLOCK buttons at the same time and hold for approximately seven seconds or until one horn chirp is heard. 2-8