Transmitter Battery Replacement: Notes
WARNING: This page is about a different car, the 2002 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
The normal battery life is approximately 2 years. Replace the batteries when the range of the transmitter begins to decrease to less than approximately 7 m (23 ft). Use one 3-volt CR2032 battery or the equivalent.