Remote Transmitter Batteries
WARNING: This page is about a different car, the 2002 Lincoln Blackwood. However, it is still accessible from the selected car via links, so may be relevant.
Insert a thin coin between the 2 halves of the remote transmitter near the key ring. Twist the coin to split the case of the transmitter. Once transmitter is open, remove battery and check voltage. Battery is a 3 volt lithium coin-type. If battery voltage is low, replace battery. If battery is okay, replace transmitter and reprogram all transmitters. See REMOTE TRANSMITTER under PROGRAMMING.