GM Service Manual Online
For 1990-2009 cars only

The keyless entry transmitters may become out of synchronization with the remote function actuator (RFA) module under the following conditions:

    • When changing the transmitter battery
    • Excessive pressing of the transmitter buttons while out of range of the vehicle

When a transmitter becomes out of synchronization, only the panic feature will operate from the transmitter.

To resynchronize the transmitter, perform the following steps:

  1. Hold the transmitter within range of the vehicle.

  2. Object Number: 262408  Size: SH
  3. Press and hold the transmitter LOCK (4) and UNLOCK (1) buttons simultaneously for 8 seconds.
  4. When the transmitter is synchronized with the vehicle. The horn sounds and the exterior lights flash if the transmitter is programed to do these functions.