GM Service Manual Online
For 1990-2009 cars only

Programmable power door locks are intended to provide enhanced security and convenience by automatically locking and unlocking doors under certain conditions. The doors can be set to one of four operating modes.

Mode 1: Doors do not lock or unlock automatically when the transaxle is shifted out of or into PARK (P).

Mode 2: All doors automatically lock when the transaxle is shifted out of PARK (P), but do not unlock automatically when the transaxle is shifted into PARK (P).

Mode 3: All doors automatically lock when the transaxle is shifted out of PARK (P) and automatically unlock when the transaxle is shifted into PARK (P).

Mode 4: All doors automatically lock when the transaxle is shifted out of PARK (P) but only the driver's door automatically unlocks when the transaxle is shifted into PARK (P).

The vehicle was originally programmed to Mode 3. The mode may have been changed since then. To determine the current mode, or to change the mode, do the following:

  1. Turn the ignition key to RUN.
  2. Close all of the doors.
  3. Apply the brakes.
  4. Press and hold the power door lock switch in the lock position.
  5. Move the shift lever out of and back into PARK (P) while holding the door lock switch in the LOCK position.
  6. Release the door lock switch to set the desired mode.

After initially moving the shift lever out of and back into PARK (P), each additional shift cycle will advance the programming from the current mode to the next operating mode. If cycled beyond Mode 4, the vehicle will enter operating Mode 1.

Disconnecting the vehicle's battery for up to a year will not affect the programmed mode.