GM Service Manual Online
For 1990-2009 cars only

The vehicle is programmed to lock all doors automatically when the following are met:

    • All doors are closed.
    • The ignition is on.
    • The vehicle is shifted out of (P) Park.

This feature cannot be disabled.

All doors will unlock when the vehicle is shifted into (P) Park.

The power door unlock function can be programmed through prompts displayed on the Driver Information Center (DIC). See DIC Vehicle Personalization.

Automatic Locking

All the doors automatically lock when the ignition is in ON/RUN and the shift lever is moved out of PARK (P).

All doors must be closed. The automatic locking feature cannot be disabled.

All doors will lock again when the brake pedal is applied, a door is opened and then closed, and the brake pedal is released.

Programmable Automatic Unlocking

All the doors will automatically unlock when the shift lever is moved into PARK (P).

The unlocking feature can be programmed on or off by turning the ignition to ON/RUN, engine not running, and pressing the unlock part of the power door lock switch for eight seconds. The horn will chirp once when this feature is on and twice when it is off.