GM Service Manual Online
For 1990-2009 cars only

You can activate and de-activate this feature by turning the ignition key to "RUN" and pressing the "LOCK" portion of the power door lock switch for three seconds. If the horn chirps once after pressing the power door lock switch, the automatic door locking feature will operate. If the horn chirps twice after pressing the switch, the automatic door locking feature will not operate.

When this feature is activated on vehicles with automatic transaxles, all doors will lock as the transaxle is shifted out of "P" (Park) if the ignition key is in the "RUN" position and all doors are closed.

In the following situations, all doors will lock again when:

    • The brake pedal is applied, a door is opened and then closed, and the brake pedal is released, for a vehicle with an automatic transaxle.
    • A door is opened and then closed while the vehicle is moving faster than 3 mph (5 km/h), for a vehicle with an manual transaxle.

When this feature is activated on vehicles with manual transaxles, all doors will lock when the vehicle goes faster than 3 mph (5 km/h) if the ignition key is in the "RUN" position and all doors are closed.

If someone needs to get in or out of the vehicle after the doors have automatically locked, unlock all of the doors using a power door lock switch or unlock the door you want using the manual door lock control.

Automatic Door Unlocking

You can activate and de-activate this feature by turning the ignition key to "RUN" and pressing the "Unlock" portion of the power door lock switch for three seconds. If the horn chirps once after pressing the power door lock switch, the automatic door unlocking feature will operate. If the horn chirps twice after pressing the switch, the automatic door unlocking feature will not operate.

When this feature is activated, all doors a will unlock when the key is removed from the ignition.