GM Service Manual Online
For 1990-2009 cars only

The last door closed locking feature will delay the power locking of the doors and liftgate for up to five seconds after exiting the vehicle, when the power door lock switch or the lock button on the remote keyless entry transmitter is used to lock your vehicle.

To cancel this delay, press the power door lock switch or the lock button on the remote keyless entry transmitter a second time immediately.

If any door or the liftgate is open when locking the vehicle, three chimes will be heard signaling that last door closed locking is being used. Five seconds after the last door is closed, all of the doors will lock.

If the ignition is in RUN or ACCESSORY, this feature will not lock the doors.

To turn the last door closed locking feature off or on, see Vehicle Personalization .