GM Service Manual Online
For 1990-2009 cars only

You can use the Remote Keyless Entry (RKE) transmitter to lock and unlock the doors from inside or outside the vehicle. See Remote Keyless Entry (RKE) System Operation for more information.

In vehicles with power door lock switches, the switches are located on the doors.

Press the top of the switch to lock all doors. Press the bottom of the switch to unlock all doors.