GMC Sierra Owners Manual
There are several ways to lock and unlock the vehicle.
From outside, use the Remote Keyless Entry (RKE) transmitter or the key in the driver door.
From inside, use the power door locks or the manual door locks. To lock or unlock the door with the manual locks, push down or pull up on the manual lock knob.
Power Door Locks
If available, the switches are on the front doors.
: Press to unlock the doors.
: Press to lock the doors.