2003 GMC Sierra 1500 Pickup Owner's Manual - Page 99

Rear Door Security Locks (Crew Cabs) With this feature, you can lock the rear side doors so that they cannot be opened from the inside by passengers. 3. To engage the rear door security lock, move the lever forward. 4. To disengage the lock, move the lever rearward. 5. Close the door. 6. Do the same thing to the other rear door. The rear doors of your vehicle cannot be opened from the inside when this feature is in use. If you want to open the rear door while the security lock is engaged, unlock the door and open the door from the outside. Lockout Protection This feature protects you from locking your key in the vehicle when the key is in the ignition and a door is open. If the power lock switch is pressed when a door is open and the key is in the ignition, all of the doors will lock and then the driver's door will unlock. This feature is located on the inside edge of the rear doors. 1. To use one of the locks do the following: 2. Open one of the rear doors. 2-12