2010 Hummer H3 Owner's Manual - Page 32

2-6 Keys, Doors and Windows A chime sounds as an alert to indicate that the key has been left in the ignition. When the power door lock switch is pressed, a door is open, and the key is in the ignition all of the doors lock and then the driver's door unlocks. To engage a security lock: 1. Open one of the rear doors. 2. Use the ignition key to turn the lock toward the front of the vehicle. 3. Close the door. 4. Repeat these steps on the other rear door. To open a rear door when the security lock is set, unlock the door and open the door from the outside. To disengage a security lock: 1. Open one of the rear doors. 2. Use the ignition key to turn the lock to the vertical position. 3. Close the door. 4. Repeat these steps on the other rear door. Automatic Door Locks With an automatic transmission, the vehicle is pre-programmed to automatically lock the doors when shifted out of P (Park). All doors unlock when the vehicle is shifted back into P (Park). With a manual transmission, the vehicle is pre-programmed to automatically lock the doors when the vehicle speed reached 15 mph (24 km/h). Removing the key from the ignition unlocks the doors. To program the automatic door locks, see "Automatic Door Locks" under Driver Information Center (DIC) on page 5‑18. Safety Locks Each rear door can be locked so it cannot be opened from the inside. Lockout Protection This feature protects against locking the key in the vehicle when it is in the ignition. The rear door security lock is located on the inside edge of each rear door.