2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 152

To open a rear access door from the inside, the front door must be opened first. Then, use the handle located on the inside of the rear access door to open. Tailgate { WARNING: It is extremely dangerous to ride on the tailgate, even when the vehicle is operated at low speeds. People riding on the tailgate can easily lose their balance and fall in response to vehicle maneuvers. Falling from a moving vehicle may result in serious injuries or death. Do not allow people to ride on the tailgate. Be sure everyone in your vehicle is in a seat and using a safety belt properly. On vehicles with a lock on the tailgate, use the key to lock or unlock the tailgate. Open the tailgate by lifting up on its handle while pulling the tailgate toward you. To shut the tailgate, firmly push it upward until it latches. After you put the tailgate back up, pull it back towards you to be sure it latches securely. Crew Cabs If your vehicle is a crew cab, you can open your doors from the inside or outside. Your vehicle may also have a feature which prevents children from opening the rear doors. See Rear Door Security Locks on page 3‑12 for more information. 3-14