2010 Hummer H3 Owner's Manual - Page 218

9-34 Driving and Operating (A) LOCK/OFF: This position locks the ignition. It also locks the transmission on automatic transmission vehicles. It locks the steering wheel on manual transmission vehicles. The key can only be removed in LOCK/OFF. On vehicles with an automatic transmission, the shift lever must be in P (Park) to turn the ignition switch to LOCK/OFF. The steering can bind with the wheels turned off center. If this happens, move the steering wheel from right to left while turning the key to ACC/ACCESSORY. If this doesn't work, then the vehicle needs service. (B) ACC/ACCESSORY: This is the position in which you can operate the electrical accessories or items plugged into the accessory power outlets. On automatic transmission vehicles, this position unlocks the ignition. On manual transmission vehicles, it unlocks the ignition and steering wheel. Use this position if the vehicle must be pushed or towed. (C) ON/RUN: This position can be used to operate the electrical accessories and to display some instrument panel cluster warning and indicator lights. The switch stays in this position when the engine is running. The transmission is also unlocked in this position on automatic transmission vehicles. If you leave the key in the ACC/ACCESSORY or ON/RUN position with the engine off, the battery could be drained. You may not be able to start the vehicle if the battery is allowed to drain for an extended period of time. (D) START: This is the position that starts the engine. When the engine starts, release the key. The ignition switch returns to ON/RUN for driving. Ignition Positions The ignition switch has four different positions. To shift out of P (Park), turn the ignition to ON/RUN and apply the regular brake pedal. Notice: Using a tool to force the key to turn in the ignition could cause damage to the switch or break the key. Use the correct key, make sure it is all the way in, and turn it only with your hand. If the key cannot be turned by hand, see your dealer.