2007 Chevrolet Colorado Owner's Manual - Page 116

Ignition Positions With the key in the ignition switch, you can turn to four different positions. If you have an automatic transmission, the ignition switch cannot be turned to LOCK unless the shift lever is in PARK (P). Notice: Using a tool to force the key from the ignition switch could cause damage or break the key. Use the correct key and turn the key only with your hand. Make sure the key is all the way in. If it is, turn the steering wheel left and right while you turn the key hard. If none of this works, then your vehicle needs service. ACC (ACCESSORY) (B): This is the position in which you can operate your 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 your vehicle must be pushed or towed. LOCK (A): This position locks the ignition. It also locks the transmission on automatic transmission vehicles. It will locks the steering wheel on manual transmission vehicles when the key is removed. It is a theft-deterrent feature. You will only be able to remove your key when the ignition is turned to LOCK. 116