GM Service Manual Online
For 1990-2009 cars only

Object Number: 1839823  Size: A3

The ignition switch has four different positions.

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/retailer.

(LOCK/OFF): This is the only position from which you can remove the key. The shift lever must be in P (Park) with the ignition in LOCK/OFF to remove the key.

ACC (ACC/ACCESSORY): This position unlocks the transmission. It also lets you use things like the radio and windshield wipers while the engine is not running. To use ACC/ACCESSORY, turn the key clockwise to the first position. Use this position if your vehicle must be pushed or towed. See Recreational Vehicle Towing .

(ON/RUN): This position can be used to operate the electrical accessories and to display some instrument panel warning lights. The ignition switch will stay in this position while the engine is running. The battery could be drained if you leave the key in the ACC/ACCESSORY or ON/RUN position with the engine off. You may not be able to start the vehicle if the battery is allowed to drain for an extended period of time.

(START): This position starts the engine. When the engine starts, release the key. The ignition switch will return to the ON/RUN position for normal driving. A warning tone will sound when the driver door is opened, the ignition is in ACC/ACCESSORY or LOCK/OFF and the key is in the ignition.