1994 GMC Suburban Owner's Manual - Page 68

Ignition Switch Use your square key to start your vehicle. The square key lets you turn the ignition switch to fivedifferent positions: 1. OFF 2 2. RUN 3. START 5 4. ACC 5. LOCK ACC (Accessory): ACC lets you use things like the radio and the windshield wipers when the engine is off. To get into ACC, push in the key and turn it toward you. Your steering wheel will remain locked, just as it was before you inserted the key. LOCK: This position locks your ignition, steering wheel and transmission. It's a theft deterrent feature. You will only be able to remove your key when the ignition is turned to LOCK. OFF: This position lets you turn off the engine but still turn the steering wheel. Use OFF if you must have your vehicle in motion while the engine is off (for example, if your vehicle is being pushed). RUN: This is the position for driving. START This starts your engine. 2- 12