GMC 1995 Safari Owner's Manual page 66

Ignition Switch
Use your ignition key to start your vehicle. The ignition key lets you turn
the ignition switch to five different positions.
2
5
1. OFF
2. RUN
3. START
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.
NOTICE:
Don't operate accessories in the ACC position for long periods
of time. Prolonged operation of accessories in the ACC position
could drain your battery and prevent you from starting your
vehicle.
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.
2-14