GMC 1996 Savana Van Owner's Manual page 72

LOCK (B): 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 (C): This position lets you turn off the engine
but
still turn the steering wheel. It doesn't lock the steering
wheel like LOCK.
Use OFF if you
must have your
vehicle in motion while the engine is off (for example,
if your vehicle is being pushed).
RUN (D): This is the position for driving.
START (E): This starts your engine.
. .
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I
I
NOTICE:
Starting Your Gasoline Engine
If you have a diesel engine, see "Starting Your Diesel
Engine" in the Diesel Engine Supplement.
Move your shift lever to PARK (P) or NEUTRAL (N).
Your engine won't start in any other position
--
that's a
safety feature. To restart when you're already moving,
use NEUTRAL (N) only.
NOTICE:
I
Don't try to shift to PARK (P) if your vehicle
is moving. If you do, you could damage the
transmission. Shift to PARK
(P)
only when
your vehicle is stopped.
If your key seems stuck in LOCK and you can't
turn it, be sure it is all the way in. If it is, then
turn the steering wheel left and right while you
turn the key hard. But turn the key only with
your hand. Using a tool to force it could break
the key or the ignition switch. If none of this
works, then your vehicle needs service.
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