Ignition Positions; Retained Accessory Power (Rap) - GMC 2004 Yokon Denali Owner's Manual

Ignition Positions

With your key in the ignition switch you can turn it to
four different positions.
A (LOCK): This position locks your ignition and
transmission. It's a theft-deterrent feature. You will only
be able to remove your key when the ignition is
turned to LOCK.
Notice: If your key seems stuck in LOCK and you
can not turn it, be sure you are using the correct
key; if so, is it all the way in? Turn the key only with
your hand. Using a tool to force it could break the
key or the ignition switch. If none of these works,
then your vehicle needs service.
B (ACCESSORY): This position allows you to use
things like the radio, power windows and the windshield
wipers when the engine is off.
C (RUN): This position is for driving.
D (START): This position starts your engine.

Retained Accessory Power (RAP)

The Retained Accessory Power (RAP) feature will allow
certain features on your vehicle to continue to work for up
to 10 minutes after the ignition key is turned to LOCK.
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