GMC 2012 Terrain Owner's Manual page 239

WARNING
Turning off the vehicle while
moving may cause loss of power
assist in the brake and steering
systems and disable the airbags.
While driving, only shut the
vehicle off in an emergency.
If the vehicle cannot be pulled
over, and must be shut off
while driving, turn the ignition
to ACC/ACCESSORY.
The ignition switch can bind in the
LOCK/OFF position with the wheels
turned off center. If this happens,
move the steering wheel from
right to left while turning the key
to ACC/ACCESSORY. If this does
not work, then the vehicle needs
service.
B (ACC/ACCESSORY): This
position provides power to some
of the electrical accessories.
It unlocks the steering wheel and
ignition. To move the key from
ACC/ACCESSORY to LOCK/OFF,
push in the key and then turn it to
LOCK/OFF.
C (ON/RUN): The ignition
switch stays in this position
when the engine is running.
This position can be used to
operate the electrical accessories,
including the ventilation fan and
12 volt power outlets, as well as to
display some warning and indicator
lights. This position can also be
used for service and diagnostics,
and to verify the proper operation
of the malfunction indicator
lamp as may be required for
emission inspection purposes.
The transmission is also unlocked
in this position on automatic
transmission vehicles.
Driving and Operating
The battery could be drained if the
key is left in the ACC/ACCESSORY
or ON/RUN position with the engine
off. The vehicle might not start if the
battery is allowed to drain for an
extended period of time.
D (START): This position starts
the engine. When the engine starts,
release the key. The ignition switch
will return to ON/RUN for normal
driving.
A warning tone sounds when the
driver door is opened if the ignition
is still in ACC/ACCESSORY and the
key is in the ignition.
9-25