Cadillac 2010 DTS Owner's Manual page 132

This position is where the key returns to
after the vehicle is started. This position displays some
of the warning and indicator lights.
The battery could be drained if you leave the key in the
ACC/ACCESSORY or ON/RUN position with the engine
off. You may not be able to start the vehicle if the
battery is allowed to drain for an extended period
of time.
This position starts the engine.
A warning chime will sound and the Driver Information
Center (DIC) will display DRIVER DOOR OPEN when
the driver door is opened if the ignition is in LOCK/OFF,
ACC/ACCESSORY and the key is in the ignition. See
DIC Warnings and Messages on page 4 66 for more
information.
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These vehicle accessories can be used for up to
10 minutes after the ignition key is turned off:
Audio System
Audio Steering Wheel Controls
Power Windows
Sunroof (if equipped)
Power to these accessories will work up to 10 minutes
or until the driver's door is opened. For an additional
10 minutes of power, close all the doors and turn the
key to ON/RUN and then back to LOCK/OFF.
Move the shift lever to P (Park) or N (Neutral).
The engine will not start in any other position. To restart
the engine when the vehicle is already moving, use
N (Neutral) only.