GMC 2011 Sierra - Manual (Page 228)

Black plate (2,1) GMC Sierra Owner Manual - 2011
7-2 Infotainment System
The vehicle has Retained
Accessory Power (RAP). With RAP,
the audio system can be played
even after the ignition is turned off.
See Retained Accessory Power
(RAP) on page 9‑40 for more
information.
Navigation/Radio System
For vehicles with a navigation radio
system, see the separate Navigation
System Manual.
Theft-Deterrent Feature
TheftLock ® is designed to
discourage theft of the vehicle's
radio by learning a portion of the
Vehicle Identification Number (VIN).
The radio does not operate if it
is stolen or moved to a different
vehicle.
Operation
AM-FM Radio