GMC 2010 Yukon/Yukon XL Owner's Manual page 303

To minimize taking your eyes off the road while driving,
do the following while the vehicle is parked:
Become familiar with the operation and controls of
the audio system.
Set up the tone, speaker adjustments, and preset
radio stations.
For more information, see Defensive Driving on
page 5 2.
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 3 29 for more information.
To set the time and date:
1. Turn the ignition key to ACC/ACCESSORY or
ON/RUN, then press the
radio on.
2. Press the button to display HR, MIN, MM, DD,
YYYY (hour, minute, month, day, and year).
3. Press the softkey located under any one of the
tabs to change that setting.
4. To increase the time or date, do one of the
following:
Press the softkey below the selected tab.
Press the SEEK button.
Press the FWD button.
Turn the knob clockwise.
button to turn the
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