GMC 2010 Yukon XL Denali Owner's Manual page 321

Battery Replacement
To change the remote control batteries:
1. Slide the rear cover back on to the remote control.
2. Replace the two batteries in the compartment.
Make sure that they are installed correctly, using
the diagram on the inside of the battery
compartment.
3. Replace the battery cover.
If the remote control is to be stored for a long period of
time, remove the batteries and keep them in a cool,
dry place.
Tips and Troubleshooting Chart
Problem
No power.
The picture does not fill the
screen. There are black
borders on the top and
bottom or on both sides or
it looks stretched out.
In auxiliary mode, the
picture moves or scrolls.
The remote control does
not work.
Recommended Action
The ignition might not be
turned ON/RUN or in
ACC/ACCESSORY.
Check the display mode
settings in the setup menu
by pressing the display
menu button on the remote
control.
Check the auxiliary input
connections at both
devices.
Check to make sure there
is no obstruction between
the remote control and the
transmitter window.
Check the batteries to
make sure they are not
dead or installed
incorrectly.
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