GMC 2010 Yukon/Yukon XL Owner's Manual page 250

For vehicles with the rear heat and air conditioning
controls, they are integrated with the rear seat audio
controls located in the center console. The system can
be controlled from the front controls as well as the rear
controls.
A. Fan Control
B. Air Delivery Mode Control
C. Temperature Control
4-28
Press the REAR button on the front climate
control system to turn the rear climate control system
on or off. An indicator comes on when the rear system
is on.
The rear climate control system can also be turned
off by pressing and holding the
system on from the rear seats, press any rear climate
control button, except the
This mode matches the rear climate
control to the front climate control airflow settings.
It comes on when REAR is pressed the first time.
This mode directs rear seating
airflow according to the settings of the rear controls.
To turn the system on from the rear, press any rear
climate control button, except the
button. To turn the
button.
button.