2007 GMC Yukon Owner's Manual - Page 222

Rear Air Conditioning and Heating System and Electronic Climate Controls If your vehicle has this system, the rear heat and air conditioning controls 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. To turn the system on, press the AUX button on the front climate control system, an indicator will be lit. Pressing the AUX button the first time will turn the rear system on in a mimic mode. In this mode, the airflow in the rear will be approximately the same direction, temperature, and fan speed as the front. Pressing the AUX button again will turn the rear system and the indicator off. If the rear controls are adjusted, the system will enter a rear independent mode. Airflow in the rear will then be directed according to the settings of rear controls. The rear system can be turned off by pressing the AUX button on the front climate control system and the indicator will turn off. If the indicator in the front AUX button is off, the rear system is off. Rear Control Integrated with Rear Seat Audio Controls 222