GM Service Manual Online
For 1990-2009 cars only

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.

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 turns the rear system and the indicator off.

If the rear controls are adjusted, the system enters 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.

To turn the system on from the rear, press any rear climate control button, except the button. To turn the system off, press and hold the button.

Rear Climate Control with Rear Seat Audio Controls


Object Number: 1658591  Size: B3

Automatic Operation, If Equipped.

AUTO: Press the mode button until this setting is selected to control the inside temperature, the air delivery, and the fan speed. AUTO will illuminate in the display when automatic operation is active.

+/- (Increase/Decrease Temperature) : Press the + or - buttons to increase or decrease the cabin temperature. The rear control temperature display will show the temperature setting decreasing or increasing.

The display only indicates climate control functions when the system is in rear independent mode.

Manual Operation

(Fan): Use the fan buttons on the rear seat audio control panel to manually adjust the fan speed. To increase or decrease the airflow, press the or button. Pressing the fan up button when the system is off will turn the system on. The air delivery mode will remain under automatic control. To turn the rear system off, keep pressing the button.

+/- (Increase/Decrease Temperature): These buttons select the temperature of the air flowing into the passenger area. Press the + button for warmer air and press the - button for cooler air.

(Mode): Press the mode button to manually change the direction of the airflow in the vehicle. Repeatedly press the button until the desired mode appears on the display. Multiple presses will cycle through the delivery selections.