Dual Zone Operation

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

The HVAC control module has temperature settings for the driver and the passenger. If the passenger setting is turned OFF then the driver setting controls both driver and passenger and rear seat temperature actuators. The passenger and rear setting cannot be used without the driver setting also being ON. The passenger setting can be turned ON by pressing the PASS button or the passenger colder and warmer buttons, to turn off press the PASS button. The rear control can be turned ON and OFF using the front HVAC control module. The rear control can also be turned ON by touching any rocker button on the control head, the fan blower rocker button when going down in blower speed will turn OFF the control head. When the passenger setting is ON, the passenger temperature can be adjusted independently from the driver setting and the passenger temperature is displayed on the passenger side of the HVAC control module. A different sunload on one side of the vehicle may cause different discharge air temperatures, even when the passenger setting is not turned ON.