Dual Zone Control Switch

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Passenger temperature control switch is provided to allow selection of air discharge temperatures on right side of vehicle. Temperatures can be set 8°F (4°C) cooler or warmer than the driver's setting. The switch has LEDs which will illuminate and inform the passenger of the setting. To operate in dual zone, the passenger moves the switch to the desired setting. Temperature offset will be allowed as long as the set temperature is not in maximum hot, or maximum cold settings.

Passenger-side temperature control switch can be turned off by turning the mode control knob fully counterclockwise. The entire HVAC system will turn off if mode control knob is turned fully counterclockwise a second time. Increased sun load on one side of the vehicle may cause the air temperatures to be different, even if the HVAC system is not operating in a dual zone mode. A 5-volt signal is sent to the passenger-side temperature control switch assembly through the passenger temperature control switch voltage supply circuit.

When a temperature switch is operated, voltage is sent through a series of in-line resistors, which varies the voltage. Driver door module communicates this message to passenger door module on 4 different passenger temperature signal circuits. When the temperature offset request is made to the passenger door module, the signal is sent to the driver door module. The driver door module is connected to the passenger door module through the power door serial data circuit.