Auxiliary Heating Operation
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The operation of the front HVAC control assembly when put into the OFF position disables the auxiliary controls. When the front HVAC control assembly is put into the REAR position the rear auxiliary HVAC control module controls the auxiliary HVAC operation. Only the rear seat occupants can control the HVAC settings. When AUTO is selected on the front auxiliary HVAC assembly, the rear auxiliary HVAC control module uses calculations based on these following components to regulate the air temperature:
- Auxiliary inside air temperature sensor
- Upper auxiliary air temperature sensor
- Lower auxiliary air temperature sensor
- Auxiliary air temperature actuator
- Mode actuator
The signal from the front auxiliary control assembly for auxiliary air temperature signal is a varied 12 volt signal. When a warm air request is made the signal voltage is high. When a cool air request is made the signal voltage is low.