Circuit/System Description
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
The auxiliary HVAC control assembly is an input to the primary HVAC control module. The primary HVAC control module uses a low reference circuit and a 5-volt reference circuit to determine the position of the auxiliary HVAC control switches. The auxiliary HVAC assembly has 3 signal circuits to relay the desired mode, temperature and blower motor speeds to the primary HVAC control module. The primary HVAC control module uses this input to adjust the desired positions of the mode, temperature and blower motor.