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 HVAC control module supplies the air duct temperature sensors with a low reference circuit and 5-volt signal circuit. The HVAC control module determines the voltage drop across the sensor, which is proportional to temperature. As the air temperature increases, the sensor resistance decreases and the voltage signal decreases. As the air temperature decreases, the sensor resistance increases and the voltage signal increases.
- DTC B0173 output Air Temperature Sensor 1 refers to the upper left air duct temperature sensor
- DTC B0178 output Air Temperature Sensor 2 refers to the lower left air duct temperature sensor
- DTC B0509 output Air Temperature Sensor 3 refers to the upper right air duct temperature sensor
- DTC B0514 output Air Temperature Sensor 4 refers to the lower right air duct temperature sensor