Temperature Sensors

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

As mentioned above in the heated/cool ventilation module description, the seat cushion and seat back temperature sensors are each packaged with a TED and blower motor as an assembly. The seat temperature sensors are thermistors which are attached directly to the fins of each TED. The CCSM supplies a 5 V reference voltage through the temperature sensor signal circuit and ground through the temperature sensor low reference circuit to the respective seat cushion and seat back temperature sensors. As the temperature of the TED changes, the resistance of the thermistor varies changing the feedback voltage of the temperature sensor signal circuit. This voltage varies from 0.5 - 4 V. The CCSM monitors this voltage signal to determine the fin temperature so that it can adjust and maintain the seat temperature to the selected switch input.