Circuit/System Description
WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
The rear differential oil temperature sensor is a 2-wire negative temperature co-efficient thermistor. The sensor is mounted on the eLSD housing and outputs a voltage that represents the physical temperature of the rear differential fluid. A low reference and signal circuits enable the sensor to operate.