Circuit/System Description
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
The heated steering wheel module controls the heated steering wheel and the heated steering wheel ON indicator based on an input from the heated steering wheel switch. When the heated steering wheel switch is pressed, the switch signal circuit is pulled to ground. This indicates to the heated steering wheel module that steering wheel heat is requested. When the request is seen, the heated steering wheel module supplies voltage to the indicator lamp and supplies voltage to the heated elements, which are internal to the steering wheel.
On vehicles equipped with Super Cruise (UKL), the heated steering wheel module is a LIN device to the K124 Image Processing Module which will set the DTC.