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 windshield temperature sensor is part of a LIN windshield sensor array that provides the BCM information about the passenger compartment side windshield temperature. A fused B+ circuit and ground is provided by the wiring harness. The sensor sends a LIN serial data message to the BCM.