Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.

The M75 Windshield Wiper Motor communicates with the K9 Body Control Module via LIN and responds to requests to turn the windshield wipers on and off, as well as to vary the wiper speed. The M75 Windshield Wiper Motor receives a constant chassis ground. B+ is controlled by the KR12B Windshield Wiper Relay. In operation, the M75 Windshield Wiper Motor monitors LIN messages to determine the requested wiper selection is requested. The M75 Windshield Wiper Motor also monitors voltage on a discrete signal circuit to determine high speed wiper requests. The M75 Windshield Wiper Motor includes a DC motor and an internal position switch to indicate the wiper park position. When wiper operation is requested, the DC motor spins. The spinning motor is directed to a wiping motion through the windshield wiper transmission. When wiper operation is no longer required, the M75 Windshield Wiper Motor will continue spinning until the internal position switch indicates it is in the park position.