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 outside mirror switch, which is part of the S79D Driver Front Side Door Window Control Switch is used with the S79P Passenger Front Side Door Window Control Switch to activate the fold/unfold motors through bi-directional control circuits. Voltage is sent to the commanded mirror via a mirror control circuit. The opposite mirror control circuit acts as a ground circuit for the bi-directional mirror motor. Ground is applied through the switch, The outside rearview mirror switch will also send a serial data message to the K9 Body Control Module requesting the mirror fold/unfold command, the S79D Driver Front Side Door Window Control Switch will then send the command to the S79P Passenger Front Side Door Window Control Switch which will also command the passenger mirror to fold or unfold.