Circuit/System Description
WARNING: This page is about a different car, the 2016 Cadillac CT6. However, it is still accessible from the selected car via links, so may be relevant.
When the engine running and the transmission is placed into R, a serial data message is sent to the Human Machine Interface Control Module and to the Video Processing Control Module indicating that camera operation is requested. Battery voltage, serial data, and ground are supplied to the video processing control module, and receives inputs from cameras attached to it. The Video Processing Control Module sends video information to the Human Machine Interface Control Module through a video signal + and a video signal - circuit. A grounded shielding also wraps the video signal circuits to reduce electronic interference which may degrade the video signal and cause a distorted or otherwise degraded image.