Circuit/System Description
WARNING: This page is about a different car, the 2018 Cadillac XTS. However, it is still accessible from the selected car via links, so may be relevant.
The Radio receives a signal from the BCM when the vehicle is placed in reverse. The reverse gear status is used to determine when to activate the rearview camera display. The Radio compares reverse signal to the serial data message to verify the plausibility of the signal.