Circuit/System Description
WARNING: This page is about a different car, the 2015 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
The Navigation Control Module can play events on the info display module. The Navigation Control Module sends a request to the radio via the video display request signal circuit. If the radio grants the request, the radio sends a command to the info display module via serial data.