Infotainment Faceplate Control Module
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
The operator interfaces with the radio system through the buttons and control knobs located on the Infotainment Faceplate Control Module or faceplate. The operator is able to control system power, volume, fade, balance, bass, and treble equalizations. When the operator turns a knob or pushes a button, a module in the faceplate sends a signal to the radio on a UART - based bus called CAN Graphical Interface (CGI). The CGI bus circuit is part of a wiring harness that connects the faceplate and radio.