Circuit/System Description

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 radio communicates with the Infotainment Faceplate Control Module or faceplate over the CAN Graphical Interface (CGI) serial data circuit. The CGI circuit is a UART - based serial data interface used to transfer messages and high rate display graphics.

When the faceplate is in the active state, the radio needs to determine if the faceplate is communicating properly. The radio initiates a Display Status Message to the faceplate and waits for a proper status response message back from the faceplate. If after 30 communication attempts without a proper response, the radio holds down the reset circuit in order to reset the faceplate.

This DTC indicates an internal ECU fault or a stuck button on the faceplate. No external circuits are involved.