Circuit/System Description

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

The radio information display and controls are separate components from the radio. One or more configurations may be possible, dependent upon the available content for the vehicle. The DTC(s) that can set when a malfunction occurs can vary due to calibration differences required for the vehicle content.

Diagnosis of these communication DTCs is based upon the symptom observed in the vehicle.

Monochrome Displays

When the vehicle is equipped with a monochrome display, the radio and the display communicate with each other via CGI serial data. The radio controls communicate with the display via LIN communications, and the control messages are passed through to the radio.

When the display and controls are combined in an assembly, the communication between the two components occurs within the assembly. If the two components are separate, the communication between the display and the controls is external, via the wiring harness.

Color Displays

When the vehicle is equipped with a color display, the display and controls communicate individually with the radio. The radio communicates directly with the controls via CGI serial data. A dedicated video cable is used to communicate graphical information between the radio and the display.

For non-touch color displays, a dedicated dimming circuit is used. The radio provides an output to the display based on dimming level information the radio receives.

Touch screen color displays use touch serial data communication between the display and the radio to exchange touch data, backlighting, and dimming levels.