Infotainment Controls and Display

WARNING: This page is about a different car, the 2020 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

The infotainment display and controls are a separate component from the radio, combined into an assembly. The assembly contains the control knobs and buttons for all audio and HVAC functions and the information display. The assembly is supplied battery voltage and ground from the vehicle harness.

Control information, touch communications and dimming level for the display are communicated via a LIN serial data circuit to the Radio.

The remote radio receiver sends the display digital video data for on-screen display through a dedicated video cable.

The information display provides a feedback on the touch screen and certain controls.

The controls communicate via a LIN serial data circuit with the remote radio receiver. Messages communicated include the following:

Wake-up/power state messages
Diagnostic information
Button presses/knob rotations
Commands for the state of indicators
Back-lighting dimming level

HVAC data for controls and status indicators is communicated between the HVAC controls and the HVAC control module with a separate LIN serial data circuit.

On some system configurations for model year 2019 (and forward), the Infotainment Controls and Display are connected only via dedicated video cable (LVDS cable). All data communication previously transmitted via LIN and GMLAN will be sent via LVDS cable on these systems. Programming/reprogramming of the Infotainment Controls and Display will be performed through USB port and sent from the Radio to the Display via the LVDS cable.