Circuit/System Description
WARNING: This page is about a different car, the 2021 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 A11 Radio, combined into an assembly called the A22 Radio Control. The assembly is supplied battery voltage and ground from the vehicle harness. The A11 Radio communicates digital video data for on-screen display through a dedicated cable containing the LVDS data circuits.
The Human Machine Interface is internal to the A11 Radio. If the A11 Radio detects the A22 Radio Control is not responding to the output on the LVDS circuits, the radio sets the DTC.