Ghost touches, phantom inputs, and random screen behavior in GM vehicles are commonly misdiagnosed. This guide explains why the touchscreen digitizer and controller are almost always the real cause — not the HMI
Category: Troubleshooting Notes
Technical troubleshooting support for GM electronics, including communication issues, installation pitfalls, programming errors, module behavior anomalies, and root-cause diagnostics. Focused on real-world field experience and OEM-level system behavior to help identify and correct complex issues efficiently.
Why a Blank Screen Doesn’t Always Mean a Failed HMI
A blank or frozen infotainment screen on GM vehicles is often misdiagnosed as HMI failure. This guide explains how the MOST bus ring works, why the Radio is the system master, and how failures in any node—amplifier, cluster, media player, or wiring—can take the system down.