There are some instances in which even minute scratches can result in a faulty touch screen. So, you should avoid using sharp objects on your car stereo touch screen. Liquid or water damage can also lead to an unresponsive head unit screen.
1) Before undoing the 2 screws on the ribbon cable cover (when screen is still attached to head unit), cover the exposed orifice in the Head Unit with masking tape (even if you are using a magnetic screwdriver).
Go into the Car settings - Factory settings. There should be an option Touch or similar. You can use this to re-calibrate the touch screen and reverse the mirror effect
Touch screen and buttons stopped working help! | XDA Forums jacobbloy My touch screen isn't working tried everything reset, power unplug, battery unplug. Only works with mouse and dongle, I want to try to reflash original

If the fuse is blown, the circuit audio will break, causing the radio to stop working. If the car radio sound and display intermittently work, then the head unit might be receiving insufficient power. Wiring is most likely the cause for the car radio to stop working. 3.

What have you done when your entune inevitably stops being sensitive to the bottom of the screen (meaning it doesn't register your touch anymore) and you can't add new Bluetooth devices, change what you're viewing on the vehicle information screen, etc.?

This should restart the software from scratch. If a single reset does not work, try removing the fuse for the head unit power for a minute to do a full power cycle reset. Check for any updates available and update the touchscreen driver/firmware to the latest versions from the manufacturer.

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    • head unit touch screen not working