My Chevy Volt has a pretty nice LCD touchscreen on the central console, but it is only used for car controls. Naturally, I want to connect this touchscreen to another device, such as a Raspberry Pi, to be able to use navigation, reverse camera and better music controls.

There are existing aftermarket devices for connecting to in-car touchscreens, but they cost several hundred dollars and are usually tailored towards Android Auto or CarPlay.

Considering that LCD screen's parallel interface is 18-bit RGB, and that Raspberry Pi can output parallel RGB signals up to 24-bit natively, it should be possible to build a device to switch inputs between Volt's LCD display driver and Raspberry Pi (or another LCD driver).