I live in Japan and here the infotainment system in cars all have broadcast TV tuners and DVD players as standard equipment. They're supposed to blank the vide

I live in Japan and here the infotainment system in cars all have broadcast TV tuners and DVD players as standard equipment. They're supposed to blank the video out when the car is moving (going audio-only), but your dealer will pretty much by default pull the one sense wire on the back of the unit that causes it to do that so you can watch TV when driving, since that's what everyone wants. Now here comes the interesting part - despite having the sense wire pulled so that it can play video while in motion, it will still disable the settings menu when the car is moving. So there must be a second sense wire somewhere in the wiring harness that it's using for the "real" safety feature, while leaving a sacrificial sense wire for the feature everyone will disable anyway. Very bizarre.