To be a bit clearer than my snarky post above: The "Brake" wire on the radio is designed to prevent you from operating some functions without the parking brake engaged (like watching a video). Its a safety feature.
Thus it is supposed to be connected to a switch connected to the parking brake. I wasn't sure if it was an active high (12V) or active low (0V) signal so I tried either one. I'm not to concerned with this particular safety feature since any video watching while going down the road will be done on the main TV by my son--not me driving.
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