The dvd on an aftermarket unit is looking for a signal from the parking brake. On my pioneer this signal is a ground, However, you cannot just ground the wire. The The unit wants to see the ground after the unit turns on. I installed a small 12v relay which is powered by the 12v amp turn on signal. I then connected a vehicle ground (you can use the same ground that powers the radio) to one side of the relay contact and the parking brake wire to other side of the relay contact. This relay provides the parking brake wire with the ground it needs, only after the stereo powers on.
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FI CBE, 20" forged specialties rims, swift springs, boston subs, kicker amp, focal components
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