I'm installing a new headunit for my R34. The information in the forum is extremely useful and I've managed to remove the existing Jap headunit and wired up the new unit with 0 previous experience. The new unit works fine except it does not play DVD and TV because the brake control wire is not connected to anywhere yet.
So when I play DVD or TV I can hear the sound but the screen always say do not watch video while driving even though the hand brake is on. The user manual says if I want to watch video while driving I should connect the brake wire to the power negative pole OR, the brake control wire should be directly grounded.
I did some googling and found that I could:
1. Connect the brake control wire directly to a metal part that is connected to the main body of the car to ground to wire.
OR
2. I can strip the "Ground" wire that connects to the ISO port (a black wire one end is connected to the car another end connected to the headunit), and then wire the brake control wire to it.
My questions is which option is correct or neither? Any heap is appreciated.