So I bought this head unit that has a DVD player. In order to activate the video portion you need to apply the parking brake. There is a parking brake wire that needs to be grounded while the headunit is powered on and then it activates the video. Well, I decided to buy a 4 wire relay and bypass the parking brake.
Parking brake wire from HU goes to #87
Ground to #30
Remote wire to #85
Ground to #86
The way it is setup it should, once the headunit is powered on, flip the relay between the parking brake wire and the ground wire, thus activating the video, but that is not happening.
When I manually take the parking brake wire and ground it while the HU is on it will activate the video, just not with the relay.