I installed an Android head-end unit (link) to replace the factory 6 CD changer and everything is working great EXCEPT when I try to connect a backup camera (link). I connected the detection wire and video cable to the appropriate points in the head-end unit, but when I connect the other end to the reverse light wire there is some low residual power (2-3 volts as measured by a multimeter) in the circuit even when the car is not in reverse. It is enough power that the head-end unit triggers its "show the camera image" mode, but not enough power that it actually powers up the camera - so essentially the head unit is stuck showing a "no image available" message. When I actually do put the car in reverse, I get a full 12v of power in the circuit, the camera powers on and I see the image on the head unit just like I'm supposed to. The two things I can think of to try are: (1) insert a resistor in between the reverse light and the detection circuit to try to absorb the residual power (but not such a big resistor that it will absorb the power when the car is in reverse and the circuit is at full power) or (2) see if I can get a relay with the detection side high enough that it won't be tripped by the residual power (I don't even know if such a thing exists). Has anyone else encountered this problem? Any suggestions?