I recently installed the Boyo VTL422C backup camera to an Avic D3 in my 07 WRX. There are 3 cables to be connected: the rca input, the ground, and the power. I connected the rca input to the output cable on the d3 harness, i grounded the camera, and connected the power by tapping into the reverse light wire. I turned the camera ON through the AV menu, and there are 2 options for polarity: battery and ground. The problem is that the camera doesn't automatically turn on whenIi switch into reverse, though I can use it by switching to rear view in the Nav menu. I've tried both ground and battery options, and haven't come up with an answer. The camera also sometimes automatically turns on when i turn on the car. I've researched this problem and haven't found a solution yet. Please help! Thanks!

First of all you should not be powering the camera off of the reverse light. It should be powered off of the ACC wire. Other then that it sounds like you have a bad connection.

should that fix the problem? then i need to find the ACC wire in the trunk of my wrx...

Its the same red wire that switches your head unit on.

yeah i know but the cable isnt long enough to go back to the unit. would there be one in the trunk somewhere? or would it only be that red wire in the back of the dash

Well add a wire to it.

ok. well after tapping into accessory rather than reverse, will that allow it to automatically show the rear camera whenever i put it into reverse? is there some kind of setting for this? and should polarity be on battery or ground? Thanks!

No you need to connect the reverse wire from the unit to the reverse lights on the car. And dont worry about the polarity until you get the thing wired properly. You likely won't need to change it.

yeah i already did that. i took the reverse wire from the d3(purple/white) and connected that to the reverse light in the wrx (brown/yellow)

so i ran a wire from the accessory to the power of the backup camera, and as expected, nothing changed except that i can view the backup camera from the navi at any time even if its not in reverse. but my problem remains: it doesn't switch automatically to the backup camera when i put my car into reverse. sometimes it even randomly views the camera. i think it has something to do with the reverse wire from the harness to the reverse wire in the car, but i dont know what the problem could be because i made solid connections. please help thanks

Now reverse the polarity.

that didnt do anything. but i got it working. the wrx has 2 reverse light wires, and i decided to tap into the one i didnt try, even though i was sure it wouldnt make a difference...it worked. now when i put the car into reverse, it automatically switches to the rear camera view. and because i tapped into the accessory as well, i can view the rear view through the navi even when im not in reverse. thanks for all ur help!!