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 o