I have an app radio 4 and the cheapo Nissan reverse light camera. I have no issues. Setting for camera in head unit need to be power on with battery, not ground. Red wire + video rca needs to be in the brown rca input on head unit with the red wire connected to reverse trigger wire.
On bumper side with camera power needs to be tapped on reverse lights (easier to do from the passenger side) and the extension plugged into the camera. I have 0 issues with mine. Turns on and off as expected.
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