Back Up Sensors (Constant Noise)

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churious

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So my rear back up sensors have had an issue for some time. They are semi intermittent as they sometimes work correctly but are mostly always in what I call the constant on mode.

I have done some diagnosis this week after deciding to tackle the problem myself. I have read you can test these sensors by placing the rig in reverse while not on and listen to each sensor.

The two outside sensors are electronically snapping and the two inner sensors are not. Im not sure if the two inner are damaged or the harness is damaged. Anyone have the schematic or knowledge of how these are wired?
 

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