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@martin8:
you cant check the system like follows:
Disconnect all four sensors from the control-box, then put in the reversing gear and check what the system does.
If it works proberly (I think it should beep one and than be quiet), one of the sensors might be damaged.
So just connect one sensor and try it again. If it works, check the other sensors in the same way to find the one which might be damaged.
If every one of the four sensors do work properly when connected alone, they are ok, so the failure must be in the box.
So check out the connectors of the box using one working sensor with each of the four sensor-connectors of the box
(one connector after the other). You might find the damaged connector this way, if there is one.
Hope you can locate the bug.
Let us know what happened while checking...
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