Man 19.414 Truck: Reverse Light Issue - Gear Sensor Checked, Hedgehog Replaced, Wiring Checked

Hello.
I have such a problem in the mana that when I turn the reverse gear, the lights do not turn on, once the lights are gone And once they are gone, I checked the sensor And it is good, the mass is controlled, the mass comes and goes out after switching on the gear And the light does not light up: / I don't know now what to do, I even replaced the so-called hedgehog which is responsible for the rear lights
I would ask for help in advance, thanks a lot for your help

Something doesn't really convince me of your ground control theory. It should be power from
fuse 21 to the reverse automat, with cable 71300 to the rear control unit to connector G pin W. Output with connector A pin 2, connector D pin 1 to the rear lamps and connector C pin 7 to the socket.

I had a torn beam and the sensor cables are going towards the cabin and there is a mass on this cable all the time even when the reverse works ? since I cleaned the plugs from these 5 beams under the hood, the reverse works without a problem so far

>>16515781 do you know which cubes under the bonnet are with the cables to the gearbox so that reverse works?