Quote Originally Posted by RedRocket View Post
Ok, now I understand that you have 2 separate ALP systems, each with 2 Sensors.
In the beginning, the Front system was ok...correct ?
The front system works well with the front sensors. When connected to the rear sensors, no error message but only one sensor works as parking sensors. But both detect my laser tester. I have the same results when I reverse the 2 rounds plugs of the cables.

Quote Originally Posted by RedRocket View Post
It was only the Rear system that was bad...correct ?
The back system works wrong: error message in any positions of the sensors. In one position, I get R2, F2, R1 are not OK (only R1, R2 are connected). When I reverse the cables, I get R2, F2 are not OK (only R1, R2 are connected).

Quote Originally Posted by RedRocket View Post
Do you want to start over by putting everything back to its original condition.- This way we can try to solve the problem you are having on the Rear.
You should not be getting U-boat "ping" sounds...make sure there are no objects close to the Rear Sensors & turn OFF power to the Front system.
All systems are in position. The back system doesn't work as just explained above.