All Things Mk5 > How to Guides / Troubleshooting

Rear parking assist problem

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Schorly:
Did a bit shifting about and the situation is now, that I can hear a faint ticking noise in one of the sensors. So I swapped the 'good' one to a position where I didn't hear a ticking noise and it stopped working. Plugging the sensor, which did not work in to the working position stared working. I only did this on one sensor position, but would suspect the same on the other. It is difficult to get the middle sensors out. There is a plug between the harness for the sensors and the harness to the control unit. So I think it is not the sensors, it is either the harness to all the sensors, the harness from sensor harness to control unit or the control unit. Is it possible to check what to expect on the wire positions in the plug of the harness? Does anybody have a pin out, maybe I can easily check the harness?

Schorly:
I found the supply voltage and ground. As I have easiest access to the two outermost sensors and the left hand one made the ticking noise and the right hand one does not, I concentrate on them. On both I can get the supply voltage, which is between the two outermost pins. In the middle is the return signal and on bot I get continuity between the sensor end and the plug between the two harnesses. So they both get power but one is making the sensor tick and the other doesn't . This really puzzles me. Nobody out there who can help and has an idea?

Schorly:
Went to work, stopped at the petrol station, put the cart in to reverse and I get the normal short sound from the parking sensor module. Went around the car and it looks like they all now work again??? Now I ma totally confused.

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