PDC problem
 

Hello guys, since yesterday, all of the sudden, my parking sensors stopped working, and when I first turn the engine on, switch to reverse gear, I hear a long BEEEEEEEEEEEEP sound that is a little louder than the sound that simply and shortly beeped when the system was working, at the same time, my rear view camera installed by me about 2 months ago stopped working, but the two systems aren't normaly interconnected at all, maybe a coincidence, but who knows... also, a brake bulb failed about one week ago and without me doing anything, after 2 days it started working again... the camera is also now sometimes working (5% of times) and sometimes not (95% of times). All of this happened after a long 900 miles road from Italy to Germany, with heavy rain almost all the road.. Could this be a boot water leak? What should I check?

By the way, diagnosed the PDC system with Toaf and it says following:

13 - ultrasonic sensor rear middle right
-Errors count: 50
-Open circuit
-Error present
-Sporadic error

Check the rear harness behind the bumper for any breaks in the wiring, if water gets in the circuit it can cause the issue you mention.

Look for twirls of insulating tape covering the poor wiring joins. The circuit break is likely from one of those. A proper soldered join is better and then protected with some heat shrink sleeve.


TC

Had a similar issue and found it was one of the sensors had packed up.

TC, where should I look for what you've been describing?

Mike, you mean that one of the sensors was just faulty?

Behind the bumper as Trikey post 3.


TC

Yes - I had a spare so swapped it out in turn and found the culprit. :}

Looks like TOAF has already given you a clue. ;)

If everything looks fine behind the bunper and no cable broken or etc, then is it a method to test thr sensors itself to see if one is really the problem? Or to test the cabling or the unit itself to see where the problrm comes from if nothing wrong is visible to the eye, thanks.

A little update, ignition on, reverse gear, and the middle right sensor is indeed not clicking as it should, so there are 2 possibilities only, either cable interrupted or grounded because of the water hence the open circuit error in toaf or the sensor itself is dead, am I right?