Hi

I’m looking for some help again.

I have started getting all the issues fixed on my old Mark II Fabia 3 (10 Plate) ready to pass on to my daughter.

Problem I’m having is with the rear parking sensors (factory fitted), they stopped working years ago and I never bothered fixing them but they would be useful for her.

Read a few of the posts and saw that most of the issues were with the sensors, so I bought a couple from the well know auction site and sent to China for a set of 4 new ones, used the link in one of the posts.

This week I set about the task, took the rear bumper off using one of the site guides, makes it a lot easier taking the rear wheels off to get access the 2 wheel arch liner screws and then the screws in behind holding the bumper. Then I fit all of the new sensors and into the car I go, ignition on, into reverse, same as usual car picture on for a second and beep on for around 3 seconds, instant deflation. Then I go into problem solving mode, 10 sensors start trying different combinations, same outcome picture and long beep.

Now I’m stuck, I tried everything with the sensors, I’ve charged the battery, read that a drained battery could cause the problem, checked all the wiring from the sensors back through the rubber grommet into the boot until it disappears behind the panel, no obvious damage or breaks.

Does anyone have any ideas where to go next, I’ve already thought about taking the L/H panel off to have a look at the module but I don’t know what I’m looking for or what to check.

Any help would be most appreciated.

A VCDS scan would be a good place to start, as that will identify if (and what) sensor/s are at fault

Hi nige8021

I had to buy a scanner

Here are the results with the 4 original sensors in

01545

Short to plus

Sensor for parking aid, rear left (G203)

 

01546

Short to plus

Sensor for parking aid, rear mid-left (G204)

 

 01547

Short to plus

Sensor for parking aid, rear mid-right (G205)

 

01548

Short to plus

Sensor for parking aid, rear right (G206)

 

I then cleared the faults and replaced with the 4 sensors I bought from Aliexpress, exactly the same results on the 4 sensors. Next I cleared the faults and replaced 2 of the sensors with 2 I bought from Ebay, same result.

 

Am I likely to have 10 faulty sensors or could there be another issue?

 

Dougie

Edited 6 August, 20196 yr by dougiegair
Missed some text

The wiring loom from the PDC unit to the sensors 

Just to point out to the OP if they have not worked this out, the cable form has a common 12V feed to all the sensors and a common 0V feed/return to them all, plus individual wires for the sensors O/P.

 

 

has to be the loom