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Old 31st October 2020, 21:49   #21
chicochapman
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"you will hear each one clicking."
If like me, you're well past retirement age, you may need a young person with good hearing to assist with this.
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Old 3rd November 2020, 11:14   #22
Avulon
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Quote:
Originally Posted by chicochapman View Post
"you will hear each one clicking."
If like me, you're well past retirement age, you may need a young person with good hearing to assist with this.

Or a mechanics stethoscope - a nice handy and useful, but rarely used, diagnostic tool.
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Old 4th November 2020, 16:29   #23
billh
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Right, so I've just TOAF'd the PDC (they can't touch you for it!)

All 4 sensors reports pretty much the same errors:
quote/
Ultrasonic sensor rear right
Errors count 50
short circuit supplier cable/datacable to ground
open circuit
oscillation ending error
error present
sporadic error

/quote

The opencircuit error will be when I was testing the cables without the sensors. I thought I'd fixed the dodgy wiring and cleaned the connectors. it looks like I have to re-visit the wiring. I can't believe all 4 sensors have gone faulty. Would I be correct in thinking that the PDC ECU must be ok if it is reporting the above data?
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Old 4th November 2020, 20:28   #24
richw
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I would clear all the errors. Then play with the system! for a bit and see which ones return. Some of that could be historic.

It seems unlikely that every sensor would fail, so I would suspect the wiring and any connectors.
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Old 5th April 2021, 09:21   #25
billh
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Quick update on this. Thanks to Mickyboy, replacement wire loom, inside bumper fixed it.
The ECU was ok . The original looms from ECU tested out ok for continuity but still didn't work. The replacement looms had a different plug/socket behind bumper and could not take original route, too short, so slight re-routing required.
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Old 12th May 2023, 11:24   #26
timon
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I'm hijacking this older post as my car has a parking aid problem.

Last month I replaced all 4 sensors because 1 was broken. Prior to the job, a long fault beep was present when putting the car in reverse. After replacement the beep was gone, so I connected the car to TOAF, made a backup, reactivated the reversing signal, put the car in reverse and everything seemed to work.

Now as it turns out, parking aid isn't working unless the ignition is on and either one of the parking aid's ECU connectors is disconnected and reconnected. Doing this fixes the parking aid until the ignition is turned off again. Clicking 'save' in the parking module in TOAF leads to the same result. Ignition off means repeating the above steps.

There aren't any fault codes. Should I be able to see anything using live data in TOAF? There's nothing there. Also, when trying to restore the backup, TOAF says the backup is not intended for the parking aid's module, which it is. Would this indicate a faulty ECU?
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Old 25th May 2023, 17:02   #27
timon
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Since the problem I had is mentioned numerous time on this forum and always remained without a solution, I went for a simple yet hacky approach to solve it and keep the OEM system in place.

We know that the parking aid would come to life after either disconnecting the white plug on the PDC ECU or clicking save in TOAF with the ignition on. It seems that the system needs some kind of re-registration of the sensors every time the ignition is turned on. If something can be triggered manually, it can also be done automatically.

All the wires on the white connector come from the sensors. There is a brown one for each sensor. Those are the positive 12 volt wires. I cut these close to the connector and bundeled all 4 wires (on the side coming from the sensors) together and connected those to the green/brown wire for the reverse light. By doing this, the sensors are powered only when the car is put in reverse instead of being powered all the time as soon as the ignition is turned on. This will re-register the sensors every time necessary and keep the system functioning, even after turning the ignition off/on.

Should there be any problem, fuse 41 for the reverse light and cruise control will blow, but for me this has been working perfectly.

This is a picture of how it works before tidying the harnesses up:

Last edited by timon; 25th May 2023 at 18:36..
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