rear parking sensors not working

nuddlez4 · Post by **nuddlez4** » Thu Sep 08, 2022 11:47 am

After nearly hitting something very hard I realise the sensors aren't doing anything No beep no buzz no nothing dead The reversing lights still come on when in reverse but everything else does diddly squat Any body out there with any ideas Would a carly investigation tell me what's wrong?

Any help would be great

HGoward · Post by **HGoward** » Thu Sep 08, 2022 11:50 am

Does it do a long beep when you put the car in reverse?
Can you hear all the sensors making the sonic ticking when in reverse?
If you can't hear one of them that tells you which one needs replacing. I had this problem on my coupe and just ordered the part on ebay, and got a local garage to fit it for me, and problem was solved with parking sensors working perfectly again.

nuddlez4 · Post by **nuddlez4** » Thu Sep 08, 2022 11:58 am

No nothing no beep no nothing just silence

coldel · Post by **coldel** » Thu Sep 08, 2022 2:00 pm

Just some thoughts. Is the speaker working that makes the noise? Have you tried swapping out the PDC for another used one (can be had from ebay for about 20 quid)

nuddlez4 · Post by **nuddlez4** » Thu Sep 08, 2022 4:43 pm

There is no vibration on any of the sensors so I guess that the PDC could be goosed Will try and get a replacement from ebay and see what happens

nuddlez4 · Post by **nuddlez4** » Sat Oct 22, 2022 10:01 pm

swapped the pdc control unit in the boot and now have clicking from all 4 sensors but not a beep from the speaker Removed the speaker from the footwell under the steering wheel Is there a way to test the speaker to see if it's dead

spammy · Post by **spammy** » Sat Oct 22, 2022 10:16 pm

new sensors and new module sorted it for me beeps on all sensors

Gollom122 · Post by **Gollom122** » Mon Oct 24, 2022 10:23 pm

Plug a code reader in and check live data.
A creator c310+ is about £50. You’ll need someone to help while reading the data streams. Get them to walk up to each sensor holding a board. They kick in when 2m away and should move up and down accordingly.
I had 2 faulty ones when I got the car. One was dead and one detected and stuck straight to 0 even when you walked away.
You can also test with esta and inpa if you know anyone with the bmw diags.

nuddlez4 · Post by **nuddlez4** » Tue Oct 25, 2022 4:20 pm

thanks gollom 122 will go to my local indi who can do this for me

nuddlez4 · Post by **nuddlez4** » Fri Oct 28, 2022 6:07 pm

Hi spammy did you fit genuine bmw sensors or get them from ebay

spammy · Post by **spammy** » Sat Oct 29, 2022 2:10 pm

hi nuddlez4 got them on ebay 29.99

Gollom122 · Post by **Gollom122** » Sat Oct 29, 2022 4:45 pm

Got mine eBay used genuine £10 each. Make sure you get the right ones as there are subtle differences between models.

Obicoke · Post by **Obicoke** » Mon Jan 09, 2023 11:03 am

HGoward wrote: ↑Thu Sep 08, 2022 11:50 am Does it do a long beep when you put the car in reverse?
Can you hear all the sensors making the sonic ticking when in reverse?
If you can't hear one of them that tells you which one needs replacing. I had this problem on my coupe and just ordered the part on ebay, and got a local garage to fit it for me, and problem was solved with parking sensors working perfectly again.

my car did do the long beep like you mentioned when I put it into reverse, but now doesn't do that. Do you know what the problem might be?

HGoward · Post by **HGoward** » Mon Jan 09, 2023 11:17 am

Obicoke wrote: ↑Mon Jan 09, 2023 11:03 am
HGoward wrote: ↑Thu Sep 08, 2022 11:50 am Does it do a long beep when you put the car in reverse?
Can you hear all the sensors making the sonic ticking when in reverse?
If you can't hear one of them that tells you which one needs replacing. I had this problem on my coupe and just ordered the part on ebay, and got a local garage to fit it for me, and problem was solved with parking sensors working perfectly again.
my car did do the long beep like you mentioned when I put it into reverse, but now doesn't do that. Do you know what the problem might be?

If there is no longer a long beep, and you can't hear the sensors ticking when listening to them. I would put money on it being the module itself now. And you could possibly have a dead sensor too if it initially did the long beep.

Gollom122 · Post by **Gollom122** » Mon Jan 09, 2023 11:48 am

Get a code reader. The creator c310+ is £50. You can read live data and test the sensors by having someone hold a plank of wood and approach each sensor individually.
I had 2 faulty ones (1 permanently on and 1 that stuck and didn’t release). I’d never have found that fault by the listening method.

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