BMW: Rear parking sensors not working : BMW 3 series Forum • BMWLand

  BMW Forum: Car help, questions, answers, BMW discussion forum  
BMW Forum for UK BMW Car owners : Where Power Meets Control

BMW Forum: BMWLand Forum Portal Entrance BMW Forum: BMWLand - Forums for UK BMW Owners BMW Discounts & Support for BMWLand members BMW Forum Twitter, RSS, Facebook for BMWLand members BMW Car Insurance Discount BMWLand: Contact Us BMW Paint Repair discounts for BMWLand members BMW Oil Discount for BMW Engines BMW Car Tyre Discounts for BMWLand Members BMW Car Parts: Genuine BMW Parts Discount for BMWLand Members BMW ECU mapping BMW Swirl Flaps

www.BMWLand.co.uk ©2014                           Contact [email protected]

Peake BMW Diagnostics  
BMW Car Insurance Discount
  
  

Rear parking sensors not working

BMW forum 3 series car: E21, E30, E36, E46, E90, E91, E92, E93, F30, F31, F34, F35

Moderator: Moderators

Rear parking sensors not working

Postby m44 » Fri, 11 Feb 2011 17:33:31 UTC

Hi All,

320d Touring sport E46 on a 05 Plate, rear parking sensors do not seem to work! They make a sound when i put the car in reverse, and then no matter how close i get to an object,no sound at all! Any ideas? There are some small signs of a rear hit to the Bumper, not that bad though!

Thanks
m44
User

Posts: 98
Joined: Mon, 28 Jan 2008 22:27:24 UTC

Re: Rear parking sensors not working

Postby slim_boy_fat » Fri, 11 Feb 2011 21:52:03 UTC

What kind of sound are they emitting on selecting reverse?

Do a forum search, there are LOADS of threads/replies on this subject.
Never underestimate the power of thrawn.
slim_boy_fat
BMW Warlord
Site Supporter

User avatar

Posts: 25074
Joined: Mon, 04 Aug 2003 18:53:54 UTC
Location: Scottish Highlands
Scotland (SC)

Re: Rear parking sensors not working

Postby mjg » Sat, 12 Feb 2011 00:05:58 UTC

m44 wrote:Hi All,

320d Touring sport E46 on a 05 Plate, rear parking sensors do not seem to work! They make a sound when i put the car in reverse, and then no matter how close i get to an object,no sound at all! Any ideas? There are some small signs of a rear hit to the Bumper, not that bad though!

Thanks


Both the BM's I have had do this from time to time - normally after a long run on a wet day with lots of spray and muck kicking up from the road.

Normally I just give them a wipe over and that sorts it.
2004 BMW 320 Ci M-Sport auto - gone but not forgotten.
2009 Mazda MX-5 1.8i. - Jan's
mjg
Overdrive

User avatar

Posts: 492
Joined: Wed, 18 Dec 2002 00:52:08 UTC
Location: East Cleveland UK (where the men are men and the sheep are nervous)

Re: Rear parking sensors not working

Postby m44 » Sun, 13 Feb 2011 12:24:08 UTC

Hi Slim_boy_fat

The sound i get when i put the car in reverse is just one continus bleep which lasts about 5 seconds after that i get no sound at all no matter how close i get to an object ! What do you think?

Thanks
m44
User

Posts: 98
Joined: Mon, 28 Jan 2008 22:27:24 UTC

Re: Rear parking sensors not working

Postby slim_boy_fat » Sun, 13 Feb 2011 13:09:14 UTC

As mjg says it could just be dirt, but iirc the single tone followed by nothing is a sensor failed.

Put the car in reverse with the ignition on [engine NOT running :lol: ] and put your ear close to each sensor in turn, you should hear a clicking sound - if no sound is audible it's an indication that that sensor is down. :(
Never underestimate the power of thrawn.
slim_boy_fat
BMW Warlord
Site Supporter

User avatar

Posts: 25074
Joined: Mon, 04 Aug 2003 18:53:54 UTC
Location: Scottish Highlands
Scotland (SC)

Re: Rear parking sensors not working

Postby m44 » Sun, 13 Feb 2011 18:31:20 UTC

Hi,

I have done that, and no nise from the sensors at all! Any idea what to do about the sensor? When you say sensor, Are we talking about the ones on the Bumper? If so any idea as to how to get the out etc?

Thanks
m44
User

Posts: 98
Joined: Mon, 28 Jan 2008 22:27:24 UTC

Re: Rear parking sensors not working

Postby m44 » Sun, 13 Feb 2011 18:44:41 UTC

Hi slim_boy_fat,

Is there a possibility that my PDC control unit maybe faulty? If so, do you have any idea where in the car it is located? Or should i stick to the sensors for now? I need to start taking things apart, and i could do with some basic info as to where to start!

Thanks
m44
User

Posts: 98
Joined: Mon, 28 Jan 2008 22:27:24 UTC

Re: Rear parking sensors not working

Postby sjj84 » Sun, 13 Feb 2011 20:01:47 UTC

It's a possibility, I had to have my control unit replaced, was done under warranty though so no idea on costs or how to do it.
sjj84
BMW Warlord

User avatar

Posts: 1235
Joined: Fri, 16 Sep 2005 18:04:08 UTC
Location: Now an Ashford Resident!

Re: Rear parking sensors not working

Postby slim_boy_fat » Sun, 13 Feb 2011 22:39:55 UTC

When I had the problem, it turned out that 2 sensors had failed. Afraid I can't help about where the control module hides, but I'm sure someone with greater knowledge will be along to help further.
Never underestimate the power of thrawn.
slim_boy_fat
BMW Warlord
Site Supporter

User avatar

Posts: 25074
Joined: Mon, 04 Aug 2003 18:53:54 UTC
Location: Scottish Highlands
Scotland (SC)

Re: Rear parking sensors not working

Postby m44 » Sun, 13 Feb 2011 23:42:24 UTC

Can anyone tell me the fact that i get a continus sound for about 5 seconds when i engage in reverse, does it mean the control unit is ok, and fault is with the Sensors in the bumper?
m44
User

Posts: 98
Joined: Mon, 28 Jan 2008 22:27:24 UTC

Re: Rear parking sensors not working

Postby silverblack » Mon, 14 Feb 2011 02:08:55 UTC

m44 wrote:Can anyone tell me the fact that i get a continus sound for about 5 seconds when i engage in reverse, does it mean the control unit is ok, and fault is with the Sensors in the bumper?


Mine did that turned out one of the sensors was faulty or so i thought.Must have been a loose wire tho as one day they just started working again.
Stick the car in reverse ingition on and listen to each sensor you should hear clicking from each sensor.
BMW 120D M-Sport Coupe
silverblack
Intermediate

User avatar

Posts: 187
Images: 5
Joined: Sat, 04 Nov 2006 10:47:04 UTC
Location: Scotland
Scotland (SC)

Re: Rear parking sensors not working

Postby silverblack » Mon, 14 Feb 2011 02:10:26 UTC

no edit button already been suggested by slim did you try it ?
BMW 120D M-Sport Coupe
silverblack
Intermediate

User avatar

Posts: 187
Images: 5
Joined: Sat, 04 Nov 2006 10:47:04 UTC
Location: Scotland
Scotland (SC)

Re: Rear parking sensors not working

Postby GSB1 » Mon, 14 Feb 2011 07:20:43 UTC

While there are many topics discussing faults and asking questions, I haven't found any clearly covering the removal of the sensors. I have asked a fresh question here if anyone can help please:

viewtopic.php?f=4&t=118072
Graham
GSB1
User

Posts: 48
Joined: Sun, 20 Jul 2008 18:42:55 UTC

Re: Rear parking sensors not working

Postby verbarthe » Mon, 14 Feb 2011 08:06:46 UTC

If you ve listened to the sensors and none are ticking, yet still get the continuous bleep , then it could very well be that a two or more sensors have gone . Have you power washed your car recently with a pressure washer or similar ? Never pressure was your sensors as this can kill them off instantly . Sometimes a good clean and dry out gets them working again try cleaning them in situ and drying them out with a hairdryer , they re pretty sensitive things and sometimes dirt and moisture get trapped and cause the problem you have.
If cleaning and drying them does nt work then it s replacement, and afaik the bumper has to come off to do this , as access is nt exactly easy , hope you get on with it ok :)
There are no new Scams , just new ways of presenting the old ones .

Murray
verbarthe
BMW Warlord
Site Supporter

User avatar

Posts: 8545
Images: 4
Joined: Thu, 23 Mar 2006 22:28:32 UTC
BMW Members Cars: BMW 330 CI M Sport Convertible
Location: Buckie Scotland
Scotland (SC)

Re: Rear parking sensors not working

Postby mjg » Mon, 14 Feb 2011 08:55:30 UTC

Just to confirm reading further on (and properly!) - unlikely to be dirt as this normally on mine just results in a continuous tone rather than a tone then off.
2004 BMW 320 Ci M-Sport auto - gone but not forgotten.
2009 Mazda MX-5 1.8i. - Jan's
mjg
Overdrive

User avatar

Posts: 492
Joined: Wed, 18 Dec 2002 00:52:08 UTC
Location: East Cleveland UK (where the men are men and the sheep are nervous)

Re: Rear parking sensors not working

Postby m44 » Mon, 14 Feb 2011 22:27:09 UTC

Hi guys,

I have tried the listening thing on all sensors, none of them make any noise! I think i will try drying them with hair dryer as recomended by verbarth, that might do the job, if not, i be back to get advice on taking the bumper off to get each sensor out and replaced! Cheers for now all.
m44
User

Posts: 98
Joined: Mon, 28 Jan 2008 22:27:24 UTC

Re: Rear parking sensors not working

Postby minesavolvo » Mon, 14 Feb 2011 22:35:19 UTC

Each of the sensors is wired back individually to the controller so I would check that the plug on the controller is mated correctly also check the wiring loom from controller to sensors as this may be damaged.

As you say none are clicking, I would be surprised if hair dryer or WD40 does the trick.

Controller failure seems to be relatively rare but there have been one or two reports of controllers lately :-(
minesavolvo
BMW Warlord
Site Supporter

Posts: 2378
Joined: Thu, 29 Nov 2007 11:47:31 UTC
Location: Reading, Berkshire
England (EN)

Re: Rear parking sensors not working

Postby m44 » Tue, 15 Feb 2011 15:55:51 UTC

Hi minesavolvo,

Any idea where the controller is positioned in the car?

Cheers
m44
User

Posts: 98
Joined: Mon, 28 Jan 2008 22:27:24 UTC

Re: Rear parking sensors not working

Postby minesavolvo » Tue, 15 Feb 2011 16:11:10 UTC

Probably rear drivers side - it's a plastic box - not an exact picture but may get you in the right area - RealOEM Clicky

Described as "behind rear seat backrest in luggage compartment"
Image
minesavolvo
BMW Warlord
Site Supporter

Posts: 2378
Joined: Thu, 29 Nov 2007 11:47:31 UTC
Location: Reading, Berkshire
England (EN)

Re: Rear parking sensors not working

Postby m44 » Tue, 15 Feb 2011 21:14:59 UTC

Thanks! I get on to it.
m44
User

Posts: 98
Joined: Mon, 28 Jan 2008 22:27:24 UTC

Next

  • Forum Topics on BMWLand that may be of intetest to you
    Replies
    Views
    Last Forum post

Return to BMW 3 series Forum

BMWLand: Who is online

Users browsing this BMW forum: Bing [Bot], Yahoo [Bot] and 43 guests