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Parking sensors

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Parking sensors

Postby Ratty » Mon, 18 Feb 2008 19:51:38 UTC

Does any one know how to bench test parking sensors? Mine is an e39 model. Thanks.
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Postby slim_boy_fat » Mon, 18 Feb 2008 20:37:36 UTC

Why would you want to bench test when it can be done in situ?

Ignition on, car in reverse then get your ear to each in turn. If you can hear a very faint clicking sound, the sensor's working.

Do a search, there's loads of info re PDC on the site.

BTW, welcome to the forum.
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Postby dmar573 » Tue, 19 Feb 2008 08:15:34 UTC

is it just one click, or is it a series of clicks?
my pdc light on the dash comes on and starts flashing when i put it in reverse along with a 3 second beep. Does this mean that the whole PDC system is knackered? no beeping at all when i get close to a wall either front or rear
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Postby Ratty » Tue, 19 Feb 2008 09:12:46 UTC

I bought the car with the sensors not working- the previous owner had given up on them. I aquired a good sensor and replaced them one at a time, and I still have a fault. My ears aren't that good, but I can't hear any of them click. So, back to my question; how do I test them. Surely can't be that difficult?
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Postby minesavolvo » Tue, 19 Feb 2008 09:14:41 UTC

dmar573 wrote:is it just one click, or is it a series of clicks?
my pdc light on the dash comes on and starts flashing when i put it in reverse along with a 3 second beep. Does this mean that the whole PDC system is knackered? no beeping at all when i get close to a wall either front or rear
e39 2003


Constant clicking - If 1 out of your 8 fails, then the whole system is disabled.
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Postby slim_boy_fat » Tue, 19 Feb 2008 15:26:44 UTC

Dealer's diagnostics can identify which is/are faulty. If you're prepared to fork out for them to do it.
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Postby marconi » Wed, 20 Feb 2008 00:08:35 UTC

Alternatively, get a 16 year old to listen and tell you whcih are not clicking...like I did!

1 gone, 1 weak.
replaced the goner with 1 from Evilbay (get the same part number or equivalent).
The weak one went, so got 2 more off evilbay.

will swap them out his weekend.
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Postby E39mad » Wed, 20 Feb 2008 10:53:34 UTC

Once swapped keep the pressure washer off them - tends to kill them!
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Postby Harry » Wed, 20 Feb 2008 11:33:14 UTC

If none are clicking, even with a replacement in situ consider two things.

Try another pair of ears (but don't attempt to detatch them from the person lending them).

The posibility that the sensors are OK and the fault lies further back in the wiring.

Good luck with it.

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Postby dmar573 » Wed, 20 Feb 2008 20:47:25 UTC

ok
so i now have wet manky knees from crawling around the car. all click except the two center rear ones. Whats confusing is that before this i was getting the 3 beep warning of a problem on the fronts intermittently. What are the chances of two rear ones going at the same time?
Also, according to fleabay, there only seems to be two types. fronts and rears.is this correct? how do i know which part numbers are fitted to mine? are they easy to replace? (rear centers)
03 e39 530d sport

sorry for all the questions, but i will need to re morgage my house and sell the cat to proctor and gamble if i have to go to the dealer for this.

this is on the back of hitting the roughcast corner of the garage with the rear wheel arch which is going to cost a couple of hundred quid to fix too. So saa lhe sat nav and parking sensors dont seem able to compensate for a tool at the controles :(
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Postby marconi » Thu, 21 Feb 2008 12:12:24 UTC

Go to realoem http://www.realoem.com/bmw/select.do?vin=&kind=P&arch=0
put in the last 7 digits of your VIN and search for the distance measuring equipment park distance sensor.
The front and back are a different shape, get the right ones.

Go to evilbay and see if someone is selling one (or two), whatever you need.
The ones I got are a superceded part number and the sensor centres are round rather than cats eyed, but they work fine. I checked with realoem that they were equivalent and they did fit and work.

There are 3 pin and 2 pin versions.
I think the 3 pin are the modern ones and your car is younger than mine.
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Postby Ratty » Thu, 21 Feb 2008 14:44:17 UTC

Right. I can hear the clicking now. One is much louder than the others and the sensors are starting to work occasionally. Thanks to all.
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Postby marconi » Sun, 24 Feb 2008 20:35:47 UTC

Both dodgy rear sensors (1 busted, 1 weak) replaced.
PDC now working fine.

:D
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Postby dmar573 » Fri, 29 Feb 2008 08:20:15 UTC

hi
bought 4 rear parking sensors.I only need 2 at the moment. Has anybody tried fitting the ones designed for the rear to the front?
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Postby marconi » Fri, 29 Feb 2008 12:18:43 UTC

From REALOEM and the Evilbay pictures, the rear are designed for inline connection and the front for 90 degree connection, I can only assume that this is because of space restrictions behind each bumper. The right angled front ones wouldn't fit the rear AND be able to clipped into the holder.

Electrically, I think they are the same, physically you might be stuffed getting them to fit.
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