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Old 19-05-2008, 04:22 PM   #1
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parking sensors

At the GTG yesterday I was asked if my car had been reliable. I answered "yes" and that of course has tempted the fates!

The parking sensors have gone haywire:

In either reverse or forward the alarm and sensor goes off with 2bar up on engaging gear if I'm near something. No distance changes. The sensor turns itself off after about 15secs and the off light is then showing on the centre console;same both front and back. I have cleaned the round sensors on the bumper but to no avail


Any ideas?
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Old 19-05-2008, 04:30 PM   #2
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If the system shuts itself off then its gonna be a fault with the car but just to be sure does this happen wherever you take the car (pneumatics near by can drive it mad).

Otherwise your probably looking at a sensor, a DAS should give you an idea.
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Old 19-05-2008, 04:31 PM   #3
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Quote:
Originally Posted by carnut View Post
At the GTG yesterday I was asked if my car had been reliable. I answered "yes" and that of course has tempted the fates!

The parking sensors have gone haywire:

In either reverse or forward the alarm and sensor goes off with 2bar up on engaging gear if I'm near something. No distance changes. The sensor turns itself off after about 15secs and the off light is then showing on the centre console;same both front and back. I have cleaned the round sensors on the bumper but to no avail


Any ideas?
This sounds like a module fault, if the rear lights up when in D then could be a water issues its right under the water leak area

http://www.detali.ru/cat/oem_mb2.asp...SGR=610&SGN=22
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Old 19-05-2008, 05:43 PM   #4
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Malcolm,on another thread you wrote:

The sensor face resonates at 22khz with paint on the face it cant, its OK to paint the outer ring but not the center

Could I have put too much wax polish on the bumper?

The 2 bar up audible warning on seems to be a common problem when things go wrong with the system,

PS took a look around the control unit area and no signs of damp
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Old 19-05-2008, 05:51 PM   #5
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Malcolm,on another thread you wrote:

The sensor face resonates at 22khz with paint on the face it cant, its OK to paint the outer ring but not the center

Could I have put too much wax polish on the bumper?

The 2 bar up audible warning on seems to be a common problem when things go wrong with the system,

PS took a look around the control unit area and no signs of damp
I'm not Malcolm but if i can give that question a shot.

I think you would be hard pressed to get enough wax onto them to cause the problem.
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Old 19-05-2008, 06:10 PM   #6
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I'm not Malcolm but if i can give that question a shot.

I think you would be hard pressed to get enough wax onto them to cause the problem.
And I am not Dan My reason for saying that its the control I think is because the sensors go into the input side, and I cant see how a sensor can turn on both displays.
As my car is out I will just take a peep at mine, as I have never looked back when going forward, and do not look forward to going back, I will post again in a bit
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Old 19-05-2008, 06:12 PM   #7
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haha.

I wasn't dis-agreeing with you mate, my post was just about the wax being the problem.
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Old 19-05-2008, 06:17 PM   #8
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haha.

I wasn't dis-agreeing with you mate, my post was just about the wax being the problem.
I could never disagree with you
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Old 19-05-2008, 06:21 PM   #9
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From reading thru the other threads on this subject it would appear trhat STAR could tell if it was a sensor or the control. I will see who has a STAR near me.

Thanks for all your input. I will wait for tomorrow to see if the problem goes away ( some hope, but they do sometimes) and if not take the above Star route.

By the way when I came home yesterday from the GTG, as I raised my hood I opened the glove box at the same time to stow something and the hood froze. Switch off ignition and then on and it's worked OK since....another electrical mystery? Cant reproduce that fault so its at least one thats gone away!
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Old 19-05-2008, 06:36 PM   #10
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From reading thru the other threads on this subject it would appear trhat STAR could tell if it was a sensor or the control. I will see who has a STAR near me.

Thanks for all your input. I will wait for tomorrow to see if the problem goes away ( some hope, but they do sometimes) and if not take the above Star route.

By the way when I came home yesterday from the GTG, as I raised my hood I opened the glove box at the same time to stow something and the hood froze. Switch off ignition and then on and it's worked OK since....another electrical mystery? Cant reproduce that fault so its at least one thats gone away!
Always take off the neg the battery for 5 mins, there are no problems in doing this on your car, see if it re sets
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Old 19-05-2008, 06:45 PM   #11
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By the way when I came home yesterday from the GTG, as I raised my hood I opened the glove box at the same time to stow something and the hood froze. Switch off ignition and then on and it's worked OK since....another electrical mystery? Cant reproduce that fault so its at least one thats gone away!
Welcome to the weird and wonderful world of Mercedes-Benz electrics
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Old 19-05-2008, 06:55 PM   #12
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Always take off the neg the battery for 5 mins, there are no problems in doing this on your car, see if it re sets
Which battery ? Front or boot domestics?
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Old 19-05-2008, 07:20 PM   #13
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Which battery ? Front or boot domestics?
In the boot sir, the front is starter only
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Old 20-05-2008, 12:29 PM   #14
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Always take off the neg the battery for 5 mins, there are no problems in doing this on your car, see if it re sets
Just for the record unfortunately this did not work.Thanks anyway.

Awaiting call from MB...and waiting,and waiting,and waiting.....

And the call came!,MB Oxford are going to do a STAR test to see whats what tomorrow at no charge. Now thats good enough to put on the Forum!!

(well it was only serviced 10 days ago)

Last edited by carnut; 20-05-2008 at 04:06 PM.
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Old 20-05-2008, 05:19 PM   #15
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It certainly is,, if you take out the plug for the front and then rear sensor you will have the answer
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