Parking Sensor Failure 2 Red lights

Discussion in 'Electronics' started by bh13coupe, Sep 3, 2012.

  1. bh13coupe

    bh13coupe Hardcore MB Enthusiast

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    Hi Guys

    My Parking sensors have ceased to operate, I get just 2 red lights on each side (front and back) no amber colours. The sensors don't seem to be seeing anything. Could this be a single sensor failure (would this affect front and back?) or the parking sensor control module?
    I have had no bumper damage and there isnt a towbar fitted.
    thanks

    Paul
     
  2. Paul/

    Paul/ Hardcore MB Enthusiast

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    Joined:
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    Car:
    CLS 320cdi
    in case you don't have the relevant documentation:

    Parktronic system malfunction​
    There is a malfunction in the Parktronic system,
    if only the red distance segments illuminate
    and an acoustic warning sounds. The
    Parktronic system will automatically switch
    off after 20 seconds and the indicator lamp​
    2 ​
    in the Parktronic switch 1 comes on.

    X ​
    Have the Parktronic system checked at an
    authorized Mercedes-Benz Center as soon
    as possible.
    If only the red distance segments illuminate
    and no acoustic warning sounds, the Parktronic
    system sensors are dirty (e.g. dirt, ice,
    snow and slush) or there is an interference
    from other radio or ultrasonic signals (e.g.
    truck air brakes, car wash, or jackhammers).
    The Parktronic system will automatically
    switch off after 20 seconds and the indicator
    lamp in the Parktronic switch comes on.

    X ​
    Switch off the ignition.

    X ​
    Clean the Parktronic system sensors
    (
    Y page 244).

    X ​
    Switch on the ignition.
    or

    X ​
    Check the Parktronic system operation at
    another location to rule out interference

    from outside radio or ultrasonic signals.
     
  3. OP
    OP
    bh13coupe

    bh13coupe Hardcore MB Enthusiast

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    Paul

    Thanks for the info, looks like the latter reading above, 2 lights and no sound. Although the car is pretty clean and hasn't been near any mud or slush.
     
  4. trenny

    trenny New Member

    Messages:
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    Aug 29, 2012
    Car:
    Kia Sedona 2.9
    I have the same problem. all 4 red lights come on with a beep, then nothing and it goes off in 20 seconds. The car is very clean and nothing interfering.

    Did you manage to find out what was the cause?

    Thanks
     
  5. Nastynick

    Nastynick Active Member

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    I have the same problem with my S210. I'm reluctant to take to the Stealership...
     
  6. OP
    OP
    bh13coupe

    bh13coupe Hardcore MB Enthusiast

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    The problem has self rectified itself :wallbash::wallbash: for the moment. I canly assume it has something to do with moisture that had since cleared. I am watching it closely to see if there is a pattern should it happen again.
     
  7. BTB 500

    BTB 500 MB Club Veteran

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    Car:
    R129 SL500, W639 Vito 120, S203 C230
    I used to get this occasionally on the Vito, typically when wet/raining.

    It gradually got more frequent ... in the end it needed a sensor replacing (done under warranty).
     
  8. Watchcame430

    Watchcame430 Hardcore MB Enthusiast

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    1994 SL500 and 2003 Designo S500
    I am all red front and rear plus noise. Took it to Mercedes and they don't really know how to use Star but did think it was because they are not seated correctly.
    I am assuming it is because they are not dead centre in each hole?

    Anyone experienced similar? Thanks
     
  9. dansthyarra

    dansthyarra New Member

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    I had the same problem... two red lights on each side before the system shut down... then read a couple of the posts here...
    I gave the sensors a wash with light detergent and water... after which the system worked perfectly again!
    They appeared clean in the first place... the car is never 'dirty'... so happy!!!
    This may not solve the problem for everyone, but it certainly saved me an expensive trip to the Mercedes service centre. :)
     
  10. Fixiebob

    Fixiebob New Member

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    Car:
    2007 E Class cdi 220 elegance
    I have this problem on my 2007 E Class, red lights then switches off, tried cleaning them to no avail.
    Has anyone ever taken it to dealer and got it fixed and how much was it.
     
  11. Bri

    Bri Hardcore MB Enthusiast

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    The dealers charge £78 for a sensor £15 for the paint plus 1 hours labour.
    You can buy one from ebay for £15 but iv had no success with theses, the last one I did I got from the MB and put it on my self not to difficult to do.
    The sensors seem to be a weak point iv gone through 3 in 2 years:(
     
  12. Kula

    Kula New Member

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    Location:
    Ashford, Middlesex
    Car:
    Mercedes ML270CDI
    I had the same problem on my ML. Got cheap Mechanics Stethoscope and checked them all. Rear left one turned out to be quiet not ticking when you bring stethoscope probe near to it. Replaced it with Bosch from amazon seller and all working fine.

    When checking make sure ignition is on and for rear ones the gear stick must be in reverse. The ticking sound is very clear when using that tool so if there is no noise then it is faulty. One faulty sensor will disable the whole system.
     
  13. E270 Owner

    E270 Owner Hardcore MB Enthusiast

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    Sensor alignment is critical, if the bumpers been hit or there's moisture getting in it will put 4 red lights up and a beep.

    Sometimes there's damage to the sensor housing from impact but visually looks ok from the exterior.

    Star can check the sensors and pinpoint which ones causing the fault.
     
  14. nigel cross

    nigel cross Hardcore MB Enthusiast

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    Unfortunately I cannot put my ML into reverse with the engine off so I cannot try this method.
     
  15. babaroga

    babaroga Member

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    Aug 10, 2009
    Car:
    GL 420CDI
    Hmm, similar problem after my car has been left in the rain for a whole day. Done 1000 miles or so over last weekend with no issues.

    I do have 2 reds each side on the front without any sound. I'll give it a wash with Karcher first and if nothing happens, shall look to replace faulty.

    One question though, do all sensors come only in black and require painting, or you can order required colour match for the car?
     
  16. b1g1an

    b1g1an Hardcore MB Enthusiast

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    You can, there's a release button near the stick that's there so the car can be put into neutral for towing. Check your handbook for how yours works.
     
  17. V8 Supercharger

    V8 Supercharger Hardcore MB Enthusiast

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    If you start the ML up, put it into Neutral and then turn it off again, then im sure you can push it into reverse with just the ignition lights on. Mine will do that.
     
  18. V8 Supercharger

    V8 Supercharger Hardcore MB Enthusiast

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    My car did this for a little while on the front sensors for abit last year. Then its been alright after i replaced a sensor about 6 months ago, now its started doing the same thing again from time to time.

    Only the red lights come on with a beep, then it all shuts down. Reverse parking has become a pretty scary thing.
     
  19. dddooommm

    dddooommm Hardcore MB Enthusiast

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    South West England
    Car:
    R129, W124, w209
    This all started happening to me as soon as i installed an aftermarket headunit with bluetooth handsfree/ audio player. Seems to me that this interfeers !
     
  20. dodd1980

    dodd1980 Active Member

    Messages:
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    Aug 19, 2012
    Location:
    Weston-Super-Mare
    Car:
    CLS55
    i have this same problem, i replaced all the front sensors then it worked fine for a couple of days and now it's started again.

    Getting very frustrating now
     

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