[SOLVED] w202 c43 Xenon lights

Discussion in 'Electronics' started by DRBC43AMG, Sep 14, 2014.

  1. DRBC43AMG

    DRBC43AMG Hardcore MB Enthusiast

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    Can someone tell me what the plug is for? My left light (passenger side LHD) has stopped working (blown bulb?) as has been playing up since several months.
     

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  2. Alps

    Alps MB Club Veteran

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    Leveling motor?
     
  3. gurpz

    gurpz Administrator Staff Member

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    Yup that plug is for the levelling motor. Try swapping the Xenon bulbs from each headlight to see if its a bulb or ballast/ignitor issue.
     
  4. OP
    OP
    DRBC43AMG

    DRBC43AMG Hardcore MB Enthusiast

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    Thanks. Douh I didn't think of swaping sides to see. I'll check tomorrow and come back with the test results.
     
  5. OP
    OP
    DRBC43AMG

    DRBC43AMG Hardcore MB Enthusiast

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    OK swapped bulbs and the dead bulb is alive on the other side. So I guess that the ballast/igniter is in the books to be changed. Is this an expensive part to buy?
     
  6. andy27168

    andy27168 Hardcore MB Enthusiast

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    Hi,
    There are two other items which can fail, ignitor which is in the headlight, and the ballast, I would now swap the ballasts from one side to the other. The ballast unit for the left hand side is behind the left side front wheel arch lining, and plugs directly into the back of the headlight, pic below of the ballast in position in left side wheel arch, the ballast is the item with the yellow label on it.
    [​IMG]

    The right hand ballast is fitted to the chassis rail under the headlight, pic below, again the ballast in this pic has the yellow label on it.
    [​IMG]

    The ballasts are the same unit except they have different brackets on them, and they simply plug in the back of the headlight.
    Pic below shows the ballasts with the different brackets on them.
    [​IMG]
     
  7. OP
    OP
    DRBC43AMG

    DRBC43AMG Hardcore MB Enthusiast

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    Thanks for the tip. I'll continue with some testing to pin point the faulty part.
     
  8. Alps

    Alps MB Club Veteran

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    early audi TT ballasts are also the same but with a slightly shorter wire, i had audi balasts when i converted my c36 to c43 xenon headlight clusters
     
  9. gurpz

    gurpz Administrator Staff Member

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    This is true but IIRC the wire pin outs are in a different order so check this. In actual fact though you can actually even swap the ballasts themselves over with your existing wires only 3 screws hold it in place to the harness and metal bracket as shown in the pictures Andy has attached. Early BMW and a few VAG group cars use the same ballast but with different brackets and wire configurations.
     
  10. andy27168

    andy27168 Hardcore MB Enthusiast

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    As far as I am aware the ballasts for the 202 are also the same as S class and SLK, except that those cars do not have the cable assembly. But all you have to do is remove your bracket off of your broken ballast, unplug the loom, and refit it to the new ballast.
    Check out this link, and from comparing my pic and the pic in the ebay auction you can see that they are the same. Also by doing a search on E-bay using the Bosch pt. no. you can see in my pic, it comes up with this,
    AL BOSCH Xenon Ballast Mercedes S-Class Coupe C215 W215 SLK R170 1307329023 39 u | eBay
     
  11. OP
    OP
    DRBC43AMG

    DRBC43AMG Hardcore MB Enthusiast

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    Top stuff Andy. Thanks!
    By the way and I haven't checked yet but will do so tomorrow, but should this problem throw an error code in the electronics which could be read with the appropriate scanner?
     
  12. andy27168

    andy27168 Hardcore MB Enthusiast

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    It might throw up a code to say the light isn't working but it wouldn't be anymore specific, you would still need to go through replacing/swapping parts around.
    I found a source of new bits, and info in the link below
    Mercedes-Benz C-Class W202 C36 C43 C55 AMG Headlight Fault HID Ballast Bulb Ignitor Replaced
    Please keep in mind the ballast units MB Pt. No.'s are different only because of the brackets being different between the left and right, and the cable loom. The Bosch Pt. No. is the number for the ballast without bracket and wiring loom, but as I have said you can remove your bracket and loom and fit to the new ballast.
     
  13. OP
    OP
    DRBC43AMG

    DRBC43AMG Hardcore MB Enthusiast

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    I double checked and have now concluded that the bulb is indeed dead. In fact it was rattling a bit at the base and finally the tube broke when I manipulated the thing. I swapped the good bulb and both sides work. I'll be ordering a new bulb, or probably will get two so to install new ones on both sides.

    I did read the error codes and found none pertaining to the xenon light. However, I did find the following:
    P0100 Powertrain - Mass or volume air flow sensor (MAF I assume....)
    P0500 Powertrain - Vehicle speed sensor
    P0150 Powertrain - O2 sensor circuit, bank2 sensor1

    I have been feeling the engine hesitating a second or two when accelerating from slow speed. Other than that, everything seems to work perfectly. I will try cancelling the codes, drive around a bit before checking again.

    Any other ideas?
     
  14. OP
    OP
    DRBC43AMG

    DRBC43AMG Hardcore MB Enthusiast

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    A quick update...
    I ordered and changed my MAF with a new Bosch unit and installed the new xenon bulbs (Osram Cool Intense) to both sides and reconnected the stray levelling plug. Before going out for a drive I also cleared the error codes. After having driven around for a little while, I came back and checked the error codes. None registered in the ECU so I'm now happy. Also very happy to say that with the new MAF she now pulls like an express train :rock:
     

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    Last edited: Sep 30, 2014

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