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S203 c270cdi

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by motorsiklemad, Feb 13, 2018.

  1. motorsiklemad

    motorsiklemad New Member

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    Your Mercedes:
    C Class / 2005 / 270cdi
    I have a 2005 S203 c class 270cdi which I am having problems with the fog lights not working when switched on using light switch. Does any one on here know the procedure for testing the light switch? Parking lights work, side lights work,dip and high beam also work fine. Just the fog lights front & rear that are not working.
     
  2. mersum1es

    mersum1es Senior Member

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    Your Mercedes:
    W210/-01/270CDI, W220/-01/320CDI, EX:W211/-04/320CDI
  3. OP
    motorsiklemad

    motorsiklemad New Member

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    The Fog Lights do not have a FUSE allocated to them they are controlled through the SAM unit attached to the fuse box. I also know that there is not a wiring problem as the front Fog Lights work when I lock the car so bulbs etc are fine. I'm thinking I need to test the light switch, just can't seam to find the information that I need
     
  4. mercedes13156

    mercedes13156 Senior Member

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    Your Mercedes:
    CLK 200 Cabrio and a Ford Kuga
    The easiest way I can think of testing the switch is by putting the car on diagnostics and testing the function of the light switch. If I recall correctly, you can see all of the switches on live data and it shows something like.....

    Circuit Name and "Activated / Not activated" when you turn the switch.
     
  5. LostKiwi

    LostKiwi Senior Member

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    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500, 04 Smart Roadster Coupe
    Correct. The only other way is trial and error with a multimeter....
     
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  6. mercedes13156

    mercedes13156 Senior Member

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    Your Mercedes:
    CLK 200 Cabrio and a Ford Kuga
    After having dismantled the car to get it out and released enough cable to turn it over so you can get the probes in. That in itself is worth the cost of a session.
     
  7. mersum1es

    mersum1es Senior Member

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    Your Mercedes:
    W210/-01/270CDI, W220/-01/320CDI, EX:W211/-04/320CDI
    oops sorry, was thinking W210 fogs... there they are fused, and in addition there is some resistor kind of element before front fogs which brittle in time... W203 it might be light switch related, it should be not difficult to take apart and check wirings
     

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