W203 Comand Speed Pulse

Discussion in 'Electronics' started by 142 TPL, Jan 2, 2011.

  1. 142 TPL

    142 TPL Active Member

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    Hi
    I have retrofitted a Comand 2.0 in my 2002 C270 Estate and I cant find the speed pulse wire that is meant to be a blck/green wire taped up in the left sill area. I have located a taped up green / black wire but it is one of a pair the other being a yellow / black both terminating in an unused green plug is this the right wire?
     

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  2. npuk

    npuk MB Enthusiast

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  3. OP
    OP
    142 TPL

    142 TPL Active Member

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    Well now I am confused as that says the connection to the speed pulse is on the drivers side to a green / White wire
     
  4. mr. shr

    mr. shr MB Enthusiast

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    When I did a similar job on my old W208 (APS 30, not full blown COMAND), I found the speed pulse connector block in the passenger door sill (A pillar ??).

    On my CLK there was a blue/green type connector block that had (I think) four wires going in, with only three going out. So I used the spare one for my APS unit.

    Anyway, as a test I jacked up one wheel, connected a volter meter to the spare wire in the connector block and turned the raised wheel by hand. When I saw the voltage pulsing between 0 and 12 ish volts I knew I had indeed found a speed pulse signal.

    You could try similar with the wires you've found.
     
  5. OP
    OP
    142 TPL

    142 TPL Active Member

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    So if I jack the car up put ignition on turn a wheel I should get voltage if it's a speed pulse wire
     
  6. mr. shr

    mr. shr MB Enthusiast

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    Yep.
    Try each on in turn and you should hopefully see a voltage on one of them.
    Turn the wheel slowly.

    There's definitely no other connector block in that sill? You've had a good look down there?
     
  7. OP
    OP
    142 TPL

    142 TPL Active Member

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    That the only one that don't go anywhere and was taped and the right color.
    Is that any wheel ? It's auto so I assume neutral
     
  8. richard

    richard Authorised Forum Sponsor Authorised Forum Sponsor

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    You shouldn't need it on a W203/W209, only on most of the W208/W210 but not all !

    Richard
     
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  9. OP
    OP
    142 TPL

    142 TPL Active Member

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    Thanks Richard it's works a treat without the connection
     

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