Question about Mercedes-Benz CLK

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Just bought parking sensors for 2006 CLK 200. Fitted beautifully, but due to reversing light having bulb-failure sensor, I need to fit a relay. No problem, except WHICH of the 5 wires in the "block" going into the rear light cluster is for the reversing light? Any help MUCH appreciated

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  • Robbin Davies Jan 03, 2011

    Hello there. Thank you for your research - in the old days they gave you a wiring diagram inside the handbook! I was hoping not to have to have the hassle of taking out the back lens to see where the reversing light fits in to the "block", so I'll use your suggestion to try and find a grey/yellow or a grey/blue.

    Whilst I have you, it seems the relay has to have one lead attached (in the trunk) to a permanent + feed from the battery. Well I'm not a complete idiot (!) but I can think of anything in the trunk area that has a permamnent + lead to it, for me to take a line off. Obviously the bodywork is - , so anything connected to this + will be running 24/7/365. Any suggestion?

    I live in Switzerland by the way, near Geneva. We were in Quebec at the end of last year, in September, and look forward to going back!


  • Robbin Davies Jan 04, 2011

    Hi Bernie,
    Once again, thanks for the response and help, although running a wire from the battery to the rear of the trunk was not really what I was hoping for! Not your fault, however. I am going to try without the relay first, i.e. wire the control box for the parking sensors directly into the negative (bodywork) and the wire for the reversing light. Im pretty certain they are right when it says that will PROBABLY (thats whats giving me hope here!) cause a false signal on the dash computer to say there is a bulb out and/or a beep from the warning alarm from the sensors every 30 seconds. However, its a quick fix. Next up, if I have to use the relay, I was thinking about just buying a second 12 volt nicad battery and keeping it in the well on one side at the back of the car (masses of room) and remembering to charge it up once in a while. Surely this little ****** can't draw much power, and its only on when the reversing light is on?
    So, you must live up by Sudbury or somewhere? Years ago I used to work in NYK, and Scotia Bank Toronto was one of my largest clients, so I was visiting TO almost once a month for 2 years ! One of my friends at the bank (my client) took me "up North" a couple of times for the weekend, and we went up to the Algonquin Provincial Park, coming back down via Sudbury. Nice part of Canada.... more to see than Medicine Hat !



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Hello robbind.
Not sure where you live in the world.
I am in Canada and your specific model is not listed in my manual.
I looked up the diagram under a CLK 350, I hope it is similar.

The system uses multiplex wiring, a signal is sent from one module to another eliminating the need for a bunch of wires to operate everything in the rear.

To find the wire color you need you may need to go directly to the bulb in the tailight assembly and find the proper wire.

On the CLK350 model the wires are Gray/Yellow to the right side and gray/blue to the left.
There is a module in the trunk that these wires lead to. It is a positive signal.

I hope this helps you with your installation. Thank you for using FixYa.


Posted on Jan 01, 2011

  • FUBAR Jan 03, 2011

    Robbin, at work right now so I will research this for you when I get home.
    Thank you for your patience.


  • FUBAR Jan 04, 2011

    Hello Robbin.
    I just went through the complete rear lighting diagram on the CLK350 and there wasn't any full time 12 volt positive source.
    All the lighting goes through the modules and they do not show internal module diagram to trace it through.
    You may end up having to run a fused wire back from the front in order to operate the device.

    I live about 80 km from the Quebec border in Ontario and 350 km north of Toronto.
    Snow on the ground and ice on the lakes. Winter has arrived.
    One of my customers moved here from Switzerland about 20 years ago. A very fine fellow, hard working and good sense of humor. Are you all like that over there? ;)




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