Hello, I have a problem for some time, I own a SL600 r129 m120, and I have a problem with it in the engine control unit. the two ECUs do not communicate with each other. if I want to exchange one with the other, it's the same problem. the problem is not the ecu, I think it's a socket where it attaches. can you help me somehow please I'm looking for a wiring diagram. Thank you

 

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THANKS, i find the site, but they have only DWF format on the docs and i can’t open the wiring diagrams. Can u please tell me about other sites or a program that i can open the document