Have Mercedes Questions? Ask a Mechanic for Answers ASAP
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
If you had updated the software in the SDS it is possible the software install did not complete or complete properly and caused this issue here.If this has not been checked this should be done to see if this is a software issue here.If this is or was done and found o.k. let me know so we can continue.
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The most common cause is the multi plexer assembly itself.It fails internally and causes no communication issues that you see here.The help desk will usually want you to replace it.Usually if the SDS fires up and operates but the issue is no communication with the multi plex and you have tried a different cable I suspect this is the common fault of the multi plex unit itself.
Is this the wireless multi plex unit?
O.k.,there were some issues with the wireless sds multiplex units not communicating but usually connecting the cable corrected this issue here.Since yours is wired and you have tried a new cable for it and the sds does operate this does sound like the multi plex itself is at fault internally.I have had to send for a replacement to correct this here a couple of times before.
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Unfortunately I had obtained mine through Mercedes when at a dealer working with them.I dont know if you can trust a repair unless they guarantee it or warranty the work,if they do then I would trust it.In some cases components like this off of Ebay will be o.k. and in other cases you may get something that may not work.Look to see if they are a trusted seller with good reviews as if they do then usually your o.k.