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Hi, the part is available but you probably only need to replace the fuse in the top of the relay. The relay is called the overvoltage protection relay and is located on the relay panel above the fuse box. It is not behind the glove box. You will need to remove the covering under the passenger side dash to access the relay. The part number for the relay is 201 540 08 45. Click here for a source for the relay. There is a fuse in the top of the relay under the plastic cover. Check and replace that fuse if it is bad and you should be fine.
Let me know if it works.
Hi, I'm just following up with you on the Mercedes. Whatever happened with this? Did you ever get it squared away?