Please keep us updated. I had the same exact problem to my 95 E320. The buzzing is from the turn signal relay box (i had it replaced at the tune of $140. All my fuses looked good, i messed around with the relays and what do you know, the car worked!! For a little while, then it went out again.

I have a young friend who works for a Mercedes dealership. He thought it was the ignition switch. It wasn't. The park neutral switch. It wasn't.

He finally found a wire in the dash that was broken. He is going to fix just that wire and see how it works.

Hope yours is fixed for good with the fuse. Let us know.

Jimmy

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1995 E 320 119,000
1983 300 TD 285,000 (sold)
1973 220D (sold)