Did you check the fuses?

You might try twisting the fuses in the sockets, or just replace them. They aren't cheap, and they frequently look good, even when they are bad.

Also, I've never heard of a 300E sedan with self leveling rear suspension. Are you sure it has this?

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".