What year is your 210? That might make a difference. There's a fuse panel just to the left of the headlight switch, at the end of the dash. You have to open the driver's door to see it and pry off a cover panel. I believe the fuse panel thus revealed is part of the headlight switch, at least it is in my '96 E300D.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970