OK, there's something called N7, the "exterior lamp failure monitoring unit." In the schematic, it's just a "black box" with a transistor symbol on it (and, no doubt, a label saying "no user-serviceable parts inside"). It lives in F1, the Fuse/Relay Box, in "position K," at the rear of the fuse box. That's on the left (driver's) side, next to the firewall.

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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