There should be a switch on the dash to turn that light on/off. The light is also activated by the rear door switches. If one of them is broken, it might be keeping the light on all of the time. The third possibility is a frayed wire that's creating an unwanted ground.

Jeremy

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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