My car is suffering from no dome light when the driver's door opens also, (1989 560SEL). I just dug around under the dash, and found the part number referenced above, (004 545 07 32), by MB Stars. Is it just the little guy that unplugs? About 1" x 1 1/4" x 3/4" deep, six contacts in it? Or is it the whole box behind it? I pulled mine out, opened it up, and it just appears to be 4 resistors on a small board.

Thanks for the info!
John