Mercedes Interior Light Door Switch This listing is for a Mercedes Door switch. This is for use in various Mercedes cars to activate the interior light by opening the door. As far as i know this should work with w126, w123, and w124 chassis cars, but I'm pretty sure it fits many others as well, if your door switch fits in a rectangular hole, and has two wires connected to it, chances are this one will work. Part number is 001 545 87 14 (0015458714) The switch is in good working condition. Thanks for looking!