Where does the door contact switch go on a 2000 Mercedes Benz E320 Wagon?

peter c

Rookie
I was told that i needed a contact switch to have everything operate normally again (interior lights, and lights blinking when locked with keyfob). I was told that this switch is the reason why the car thinks that the drivers side door is open. I bought a replacement switch, but where in the door does it go?
 
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