I have a 1991 300CE and I am wondering what the purpose of the 3"x 2" perspex panel in the door pocket is. It is only on the passenger side, not the drivers. it is not covered in the hand book or any other publicatiob I have.
I first of all thought it was an entrance light and took of the door panel to change the bulb but there wasn't one. The only wiring went to the kerb light in the bottom of the door. It seems to serve no useful purpose but its obviously there for a reason. Any ideas anyone ?

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Larry