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Well hey! I have a 1980 300D, and it has 4 buttons on one section of the center console. One is for the antenna, another is for the sunroof, and the next is for the rear cabin light. I don't know what the 4th button is supposed to do. It looks like a spring, somewhat similar to the glow plug indicator light on the dash. When I push it it lights up, but I don't<br> notice anything happening. I thought it might be the rear defroster, but as far as I can tell, there are no vents back by the rear windshield. Anybody?<br>