Here's the Headlight Switch information from an Owner's Manual for a USA Version car with USA Headlights:
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Knob in Vertical Position: Off
Knob One Notch to the Right: Parking Lights, Tail Lights, Dash and License Plate Lights.
Knob Two Notches to the Right: Headlights - High or Low Beam - (Operated by Foot Dimmer Switch) and Side Marker Lamps.
Positions in Counterclockwise Direction have no function.
The Pulled-Out Position is free for an option.
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The Manual does not mention Fog Lights and shows the Pull Out as not used for USA headlights in a 280SL.
It is my understanding that only the early USA AC style headlight had Fog Lights but that they were removed in the later AN and AJ lights.
Won't help to look at the Technical Manual since I wrote the headlight article and if I'm wrong here I'm also wrong there
Richard M. NYC