[Kennyk82]

There are four switch buttons on the dash in a row above the climate control.... one controls the antenna up and down, but what are the other three? I can’t seem to find any diagrams showing them? They are so worn I can’t make out the symbols, one looks like a vertical coil but not sure....

 

[Alec300SD]

https://handbook.w116.org/OM/OM-8.pdf

Check out W116.org, many knowlegable folks there, as well as the W116 FSM.

 

[Dikdaan]

Sunroof, rear courtesy light and rear window demister. But yes go check out www.w116.org that's where all the 116 heads hang out.