Alba108

Hi all,
So I've owned my 1971 W108 for about 8 years and have been slowly addressing issues since I got it. I'm now trying to tackle what I can only describe as a mystery.

In the center panel where the electric window switches are, there is a 5th switch in the center. Its presently not doing anything but has the same design and action as a window switch. I assume its original/factory or dealer since its a stock design part. The car does not have a sunroof. Everything else electrical works.

In researching I can't find any clues. Most photos I find online of other 280SE sedans don't have the switch.

Anyone out there with the same switch? Any clues as to its purpose?

Thanks in advance,

Alba108

So I've found 2 other photos that show a switch in the same place. One is a 1971 300 SEL 6.3 and the other is 1969 300 SEL 6.3.

chassis

Exactly which model do you have? What is your VIN/chassis number? This can help identify the function, based on the option content of your vehicle.

The three photos you posted: your vehicle, the 1971 6.3 and the 69 6.3 each have a different transmission shifter arrangement. Does this provide any clues?

Alba108

thanks Chassis.

It’s a 280SE sedan, M130 engine.

vin: 108.018-12-083992

I’d considered options...maybe central locking?

Re the shifter, I have the steering column shifter but I could think how that related.

Alba108

I should have added I do have the original spec and pricing data as follows:

chassis

Just guessing:

- rear window heat
- rear window sun shade (probably not this)
- central locking
- window lift lock

Do you have the owner's manual?

rustybear3

Ejection seat.

ygmn

sunroof?

Alba108

The car does not have a sunroof.

Alba108

I wish! I can think of a few folks to put in one of them

Alba108

Thanks Chassis.

Good suggestions

- Rear window heat is part of the specification however the switch is a pull switch on the dashboard just below the clock cluster.
- Rear window shade isn't specified. I don't think this came until later model years.
- This is still a possibility. I haven't had a chance to investigate. I'm going to verify whether there are actuators behind the door panels or lines in the door connector hoses, Or any sign of pneumatic pump/valve in the engine bay.
- Not sure what you mean by this? If you mean stopping windows from being operated that is the small black square switch on the left between front and rear buttons.

Afraid I don't have an owners manual for this one.

chassis

You need more information:

- parts catalogue
- service manual
- owner’s manual
- electrical diagram
- vacuum diagram

Remove the switch from the console. What comes out with it? Wires? What colors are they? Vacuum tubing?

You need to to keep digging.