Quick question I couldn't find an answer to - why are there two switches on the driver door ? One is interior light and the other ?
Thanks
the other sw allows you to operate the electric window lifter while the door is open even if ignition is at 0 position
i always wondered why i could close the window with the engine off and door open
everyday is a school day
I have both switches on my 6.9 but that function does not work. Is it a Euro thing?
There are two switches on the drivers door?
Yes 2 separate ones vertically arranged. Seems like the bottom one controls the light. Top one supposedly enables the driver window to be operated. I think the way it should work is the window rolls up by itself if you leave the car and forget to roll up the window. Mine does not work. Switch tested good. Maybe a relay out of commission?
Hi Dan,
No, the purpose of the sw is not that. Window won't roll up automatically; too dangerous! The modern safety features to avoid somebody accidentally pinching his/her fingers, hand, head did not exist back then as in cars of today. Well some already exists (eg torque or temp limiters to reverse motor actuation) but not used yet in this application.
As stated in my previous message:
Quote from: revilla on 10 May 2016, 11:04 AM
the other sw allows you to operate the electric window lifter while the door is open even if ignition is at 0 position
Thus, no automation implied. so you still have to operate the window lifter sw, but conveniently you don't have to put back and turn the ignition key. Clever MB engineering thinking in fact (practical, very low cost and sophisticated without complexity).
Hope it's clearer.
Thanks yes great explanation!
Still not sure why mine won't work though.
I've read elsewhere that the second switch triggers the alarm to let you know keys have been left in the ignition?
Maybe certain countries got different features for the "2nd switch"?
These switches must not of been offered on the SD. My doors are totally free of any switches.
The switches are on the A - Pillar on the inside, where the door closes. I am sure you must have at least one to trigger the interior light?
Quote from: daantjie on 15 May 2016, 11:40 AM
The switches are on the A - Pillar on the inside, where the door closes. I am sure you must have at least one to trigger the interior light?
Only thing inside the A pillar is a push button. It controls the door buzzer and the light. There is a covering beside it. Probably to fill the blank.
That is how mine is too - only one pin switch, the location below is capped off with a square cover, but would fit another pin switch just like the one for the interior light.
Ok at least for my setup the mystery is solved. Top switch only triggers the buzzer for key left in ignition. Window does not work with ignition off.
Bottom one controls dome light with delay off function.
I know there were many evolutions of the seat belt warning system. Perhaps the variation in this function is related to that?
Daniel did you try it with the door open? it only works when open on mine anyway.
i don't have the warning buzzer for the lights left on, was that standard? and i am just missing the relay i don't have one behind the cluster.
john
Yup no dice with door open. I have to have key in "ON" position for switch to operate the window, door open or not. Warning buzzer is not for lights left on but rather for key left in the ignition when you leave the vehicle and car off.
Quote from: Zaxxon on 15 May 2016, 03:10 PM
That is how mine is too - only one pin switch, the location below is capped off with a square cover, but would fit another pin switch just like the one for the interior light.
My guess is because of how the diesel utilizes the vacuum pump from the motor.
so we know of 3 variations now:
2 switches: 1 for dome light + 1 for window lifting with ignition at 0 position (John and I identical setup). No buzzer of any kind
2 switches: 1 for dome light + 1 for buzzer indicating key left in ignition, car off, door open
1 switch: 1 for dome light. 2nd sw slot covered
seat belt buzzer anybody?
I have the driver seat occupied sensor which buzzes for a few seconds until you click the seat belt in. The warning light also comes on on the dash but goes off if you click it or after a few seconds even if you don't. I think its the 5th gen of this system. Will have to check the service manual.
Mine has one switch, seat belt light in the dash, seat belt buzzer as well as headlight on buzzer and interior light with a delay shut-off.
I don't know about the buzzer-thing, but there would be little need to have a second switch for a buzzer. Logically, both functions could be triggered by 1 switch only.
The second hole is present and capped for the car-alarm option.
What I found out is that those alarms were always dealer-installed, not factory, even though officially MB.
Other holes for switches would be drilled where/when needed, in gasoline flap, trunk, bonnet and glove compartment, each triggering the alarm when opened while the alarm is active.
To activate/de-activate the alarm one would need special door locks for the front doors, especially supplied for those with factory alarms.
I bought them, that's how I know.
Quote from: floyd111 on 01 June 2016, 06:25 PM
...The second hole is present and capped for the car-alarm option.
Not the case. As stated by others earlier in the thread, the 2nd SW let you roll the electric window up/down even if key is out of ignition, or buzzer to indicate key left in ignition. Why 2nd hole ONLY in driver's door? I doubt a MB engineer would have added the provisions for alarm 2nd SW ONLY to the driver's door and not on the other 5 locations. It just doesn't make sense. The 2nd SW in driver's door had other purposes.
Quote from: floyd111 on 01 June 2016, 06:25 PM
Other holes for switches would be drilled where/when needed, in gasoline flap, trunk, bonnet and glove compartment, each triggering the alarm when opened while the alarm is active.
??? Why to cannibalize a car like that? Technically, an alarm of those days could have been hooked to factory harness with no drilling which welcomes corrosion (e.g. front/rear dome lights come ON using existing SW's in all 4 doors, trunk and bonnet). Alarm would go off if any of these 6 existing SW's close the circuit. A much less invasive procedure and especially no need for drilling.
The mystery that still remains is why/when and in what versions the 2nd SW started to be used for either of the 2 functions described above.
My '77 California 280SE has the double switch on the driver's door, one for the front interior light and one for the key-in-ignition buzzer; each rear door has a switch that controls the rear interior light. My seat belt warning light appears to be controlled by a switch in the driver's side receptacle as there is a wire coming down out of that which fastens to a connector under the seat - there is no buzzer for this. I think this switch must be buggered as the seat belt light won't go out and is blanked out with a piece of black tape from the previous owner - he told me that he had asked his mechanic about fixing it and the guy said it'd be more bother than it was worth...imagine you'd have to take the seat out at least to get at the receptacle and I don't know if that piece comes apart or not - any ideas or suggestions?
That is how mine works too. Many folks unplug the connector as that buzzer is also known as the most annoying sound in the world ;D
Raise up the seat by the side leaver and shine a flashlight in there. The connector coming from the receptacle is most probably just unplugged.
That all sounds nice and well, but what remains is that this car alarm system was definitely an MB option, and was most definitely installed by installing a trigger switch in that second hole in the door.
I can't vouch -as of yet- that the rear doors were connected to that system, but the rear doors did not have key-locks.
The front doors HAD special locking mechanisms as part of this car alarm.
Part number 1167600959, Tur, Griff, Sonderschliessung EDW
Car alarms, back in the day, were not as sophisticated as they are today, but the W116 was well advanced sporting an optional system that would be triggered, even by opening the glove compartment or the tank flap.
I could imagine that the rear doors, having no keyholes, would not be equipped with triggers.
On a side note.. did ALL Euro/USA W116's have this annoying buzzer originally, or was this one of the many way Detroit managed to make people hate MB's?
BTW in my car a 1974 the second switch is for the windows - as to the seatbelt there was a wire - which was not for the buzzer - but would actually be an electrical switch which would not allow the car to crank unless the seatbelt was buckled - quite annoying actually