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There seem to be a lot of door lock posts right now. My experience is only on a 1983 300SD but here is what I have found out.
1) The only key switch ,on mine, is on the drivers door only.
2) There are 2 wires from the switch to the pump in the trunk and depending on whether
you are locking or unlocking your doors the power will go to one wire or the other.
3) The pump in the trunk will either produce a vacuum (locking the doors) or pressure
(unlocking the doors)
4) Fuse 13 feeds the door lock circuit and there is a black/red wire from the fuse to the
door switch and then a blue wire and a yellow wire going from the switch to the pump.
The pump also has a brown ground wire.
5) The hose from the pump goes to a X fitting on the right side of the trunk and from
there one line to the trunk lock, one line to the fuel door lock and the other line goes
to another X fitting that is in a channel under the floor carpet in the front passenger
side. At this X fitting one line goes back and under the front seats to the drivers
side B pillar and then to the drivers side rear door lock, one line goes back to the
passenger side B pillar and then to that rear door lock and the last line goes forward to
the kick panel on the passenger side and into that front door and then the lock.
6) There is no vac/pressure line going to the driver’s door.
7) When the drivers door is open you can not press or pull the door lock knob, it won’t
move against the pressure/ vac.
8) The wires going into any of the doors are 20+ years old and can only bend back and
forth so many times before they break. When the wire breaks it some times only
separates inside the insulation so you can’t see it but you can usually feel it or find it
with a continuity tester.
I have never had to replace any of the tube/line or any of the fittings but I have had to splice in wire sections to almost all the wires for the locks, window and seat at the drivers door hinge area.
Last weekend the pump in my car stopped pumping although the motor still runs so if anyone has a pump they want to sell let me know.
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1983 300SD
200000miles
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