So i have now been locked out of my car 3 times because i leave the keys in the ignition when i am working on it and the doors lock by themselves! This is the only car i have ever owned that does this with the keys in the ignition! This is getting really old. I have been leaving the window down when i have been working on it lately. Is there any way to make the car not do this? Also annoying when you get out of the car and go to get something out of the back seat but the car has already locked the doors!!! It is really annoying! I will decided when and if i want the doors locked.

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1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it

sounds like a vacuum line is hooked up wrong. i had the same happen to me but my front windshield on the 77 is out so I wasnt locked out. Check the vacuum line config at the mast vacuum switch in the drivers side door

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

well the locks function just fine.... its just that after unlocking the door if you wait ten seconds they lock by themselves . you can hear the the pump or whatever in the truck turn on when this happens.... its like its programmed with a timer or something

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1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it

sounds like the lockout protection isnt working

the procedure for checking central locking is on the w126 service disc

could be one of the actuators in the doors

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

Where can i obtain one of these discs?

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1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it

W126's do not use vacuum from the engine like the W123's.....they have a separate pump.

Sounds like the switch in the door or something is triggering the pump when its not supposed to.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

i will have to email them to you or you can buy a disc locally at your closet dealer, ebay too

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

i will check that....but somehow i think that its supposed to do this i just want to make it not do this unless i tell it to

__________________
1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it

yeah been working w123's lately so my mind set wasnt in w126 at first.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

that would be great !!!

__________________
1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it

It sounds like you have a short in the wires from the door switch, probably in the hinge area.

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1983 300SD
200000miles

Ditto.

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Sam

84 300SD 350K+ miles ( Blue Belle )

I had a similar problem with my '91 350SDL if I opened the trunk with the doors closed and the keys in the ignition. It was an electrical short but I'm sorry I can't tell you how it was fixed.

if this was the case why would there be a delay in the locking..... it locks approximately 15 seconds after the door is unlocked regardless of the doors or trunk being open or closed

__________________
1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it

On a SD the pump in the trunk runs to produce pressure or vacuum depending on what is asked for and it keeps running for a little bit until it reaches its max limit then shuts off so if you unlock it it probably runs for 15 seconds until it reaches its limit then shuts down and restarts in the other mode due to a short.
Look at this thread and read post #13. Disreguard post #9 because I left some stuff out in it
http://www.peachparts.com/shopforum/showthread.php?t=150356

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1983 300SD
200000miles