my 126 keeps locking me out argh!!! - PeachParts Mercedes-Benz Forum

polarisrmk · #1 06-26-2009, 12:01 AM

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.

Oracle12345 · #2 06-26-2009, 12:04 AM

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

polarisrmk · #3 06-26-2009, 12:07 AM

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

Oracle12345 · #4 06-26-2009, 12:21 AM

Quote:

Originally Posted by polarisrmk

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

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

polarisrmk · #5 06-26-2009, 12:22 AM

Quote:

Originally Posted by Oracle12345

sounds like the lockout protection isnt working

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

Where can i obtain one of these discs?

Oracle12345 · #6 06-26-2009, 12:28 AM

Quote:

Originally Posted by polarisrmk

Where can i obtain one of these discs?

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

pawoSD · #7 06-26-2009, 12:27 AM

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.

polarisrmk · #8 06-26-2009, 12:29 AM

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

Oracle12345 · #9 06-26-2009, 12:29 AM

Quote:

Originally Posted by pawoSD

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.

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

mbenzer · #10 06-26-2009, 11:23 AM

Quote:

Originally Posted by polarisrmk

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.

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.

pawoSD · #11 06-26-2009, 07:05 PM

I will point out that on the pre-84 W126's this would be impossible, because the drivers lock is the only one that operates the locking system, and as such, it has no vacuum connection of its own. So if the pump went crazy only the other doors would lock, the drivers door would remain open. So my car is immune to this issue.

Phil · #12 06-26-2009, 07:48 PM

Quote:

Originally Posted by pawoSD

I will point out that on the pre-84 W126's this would be impossible, because the drivers lock is the only one that operates the locking system, and as such, it has no vacuum connection of its own. So if the pump went crazy only the other doors would lock, the drivers door would remain open. So my car is immune to this issue.

Your right, good point
I just went out and tested mine and it is faster than I thought, it only takes 5 sec. to lock or unlock.

whunter · #13 06-26-2009, 09:06 PM

Quote:

Originally Posted by polarisrmk

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.

Factory Alarm System Issues
http://www.peachparts.com/shopforum/showthread.php?p=1143583

Door LOCK issues, link thread.
http://www.peachparts.com/shopforum/showthread.php?p=1214456

Vacuum Diagrams W123 and W126 models
http://www.peachparts.com/shopforum/showthread.php?t=105297

Oracle12345 · #14 06-27-2009, 12:12 PM

hmm so those documents didnt pinpoint or lead you in the right direction or you didnt use the information in them the right way?

interesting

polarisrmk · #15 06-28-2009, 02:37 PM

ok so after looking at the service manual documents and checking the entire car over .... the system is completely fine! pump only runs for about 2-4 seconds tops. locks are quick and don't lag like some other mercedes i have seen. switches are functioning, there is no shorts to be found. I just hate this feature it locks by itself and i don't want it to. How do i disable this feature? Why a car would lock by itself 15 seconds after it is unlocked is beyond me but i don't like it!