my 126 keeps locking me out argh!!! - Page 2 - PeachParts Mercedes-Benz Forum

pawoSD · #16 06-26-2009, 04:22 PM

Quote:

Originally Posted by Phil

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

I doubt the pump runs for 15 seconds, thats waaay too long. Its easy to hear if you listen by the trunk. The pump on my car runs maybe 4 seconds to unlock, and about 3-4 to lock. Any longer and there's a significant leak somewhere and you're just wearing out the pump.

On my W124 it only runs about 1-2 seconds.....its a much quicker system as each lock has a dedicated line to a port on the pump instead of being a shared system like the older ones. They probably did this to compete with newer cars using electric actuators which are nearly instant.

Phil · #17 06-26-2009, 05:07 PM

Quote:

Originally Posted by pawoSD

I doubt the pump runs for 15 seconds, thats waaay too long. Its easy to hear if you listen by the trunk. The pump on my car runs maybe 4 seconds to unlock, and about 3-4 to lock. Any longer and there's a significant leak somewhere and you're just wearing out the pump.

On my W124 it only runs about 1-2 seconds.....its a much quicker system as each lock has a dedicated line to a port on the pump instead of being a shared system like the older ones. They probably did this to compete with newer cars using electric actuators which are nearly instant.

I have seen them run for way more than 3 or 4 seconds although you are probably right in thinking that would mean a leak. On mine I have gone through all parts to correct all leaks and it still takes more than 4 seconds. I'll time it tonight.

Are you saying the W124 has a pump with 4 or 5 ports on it? That would be interesting. I wonder if one could be adapted to a 126?

pawoSD · #18 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.

pawoSD · #19 06-26-2009, 07:07 PM

Quote:

Originally Posted by Phil

I have seen them run for way more than 3 or 4 seconds although you are probably right in thinking that would mean a leak. On mine I have gone through all parts to correct all leaks and it still takes more than 4 seconds. I'll time it tonight.

Are you saying the W124 has a pump with 4 or 5 ports on it? That would be interesting. I wonder if one could be adapted to a 126?

I suppose it might take longer if the pump itself is just slower or worn etc...

Yep, the W124 pump has 4-5 ports (not sure if its 4 or 5)....one for each actuator (though I think the trunk/fuel door one are shared) It works extremely quickly compared to the W126 setup. It is probably a more advanced pump, it sounds like it runs faster when it operates too.

Phil · #20 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 · #21 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 · #22 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 · #23 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!

Oracle12345 · #24 07-01-2009, 02:01 PM

my sdl doesnt lock me out and its a 86. i highly doubt they changed the locking system that much so something is wrong.

Phil · #25 07-01-2009, 02:27 PM

I'm wondering if some one put in a keyless entry system that is malfunctioning and pulling down the lock button on the drivers door which would cause all the others to lock. Sounds like a stretch but nothing else comes to mind.

Oracle12345 · #26 07-01-2009, 02:32 PM

Quote:

Originally Posted by Phil

I'm wondering if some one put in a keyless entry system that is malfunctioning and pulling down the lock button on the drivers door which would cause all the others to lock. Sounds like a stretch but nothing else comes to mind.

a good idea. most places that put in that sort of thing dont know what their doing and screw something up on a car

polarisrmk · #27 07-01-2009, 03:46 PM

The automatic locking is consistent down to the second i would think a malfunctioning part or short would not be consistent. I have had the entire interior out of this car there are no after market parts also had door panels off. strange thing is when you shut the car off and get out the doors unlock and it does the same thing within 15 seconds the doors/trunk lock automatically except the drivers door! I just want to beable to lock them when i want to. i want no auto locking feature ! my 86 bmw does not lock unless its told to and doesn't used vacuum either course its only a 3 series

Anyone have an 85' SD??????

polarisrmk · #28 07-07-2009, 04:49 PM

Well she locked my out again!!!!! this time not my fault but the detail shop and now i can't get into the damn thing! Help!!!!!!!!!!!!!!!!!!

buffa98 · #29 07-07-2009, 05:20 PM

disconnect the vacum pump in the trunk. once you get it open. Pull the spare, on the passenger side there is a foam cover that covers your pump. I had to unplug mine for differnet reasons. The only thing is NONE of the auto locks will work. You will have to manually lock and unlock all door etc

Phil · #30 07-07-2009, 05:32 PM

Im not sure of the year of your car but the only way the drivers door could lock like that is if there is something attached to the key lock inside the door that is pulling the lock knob down. There is no pneumatic connection to the lock unit unless some one added something. I even tried adding a vac/pressure line to the drivers door lock on my car and then it would work if I activated the pump in the trunk (I did this as a test for a remote door lock but it turned out to be easier to add a solenoid control to the lock knob in the drivers door).
I would take the door panel off and look up at the shaft going from the knob to the key lock to see if anything was added. Even if the pump ran from a short it wouldn't lock the drivers door.