But when the the doors unlock the pump runs for a long time maybe 20 seconds.
W126 door lock problems.
Make sure the driver s side door is closed and turn the key to the lock position.
As far as the w126 cars go the only major difference besides geni and gen ii are the different engines and as far as i ve found all the body parts are the same.
The first thing is to make sure the pump is working and producing vaccum.
I am having another door lock issue.
This makes it more challenging to troubleshoot.
For starters the systems are getting old and with age comes common leaks and failed actuators.
The w126 was the first mercedes to use a separate electric pump to provide vacuum to the door lock system.
Any ideas where to start troubleshooting this problem.
W126 80 090 checking function of central locking system page 1750 jpg 65 7 kb views.
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This means there is a pressure leak in one of the actuators.
The drivers side door only locks and unlocks the driver door.
When the doors lock the pump runs for a few seconds as it should.
If your pump is running and your door locks are not working check out kent s full video manual available on w126 door lock troubleshooting and repair where.
Make note of the results.
Pull a vacuum of 10 to 15hg.
W126 vacuum door locks on the 1981 to 1991 380se 380sel 300sd 500sel 300sdl 420sel 300se 300sel 560sel 350sd and 350sdl are prone to problems.
The system also suffers from motor and pump problems due primarily to their location in the trunk.
1 273 w126 80 090 checking function of central locking system page 1751 jpg.
My new latch.
All the doors on the car should lock.