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Old 11-01-2001, 03:53 PM
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Join Date: May 2001
Location: Florida
Posts: 1,105
How DOES this actuator work(central locking system w126)

I have an 83 300SD, and the locking system stopped working very suddenly. I checked the pump with an external 12v battery and it was working, so i then plugged it back in. When i plugged the pump back in it proceeded to run by itself for a couple minutes. I then took the actuator out of the drivers door and disconnected it. next i locked all doors except drivers and put the yellow and red wires together, all the doors opened. I then locked all the doors againa and put blue and red together, again, they all opened! what am i missing here? is there a special switch INSIDE the actuator or is there another valve somewhere? this is puzzling me, i appreciate your help
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Old 11-01-2001, 06:47 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
The pump has a processor inside that sees the signals. Ground and power alternate to show lock and unlock. If one pod is leaking, none will work properly because the pump will run-on and time out.
Donnie Drummonds
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Old 11-01-2001, 07:30 PM
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Join Date: May 2001
Location: Florida
Posts: 1,105
so you think my pump is fubar? any chance of me fixing it myself? thanks
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Old 11-02-2001, 01:21 AM
MikeTangas's Avatar
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Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Sounds like the pump is working as it should, and one of the door actuators has a leak. The pump keeps running, the leak won't seal and the pump times out and shuts down. You need to check the condition of the door actuators and all the vacuum line connectors.
Mike Tangas
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Old 11-02-2001, 01:37 AM
David C Klasse's Avatar
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If you listen very closely inside the car after locking (and/or unlocking) the doors, you might hear which door the leak is coming from. This might save the time of taking off each door panel and inspecting each individual actuator.
Good luck.
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