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  #1  
Old 05-11-2007, 03:02 PM
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Vacuum switch central locking

How do you troubleshoot the vacuum switch in the drivers door? I took out the switch and applied vacuum to the middle tee. I didnt get any vacuum. Do I need to get a new switch?
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  #2  
Old 05-11-2007, 03:18 PM
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I do not know how to test it. All it does is direct vacuum to the locking or unlocking segments based on it's position.
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  #3  
Old 05-11-2007, 03:23 PM
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I bet it leaks, most original ones do.
www.dieselgiant.com has a nice pictorial on how to replace them. I think he shows how to test it too.
John
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  #4  
Old 05-11-2007, 04:19 PM
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There was no test procedure on DGs site. The lock and unlock lines both hold vacuum. So Im guessing that if I pull vacuum on the middle tee and switch between lock and unlock...
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  #5  
Old 05-11-2007, 08:47 PM
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Here's a DIY Vacuum Troubleshooting Guide I wrote up on another forum. The door lock section starts on Post #5.
http://www.schumanautomotive.com/forums/showthread.php?t=2755
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  #6  
Old 05-12-2007, 12:19 PM
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The driver's door has an electric switch no vaccum line to it. Biodiesel has a good write up there that will help you out.
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  #7  
Old 05-12-2007, 02:08 PM
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No electrics in my door system. Just checked the vacuum switch in the drivers door. It held vacuum in both lock and unlock position. Applied vacuum on the middle T and in the firewall(solid yellow line), it held vacuum as well. It lost vacuum while switching from lock to unlock and vise versa but thats normal right?
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  #8  
Old 05-12-2007, 02:16 PM
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Quote:
Originally Posted by my123ca View Post
No electrics in my door system. Just checked the vacuum switch in the drivers door. It held vacuum in both lock and unlock position. Applied vacuum on the middle T and in the firewall(solid yellow line), it held vacuum as well. It lost vacuum while switching from lock to unlock and vise versa but thats normal right?
That sounds correct, when it's in the lock position the unlock circuit is vented through the 3-way valve in the divers door (and visa-versa).
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  #9  
Old 05-12-2007, 03:12 PM
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w123...not electric

w126.....electric
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Old 09-10-2012, 01:11 AM
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Looking for a Troubleshooting guide on the W126...mine works sometimes, and sometimes it wont...I'm not sure where to look
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