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  #1  
Old 08-10-2010, 10:57 AM
psaboic's Avatar
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Location: SW Washington Coast
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Door lock troubleshooting (again)

Ok, I have a couple of days off starting on Thursday so I want to fix an issue with the 83 300D. The locks! Everything else vacuum operated works ok (Engine Shutoff, brakes, transmission ) So, where would be a good place to start and a logical progression?

I have read most of the troubleshooting posts and I have the vacuum diagrams and a decent hand held vacuum pump, I just need some input on where to start eliminating stuff.

Thanks.

Glenn
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2017 Santa Fe 13K (hers)
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1998 Volvo S70 T5 Turbo 115K (kids)
1992 Ford F150 4WD 257K (wood getter)
1983 Mercedes 300D 315K (diesel commuter)
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  #2  
Old 08-10-2010, 11:46 AM
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http://www.youtube.com/watch?v=HoVVUMvEPx8&feature=player_embedded
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  #3  
Old 08-10-2010, 11:46 AM
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Location: Albany, OR
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I would pull the carpets and then look under the plastic cover running down the outside of the footwell. All the vac lines for the door locks are there. Thats usually where I start troubleshooting the door lock vac. You'll find two 3 way connectors, one unlock(yellow/green) and one lock(yellow/red). Here is where each line goes for both sets of lines.
1. Master door lock switch in the drivers door
2. Driver's rear actuator.
3. Passenger side and trunk.

On the passenger's side under the same plastic cover you'll find two 4 way connectors. Here is where the lines goes.
1. Vac coming from the driver's side
2. Passenger front door.
3. Passenger rear door.
4. Trunk and fuel door lock.

Here are a couple pics of the lines in the footwells.
1. Driver's side.
2. Passenger side.

Test each line by pulling vac on it, and work your way through the system This will tell you which actuators are leaking. Test both the lock and unlock systems. As one side can leak and the other won't.
Attached Thumbnails
Door lock troubleshooting (again)-drivers_lines01.jpg   Door lock troubleshooting (again)-pass_lines01.jpg  
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  #4  
Old 08-10-2010, 01:28 PM
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Location: Mount Holly, NC
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hand pumps suck! get a motorized one!
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  #5  
Old 08-10-2010, 03:54 PM
Biodiesel300TD's Avatar
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Location: Albany, OR
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Quote:
Originally Posted by vstech View Post
hand pumps suck! get a motorized one!
Mr. Lazy I see

I've been using my hand pump mity vac for years. The only time it's a bear is when I've used it to test the vac reservoir. Other wise a few pumps tells me what I need to know.
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'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
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  #6  
Old 08-11-2010, 06:17 PM
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MityVac's can be cheeeep ... if your patient .. on ebay

I was patient.
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