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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old February 14th, 2009, 06:15   #1
TheKid7
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Default Jetta Driver's Door Lock Problem

2003 Jetta TDI - For about the last year I have been periodically having door lock problems with the driver's door. The problem has been getting worse recently.

Problem: The Remote sometimes does not unlock/lock the driver's door. The other door locks work fine. The key always works. This problem is not related to the Remote's battery. Also, there is the same problem when using the lock/unlock switch in the car and the auto lock when the car accelerates to the preset speed. Starting a few days ago this problem is almost continuous.

What is causing this problem and how can I fix it?

Thank you.
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Old February 14th, 2009, 06:51   #2
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Does the light stay on in the dash?
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Old February 14th, 2009, 13:46   #3
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On A4s there are 2 micro switches inside the drivers door latch mechanism that wear out over time and cause the symptoms you describe.

There is a thread, either here or on VWVORTEX, were someone had taken the latch mechanism apart and replaced the switches for cheap. Otherwise, the latch mechanism is available at the dealers or from a vendor. For my 99 A4, it was about $ 185 if I remember correctly.
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Old February 17th, 2009, 20:06   #4
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V4NS-UL switch from allied electronics is supposed to be the exact replacement switch. (Got this from some other thread, possibly from VWVortex).
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Old February 19th, 2009, 13:18   #5
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yeah, had to have my mechanism replaced on my 02 so I have turned off the auto-lock with VAGCOM so it doesn't keep wearing out. If it was just my wife driving the car I probably would have kept the feature, but I figure I can lock the doors while I am driving if I need to. I also turned off that annoying audio warning when the windshield fluid runs out (true emergency). I just bent over and had the dealer fix it. Good luck.
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Old February 19th, 2009, 16:16   #6
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Um, Danny, you do realize that turning off the autolock will not resolve the microswitch problem right?

That microswitch just senses if the door is closed or not....
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Old February 22nd, 2009, 22:43   #7
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Quote:
Originally Posted by puter
Um, Danny, you do realize that turning off the autolock will not resolve the microswitch problem right?

That micro switch just senses if the door is closed or not....
Very true statement. However, if you disable auto lock, the system will lock the system a lot less causing the micro-switches to last longer...................I may go and disable the auto lock on my A5 for the same reason..............
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Old February 23rd, 2009, 05:14   #8
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Quote:
Originally Posted by Ol'Rattler
Very true statement. However, if you disable auto lock, the system will lock the system a lot less causing the micro-switches to last longer...................I may go and disable the auto lock on my A5 for the same reason..............
The switches 'wear' out from the door being open and closed. Not from the doors being locked.
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Old February 23rd, 2009, 05:46   #9
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Quote:
Originally Posted by NB_TDi
The switches 'wear' out from the door being open and closed. Not from the doors being locked.
Exactly.

I think he believes that the microswitch determines if the door is locked, but that is the job of several other microswitches within the locking mechanism itself...and those don't tend to wear out.

Danny:: take your door apart one more time and take a look, you will see that the only time that microswitch is triggered is when the door is opened or closed, locking it does not change the state of the microswitch at all. Turning off autolock is pointless if the goal is to make that switch last longer.
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Old February 23rd, 2009, 09:12   #10
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Quote:
Originally Posted by Powder Hound
V4NS-UL switch from allied electronics is supposed to be the exact replacement switch. (Got this from some other thread, possibly from VWVortex).
Do you have the link to the thread? I am having the same problem, driver door when open doesn't turn on the cabin lights or register on the dash that the door is open.
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Old February 23rd, 2009, 09:25   #11
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There is a link in my sig about that thread.

it uses a radio shack part instead, but works fine.
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Old February 23rd, 2009, 09:28   #12
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Hey john,I have a dismantled door lock assembly if you want you can have a switch from it
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Old June 25th, 2012, 06:18   #13
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Here I am at the dealership. The replacement lock assembly is over $185. With labor, the cost shoots to over $400! Reading this, it is only a switch? I will go to an independent mechanic with this information and see if the passenger rear door lock can be fixed. If it is as simple as using the key-like the old days, that will work for me until I can get the door secured. Thanks for the posts!
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