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Discussion Starter · #1 · (Edited)
Diagnosing your Alarm issue... A possible door latch issue 3B1837015AT, 3B1837016CG, 3B4839015AP, 3B4839016AP

Very often MK5 Jetta, Jetta Sportwagen(JSW), Golfs, GTIs and Beetles will have intermittent alarm issues. Usually they will go something like this. Your vehicle is parked with the alarm armed and all of a sudden the alarm starts going off by itself.

The reason this happens is because the micro switch inside the door latch assembly is not reading properly. When the microswitch on your VW goes bad it will tell the vehicle every once in a while that the door has been opened even though it has not been touched.

It is very common for people to believe that their alarm going off by itself has something to do with their keys and or the alarm system on their Volkswagen. This is not generally the case.

There are a few pretty simple ways to tell if the door latch on your VW is causing your issues.

Ways to check to see if your latch is the problem

• Sit inside your drivers seat and Shut the Drivers Door

• Arm the alarm. You should hear a beep to confirm it is armed (If not there is a red light on the drivers door panel that blinks one the alarm is armed)

• Once you have confirmed the alarm is armed. Open the drivers side door (DO NOT disarm the alarm before opening the door)

If the alarm does not go off you have confirmed that the drivers side front door latch is a problem. The reason this worked is because when you open the drivers door with the alarm armed, the micro switch inside the drivers side door latch should tell the alarm to activate as someone is breaking in to the vehicle.

If you find this is not your issue you should repeat this procedure on each door to confirm that when you open doors on the vehicle while the alarm is armed that the microswitch inside the door latch assembly does its job and tells the alarm to activate.

This is the drivers front latch for the models listed below. This is the most common latch is 3B1-837-015-AT/ 3B1837015AT



Drivers Side Front Door Latch Assembly 3B1-837-015-AT

Passenger Side Front Door Latch Assembly 3B1-837-016-CG

Drivers Side Rear Door Latch Assembly 3B4-839-015-AP

Passenger Side Rear Door Latch Assembly 3B4-839-016-AP






VW Beetle Conv 2003-2004-2005

VW Beetle Convertible 2006-2007-2008-2009-2010

VW GTI MK5 2006-2007-2008-2009

VW Jetta MK5 2005.5-2006-2007-2008-2009-2010

VW R32 2008

Vw Rabbit 2006-2007-2008-2009 MK5

Vw Sportwagen 2009

Vw Sportwagen - 2010-2011-2012-2013
 

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Got my latch, best price on the internet. Thanks!
 

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Discussion Starter · #5 ·
what if you open the car driver side door and the alarm does go off with the flashing lights but no siren

even tho when you arm the car it chirps and the lights all flash???
That sounds like this could be an issues with the alarm horn, but it will require further diagnosis to verify
 

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so this has got me thinking and wondering now. Opened my door today and no fuel pump, no lights, no mfd showing door open ECT..... was like no way the bat is dead. Put key in and turned key to on everything lit, prime pump ran, turned to start and car fired right up.

So now I'm wondering.... switch.... or door wiring problem? Guess I should open my door and check the harness
 

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Discussion Starter · #7 ·
so this has got me thinking and wondering now. Opened my door today and no fuel pump, no lights, no mfd showing door open ECT..... was like no way the bat is dead. Put key in and turned key to on everything lit, prime pump ran, turned to start and car fired right up.

So now I'm wondering.... switch.... or door wiring problem? Guess I should open my door and check the harness
Most likely it is the drivers front door latch actuator, but checking the door harness at the hinge is not a bad idea either.

We have more info about the door harness here
http://www.deutscheautoparts.com/newsarticle.aspx?NID=15
 

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so this has got me thinking and wondering now. Opened my door today and no fuel pump, no lights, no mfd showing door open ECT..... was like no way the bat is dead. Put key in and turned key to on everything lit, prime pump ran, turned to start and car fired right up.

So now I'm wondering.... switch.... or door wiring problem? Guess I should open my door and check the harness

Same symptoms, replaced my door lock actuator and the issue was resolved. I had a intermittent implausible signal error in Vag-Com as well.
 

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Same symptoms, replaced my door lock actuator and the issue was resolved. I had a intermittent implausible signal error in Vag-Com as well.
Yep just pulled one of those. :( well atleast I know what it is.

This kind of freaks me out as I have been eyeing the fact that there is no manual lock / unlock latch inside my car. Only the buttons on the doors. There is also only the one key hole in the drivers door. So if the driver door is messed up and you have no power you would be locked out of the car. What a horid design to not have a manual backup.
 

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Discussion Starter · #10 ·
Yep just pulled one of those. :( well atleast I know what it is.

This kind of freaks me out as I have been eyeing the fact that there is no manual lock / unlock latch inside my car. Only the buttons on the doors. There is also only the one key hole in the drivers door. So if the driver door is messed up and you have no power you would be locked out of the car. What a horid design to not have a manual backup.
There is a lock cylinder behind the cover next to the drivers front door handle. If the battery dies you can get in manually through there.
 

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Diagnosing your Alarm issue... A possible door latch issue 3B1837015AS, 3B183...

What?? I might be late to the party but if you have a locking mech issue the lights will blink with no honk, at no tine did my alarm go off by its self, if you have a lock mech issue at no time should your car honk!!!


Edit - from the key fob - no one uses anything but the key fob
 

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Discussion Starter · #12 ·
What?? I might be late to the party but if you have a locking mech issue the lights will blink with no honk, at no tine did my alarm go off by its self, if you have a lock mech issue at no time should your car honk!!!


Edit - from the key fob - no one uses anything but the key fob
What you are describing is one possible symptom. Since these door locks dont fail the same every time they will not always have the same symptoms
 

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@Paul

What kind of error you get in the vag-com with this issue ?

Currently I have this:

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver Labels: 1K0-959-701-MIN3.lbl
Part No SW: 1K0 959 701 M HW: 1K0 959 701 M
Component: Tuer-SG 005 0983
Coding: 0001077
Shop #: WSC 01279 785 00200
VCID: 387B2CD332C3

1 Fault Found:
00928 - Locking Module for Central Locking; Front Driver Side (F220)
008 - Implausible Signal

-------------------------------------------------------------------------------


Can it be corrected replacing the latch ? GTI- 2007
 

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Discussion Starter · #16 ·
@Paul

What kind of error you get in the vag-com with this issue ?

Currently I have this:

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver Labels: 1K0-959-701-MIN3.lbl
Part No SW: 1K0 959 701 M HW: 1K0 959 701 M
Component: Tuer-SG 005 0983
Coding: 0001077
Shop #: WSC 01279 785 00200
VCID: 387B2CD332C3

1 Fault Found:
00928 - Locking Module for Central Locking; Front Driver Side (F220)
008 - Implausible Signal

-------------------------------------------------------------------------------


Can it be corrected replacing the latch ? GTI- 2007

Yes replacing your drivers front door latch would very likely solve your problem

http://www.deutscheautoparts.com/View/3B1-837-015-AT/3B1-837-015-P/0/61082
 

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This may be slightly different, but I have recently had an issue where I will arrive at my destination, pull the keys from the ignition, and upon opening the drivers door the alarm will go off. Can a faulty door latch mechanism/assembly engage the alarm by itself?
 

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Discussion Starter · #18 ·
This may be slightly different, but I have recently had an issue where I will arrive at my destination, pull the keys from the ignition, and upon opening the drivers door the alarm will go off. Can a faulty door latch mechanism/assembly engage the alarm by itself?
You might have more than one issue. It sounds like either the alarm never actually disarms or you have more issues at work here.

Sorry we dont have a better answer
 

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Sometimes I will unlock my car, get in, close my door, and then very shortly after closing my door the car will lock itself. Sometimes the fuel pump kicks on when I open the door and sometimes it doesn't. When I first got the car I thought I remembered it always turning on when I unlocked and opened my car door. Could the door latch be the issue?
 

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Discussion Starter · #20 ·
Sometimes I will unlock my car, get in, close my door, and then very shortly after closing my door the car will lock itself. Sometimes the fuel pump kicks on when I open the door and sometimes it doesn't. When I first got the car I thought I remembered it always turning on when I unlocked and opened my car door. Could the door latch be the issue?
Yes this is almost certainly an issue related to the drivers door latch. Vw alarm systems are set to relock if the door is not opened after the alarm is unarmed. When you are having an issue with the door latch it doesn't recognize when the door is open, which is why it relocks on you.

Hope this helps.
 
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