Advice on intermittent rear door failing to unlock with VCDS confirmation

eugene89us

Veteran Member
Joined
Mar 17, 2014
Location
Southern USA
TDI
2014 Volkswagen Passat TDI SEL Premium
Hello, VW Enthusiasts.

I have run into a small problem with my 2014 Passat SEL - about a month ago, I unlocked all car door with a fob and the rear right passenger door did not unlock, requiring me to reach through front passenger door to manually pull the inside handle and unlock. This again recurred this week on two occasions - the door would unlock normally initially but after a trip would fail to unlock again. Once I pull inside handle, door opens normally with outside handle or with inside handle. I thought enough was enough and broke down on a VCDS cable. Ran the test and besides the usual Telematics (car net) and Sirius XM errors, received the following:

Address 09: Cent. Elect. (J519) Labels:. 1K0-937-08x-09.clb
Part No SW: 5K0 937 087 AE HW: 5K0 937 087 AE
Component: BCM PQ35 H+ 122 0173
Revision: BL122001
Coding: EF200E1B982B08D4098802012600854800F1A086458015B064806000BC70
Shop #: WSC 47397 001 1048576
VCID: 78A915C0A2DC91D7621-802C

1 Fault Found:
00931 - Locking Module for Central Locking; Rear Right (F223)
008 - Implausible Signal - Intermittent
Freeze Frame:
Fault Status: 00101000
Fault Priority: 4
Fault Frequency: 2
Reset counter: 155
Mileage: 105214 km
Time Indication: 0
Date: 2017.12.12
Time: 08:05:11

Freeze Frame:
Term 15 Off
Voltage: 12.70 V
OFF
ON
OFF
OFF
OFF

For the last couple of days, the door has been unlocking fine with both the FOB, unlock button on door, or with A/T level put in P after a trip. Seems like the issue is quite intermittent, but very inconvenient when it happens upon passenger pick up and their inability to open the door. How likely is this that the latch assembly/actuator is going out? Before I spend $150 on a new part, do you think this is the likely culprit or do I need to test something else? Could it be some type of upstream issue - such as bad voltage to the actuator? Electrical is my weakest point in car repair. This is the part I think I need: 5k4 839 016 s - I can get it online for around $130. Doesn't appear too difficult to get to. What other testing recommendations would you all suggest?

Any help would be greatly appreciated!
 

pedorro

Veteran Member
Joined
Apr 1, 2014
Location
Simi Valley, CA
TDI
2013 Touareg Sport
No direct experience with your problem, but have you taken things apart to check for a bad/loose connection and perhaps re-seat connectors?

Best of luck and keep us posted.
 

740GLE

Top Post Dawg
Joined
Aug 19, 2009
Location
NH
TDI
2015 Passat SEL, 2017 Alltrack SE; BB 2010 Sedan Man; 2012 Passat,
Form the MK5 Jetta days, the electro motor gets carbon built up on the contacts, you can open up the assembly and then open up the motor and clean the contacts and be good to go for the next 4 years. After it took me about 4 hours to do the first one, I lived with 2 other doors not locking. Not sure if the assembly is the same on the NMS.

Every now and then I'd grab the handle and open before unarming the alarm and crapped my pants being so startled.
 

jetlagmech

Veteran Member
Joined
Oct 1, 2009
Location
Toledo, WA
TDI
2010 jetta
from what I've read here, the '12 and newer have a plastic welded sealed door lock actuator unit. So have to replaced instead of open and clean.

The 2nd one you do is easy, The first one takes some time figuring it apart. Door actuator assy's are a problem on these cars. yours are about the same age as mine when the first one went out. I've done 2 lock actuators, driver side rear, passenger side front. Another door panel for the window pin coming out, passenger rear.
 
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