Door lock issue

[misor1994]

Hi guys,

2018 GTD Variant, rear driver side door (LHD) are not locking, only manually by turning the white knob at the bottom of the lock. Lights do come up, the instruments show the door as opened. Everything works fine except the locking...I have checked the wires, the fuse, I have physically removed the lock, checked and sprayed the contacts and everything seemed fine to me.
Note: the lock has SAFE feature.

Central electornics unit shows the electrical failure of that door locking mechanism. I am not quite sure what is the difference between the electrical failure and short to plus or ground. I have always thought that short to plus/ground shall mean the wiring issue. I am expecting electrical failure for the first time, so I am not sure about the reason of an error. I assume that it relates to the fault in the elctrical circuit of the lock, i. e. faulty lock, but I do not want to buy new lock and find out that the reason is somewehre else.

I am attaching an autoscan.

I would appreciate any kind of help. Thank you very much.

Address 09: Cent. Elect. (J519) Labels:. 5Q0-937-08X-V2.clb
Part No SW: 5Q0 937 086 BL HW: 5Q0 937 086 BG
Component: BCM PQ37BOSCH 034 0245
Revision: -------- Serial number: 86581912170145
Shop #: WSC 00028 028 00068
ASAM Dataset: EV_BodyContrModul1UDSBosc 018001
ROD: EV_BCMBOSCH_018.rod
VCID: 0557910925A2D8F3947-8050

Wiper motor control module:
Subsystem 1 - Part No SW: 5G1 955 119 A HW: 5G1 955 119 A
Component: WWS 171207 043 0551
Serial number: 171211123438
Coding: 0E4DFD

Rain/Light Recognition Sensor:
Subsystem 2 - Part No SW: 5Q0 955 547 B HW: 5Q0 955 547 B
Component: RLHS 047 0105
Serial number: TAY18M01D09H10M08S15
Coding: 03A8DD

Anti-theft alarm system sensor:
Subsystem 3 - Part No SW: 5Q0 951 172 HW: 5Q0 951 172
Component: Sensor, DWA 005 0316
Serial number: 000000000ZY173330R0R

Alarm horn:
Subsystem 4 - Part No SW: 5Q0 951 605 A HW: 5Q0 951 605 A
Component: Sirene, DWA 005 0314
Serial number: 00000000000000105456

Humidity sensor: interior:

3 Faults Found
197128 - Lock Module for Central Locking; Rear Left
B12DB 29 [009] - Signal Implausible
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 4
Fault Frequency: 9
Reset counter: 53
Mileage: 160928 km
Date: 2022.04.30
Time: 21:24:41

197132 - Lock Module for Central Locking; Rear Left
B12DB 01 [009] - Electrical Failure
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 4
Fault Frequency: 25
Reset counter: 53
Mileage: 160928 km
Date: 2022.04.30
Time: 21:12:54

197904 - Central Locking
B140A 4B [008] - Over Temperature
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 6
Fault Frequency: 10
Reset counter: 92
Mileage: 160928 km
Date: 2022.05.01
Time: 11:31:57

 

[misor1994]

Solved. Replaced the locking mechanism.

 

[funks]

Solved. Replaced the locking mechanism.

Can you elaborate? Did you replace the door latch actuator? or the controller? I believe the latching mechanism and the door latch actuator is one unit.

My car is at the dealership for this issue (passenger front door doesn't want to lock, car keeps trying to lock the doors when going 15 mph).
2nd time this happened, first time - they replaced the latch / actuator and the controller I believe. It basically happened again after a year and a half.

 

[misor1994]

I replaced the whole door lock, since it's made repair-proof in my opinion. I'm not very handy in disassembling such mechanisms and I bought a genuine used lock for 20 euros...it was a bargain for me rather than repairing the old one.

 

[funks]

In my case, the dealership had to replace the entire wiring door harness on the right / front side, now properly fixed.