CODING WESTFALIER TOWBAR AND OTHER MODULES A6 C7 2014

tetley · Sep 30, 2017

I have fitted a Westfalier towbar and dedicated electric kit to my A6 C7 Avant, and need to code everything up. The Westfalier instructions for coding are for VAS 5051, so no use for VCDS.

It would be great if someone could walk me through what's needed.

Code:

Chassis Type: 4G-AU57 (4G0)
Scan: 01 02 03 05 08 09 10 15 16 17 19 3B 42 44 46 52 53 55 56 5F
          62 69 6D 72

VIN: WAUZZZ4G3EN090454   Mileage: 52166km-32414miles

01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: Malfunction 0010
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
10-Park/Steer Assist -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: Malfunction 0010
3B-Sensor Elect. -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: OK 0000
5F-Information Electr. -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
69-Trailer -- Status: Not registered 0011
6D-Trunk Elect. -- Status: Malfunction 0010
72-Door, Rear Right -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (J623-CDUD)       Labels:. 059-907-401-V2.clb
   Part No SW: 4G0 907 401 Q    HW: 4G0 907 401 
   Component: 3.0TDI EDC17  H41 0002  
   Revision: 53H41---    
   Coding: 12254012052601020000
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_ECM30TDI0114G0907401Q 001003
   ROD: EV_ECM30TDI0114G0907401Q.rod
   VCID: 313C1CA2E1A58DAFE44-8064

No fault code found.
Readiness: 0 0 0 0 1 

-------------------------------------------------------------------------------
Address 02: Auto Trans (J217)       Labels:| 0B5-927-156.clb
   Part No SW: 4G2 927 156 P    HW: 0B5 927 156 K
   Component: 0B5 30 TDIRdW H02 0003  
   Revision: --H02---    
   Coding: 000001
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_TCMDL501021 001015
   ROD: EV_TCMDL501021.rod
   VCID: 3B203E8A33E977FF4E8-806E

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels:. 4G0-907-379-V1.clb
   Part No SW: 4G0 907 379 L    HW: 4G0 907 379 L
   Component: ESP PREMIUM   H09 0450  
   Revision: --------    Serial number: --------------
   Coding: 27A69F01E465F980DB00
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_ESPPremiAU57X 004039
   ROD: EV_ESPPremiAU57X_004_AU57.rod
   VCID: 3A2E3B8E3CD34EF755E-806E

3 Faults Found:
0604 - Tire Pressure Warning 
          C102D 00 [009] -  - 
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 2
                    Reset counter: 220
                    Mileage: 52166 km
                    Date: 2017.09.30
                    Time: 00:36:32

                    VzRef: 00
                    Bit Info 1: 00
                    Bit Info 2: 00
                    Bit Info 3: 02
                    Bit Info 4: 1F
                    F-Path: 01
                    F-Type: 2C
                    Uz: 95

0631 - Tire Pressure Warning 
          C102D 00 [009] -  - 
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 2
                    Reset counter: 220
                    Mileage: 52166 km
                    Date: 2017.09.30
                    Time: 00:36:32

                    VzRef: 00
                    Bit Info 1: 00
                    Bit Info 2: 00
                    Bit Info 3: 02
                    Bit Info 4: 1F
                    F-Path: 01
                    F-Type: 32
                    Uz: 95

0632 - Tire Pressure Warning 
          C102D 00 [009] -  - 
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 2
                    Reset counter: 220
                    Mileage: 52166 km
                    Date: 2017.09.30
                    Time: 00:36:32

                    VzRef: 00
                    Bit Info 1: 00
                    Bit Info 2: 00
                    Bit Info 3: 02
                    Bit Info 4: 1F
                    F-Path: 01
                    F-Type: 33
                    Uz: 95


-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. (J393)       Labels:. 8K0-907-064-05.clb
   Part No SW: 4H0 907 064 DN    HW: 4H0 907 064 DN
   Component: BCM2 2.0      H35 0510  
   Revision: 00002001    
   Coding: 01B93046000000000000
   Shop #: WSC 02391 785 00200
   VCID: 78AAE18642DF9CE763A-802C

   Subsystem 2 - Part No SW: 4H0 905 852 C    HW: 4H0 905 852 C
   Component: J764 ELV MLB  H40 0046 
   Serial number: 0213000355983016    

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels:* None
   Part No SW: 4G0 820 043 AK    HW: 4G0 820 043 AK
   Component: KLIMA 2 ZONEN H14 0094  
   Serial number: 19111300111683
   Coding: 3622000821
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_AirCondiBasisUDS 004002
   ROD: EV_AirCondiBasisUDS_004.rod
   VCID: 688AB1C612FF0C67F3A-803C

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 4H0-907-063-V1.clb
   Part No SW: 4H0 907 063 CF    HW: 4H0 907 063 F
   Component: BCM1 2.0      H12 0130  
   Revision: 20012002    Serial number: 00000001656539
   Coding: 2600201040349FE00181008300001D0C0F9DC70827090201000004606100
   Shop #: WSC 02391 785 00200
   VCID: 6E86C7DE309BD257B96-803A

   Subsystem 1 - Part No SW: 4G2 955 119     HW: 4G8 955 119 A  Labels: 1KX-955-119.CLB
   Component: WWS57X 131026  H36 0080 
   Serial number:         131028133554
   Coding: 0045F7

   Subsystem 2 - Part No SW: 8U0 955 559 B    HW: 8U0 955 559 B  Labels: 8U0-955-559.CLB
   Component: G397_RLFS  H06 0002 
   Serial number: 21962499            
   Coding: 02006D

   Subsystem 3 - Part No SW: 4G0 941 531 S    HW: 4G0 941 531 S
   Component: E1 - LDS  H07 0044 
   Serial number: 15 11 2013  00001329

   Subsystem 4 - Part No SW: 4G0 907 658 A    HW: 4G0 907 658 A
   Component: Humidity_Sens  H03 0002 
   Serial number: C028CBD6000000000001

No fault code found.

-------------------------------------------------------------------------------
Address 10: Park/Steer Assist (J446)       Labels:| 4H0-919-475-7X2.clb
   Part No SW: 4H0 919 475 AA    HW: 4H0 919 475 AG
   Component: PARKHILFE ACC H01 0083  
   Revision: 11001001    Serial number: 61061332700594
   Coding: 88C308
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_EPHVA18AU57X0000 004009
   ROD: EV_EPHVA18AU57X0000_003.rod
   VCID: 71BCDCA22125CDAFA44-8024

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:| 4H0-959-655.clb
   Part No SW: 4H0 959 655 C    HW: 4H0 959 655 C
   Component: Airbag10.43   H43 0040  
   Revision: --------    Serial number: 003JG00FRC9F
   Coding: 3032343631334E303537554A305234473053
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_AirbaAU10BPAAU64X 001014
   ROD: EV_AirbaAU10BPAAU64X_AU57.rod
   VCID: 36362FBE08CBAA97B16-8062

   Crash sensor for side airbag: driver side: 
   Serial number: 3575HRB400K50LNGGQ4 

   Crash sensor for side airbag: front passenger side: 
   Serial number: 3585HRB406123HNCCOU 

   Crash sensor for side airbag: rear: driver side: 
   Serial number: 3515JRB400450OCCLOLQ

   Crash sensor for side airbag: rear: passenger side: 
   Serial number: 3525JRB400G50OCCKHEO

   Crash sensor for front airbag: driver side: 
   Serial number: 3554VRB400Q50P7AAOI0

   Crash sensor for front airbag: front passenger side: 
   Serial number: 3564VRB400G50P7AQA1J

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel (J527)       Labels:. 4H0-953-568.clb
   Part No SW: 4G0 953 568 A    HW: 4G0 953 568 A
   Component: Lenks.Modul   H05 0201  
   Revision: 00000000    Serial number: 20131119000126
   Coding: 000035
   Shop #: WSC 02391 785 00200
   VCID: 303A19A6EA2F84A7EBA-8064

   Subsystem 1 - Part No SW: 4G0 951 528 A    HW: 4G0 951 528 A
   Component: E221 - MFL  H08 0010 

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 4H0-920-xxx-17.clb
   Part No SW: 4G8 920 984 H    HW: 4G8 920 984 H
   Component: TDieGb        H58 0621  
   Revision: 29460233    Serial number: 658051113596018
   Coding: 33A610000B412600010000
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_RBD4K 004048
   ROD: EV_RBD4K.rod
   VCID: 3B203E8A33E977FF4E8-806E

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:* None
   Part No SW: 4G0 907 468 AD    HW: 4G0 907 468 AC
   Component: J533--Gateway H13 0050  
   Revision: --------    Serial number: 00000001177849
   Coding: 00CD077D00
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_GatewPkoUDS 001019
   ROD: EV_GatewPkoUDS_001.rod
   VCID: 72BED3AE2423F6B75DE-8026

   Battery Monitoring Control Module: 
   Subsystem 1 - Part No SW: 8T0 915 181     HW: 8T0 915 181 
   Component: J367-BDMHella  H03 8041 
   Serial number: 6266341703          

   Voltage stabilizer: 

1 Fault Found:
0021 - Control Module Incorrectly Coded 
          U1014 00 [009] - -
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 220
                    Mileage: 52166 km
                    Date: 2017.09.30
                    Time: 00:36:36

                    Voltage terminal 30: 11.4 V
                    Voltage terminal 15: 11.5 V
                    Control Module temperature: 27 °C
                    System status: Terminal 15 on
                    IN ESP_standstill flag: standstill detected
                    Engine running: OFF
                    IN ZAS_Te_X: On
                    Terminal 15 status via CAN: On
                    Terminal 15 status: On
                    Datenfeld: 0


-------------------------------------------------------------------------------
Address 3B: Sensor Elect. (J849)       Labels: 4G0-907-637.clb
   Part No SW: 4G0 907 637 H    HW: 4G0 907 637 D
   Component: SARA 3D       H03 0056  
   Revision: --------    Serial number: EJ1BPA7207AD4.
   Shop #: WSC 00000 000 00000
   ASAM Dataset: EV_SARA2 005012
   ROD: EV_SARA2.rod
   VCID: 333016AA1BB9BFBF968-8066

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386)       Labels: None
   Part No SW: 4G8 959 793 J    HW: 4G8 959 793 G
   Component: TSG FA        H03 0507  
   Revision: --------    Serial number: --------------
   Coding: 011C16004001620002080002
   Shop #: WSC 02391 785 00200
   VCID: 47C8527A7FA1231FDA0-8012

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist (J500)       Labels:| 4G0-909-144.clb
   Part No SW: 4G0 909 144 L    HW: 4G0 909 144 G
   Component: RCEPS         H39 0010  
   Revision: 00001000    Serial number: 0004012430
   Coding: 101000010000
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_RCEPS 009008
   ROD: EV_RCEPS_009.rod
   VCID: 323E13AEE4A3B6B79DE-8066

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. (J393)       Labels:. 4H0-907-064-46.clb
   Part No SW: 4H0 907 064 DN    HW: 4H0 907 064 DN
   Component: BCM2 2.0      H35 0510  
   Revision: 00002001    Serial number: 0320254501    
   Coding: 013B0622A0B930008320090400010F470000000000000000000000000000
   Shop #: WSC 02391 785 00200
   VCID: 78AAE18642DF9CE763A-802C

   Subsystem 1 - Part No: 4G0 951 177 
   Component: DWA-Sensor  H01 0010 

   Subsystem 2 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HO  H05 1501 

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. (J387)       Labels: None
   Part No SW: 4G8 959 792 J    HW: 4G8 959 792 G
   Component: TSG BF        H03 0507  
   Revision: --------    Serial number: --------------
   Coding: 011C16004001620002080002
   Shop #: WSC 02391 785 00200
   VCID: 46D65F7E78AB3A17216-8012

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake (----)       Labels: 4H0-907-801.clb
   Part No SW: 4H0 907 801 G    HW: 4H0 907 801 A
   Component: EPB-4         H03 0014  
   Revision: --------    Serial number: 00000000883417
   ASAM Dataset: EV_ParkiBrake 001028
   ROD: EV_ParkiBrake_AU57.rod
   VCID: 2C020DD6C687E047D72-8078

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range (J431)       Labels:| 8X0-907-357.clb
   Part No SW: 4H0 907 357 B    HW: 4H0 907 357 B
   Component: ....LWR12.... H02 0010  
   Serial number: 131118-0004-033
   Coding: 1122A6101000A300
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_HeadlRegulBasic 005001
   ROD: EV_HeadlRegulBasic.rod
   VCID: 2D0400D2FD9DE94FC0C-8078

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio (R)       Labels: Redir Fail!
   Part No SW: 4G0 035 061 N    HW: 4G0 035 061 
   Component: Radio U DAB   H60 0139  
   Revision: AB001007    Serial number: 109KX0D7801241
   Coding: 010103020100000001
   Shop #: WSC 02391 785 00200
   VCID: 280AF1C6D2FFCC6733A-807C

No fault code found.

-------------------------------------------------------------------------------
Address 5F: Information Electr. (J794)       Labels:. 4E0-035-6xx-5F.clb
   Part No SW: 4G0 035 670 J    HW: 4G0 035 670 J
   Component: H-BNT-EU      H53 0798  
   Revision: --------    Serial number: 190K$0D7561451
   Coding: 050101010003A1ED05808B3E00000003000001000000000000
   Shop #: WSC 02391 785 00200
   VCID: 2A0E0BCECCF3FE7725E-807E

   Subsystem 1 - Part No: 8R0 060 884 BK
   Component: EUR 2014  1703 

   Subsystem 2 - Part No SW: 4G0 919 605 C    HW: 4G0 919 605 C
   Component: DU8 C7 SV  H43 0021 
   Serial number: AUZ8ZDDD0032E9D     

   Subsystem 3 - Part No SW: 4G2 919 610 C    HW: 4G2 919 610 C
   Component: E380 BDT C7  H11 0204 
   Serial number: 90349MKB0016E       

   Subsystem 4 - Part No: 8R0 060 961 F
   Component: CD-Database  5571 

No fault code found.

-------------------------------------------------------------------------------
Address 62: Door, Rear Left (J388)       Labels: None
   Part No SW: 4G8 959 795 J    HW: 4G8 959 795 G
   Component: TSG HL        H03 0507  
   Revision: --------    Serial number: --------------
   Coding: 010814004001620002080002
   Shop #: WSC 02391 785 00200
   VCID: 49CC544269B5D56FCC4-801C

No fault code found.

-------------------------------------------------------------------------------
Address 69: Trailer (J345)       Labels: Redir Fail!
   Part No SW: 4G8 907 383     HW: 4G8 907 383 
   Component: Anhaenger     H12 0100  
   Revision: 5G001001    Serial number: 00000428918291
   Coding: 0109080000000000
   Shop #: WSC 00000 000 00000
   VCID: 71BCDCA221A5CDAFA44-8024

1 Fault Found:
02588 - Swiveling Trailer Hitch 
            005 - No or Incorrect Basic Setting / Adaptation - MIL ON
             Freeze Frame:
                    Fault Status: 11100101
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 0
                    Time Indication: 0


-------------------------------------------------------------------------------
Address 6D: Trunk Elect. (----)       Labels:* Redir Fail!
   Part No SW: 4G9 959 107 B    HW: 4G9 959 107 A
   Component: HDSG-Modul    H03 0143  
   Revision: 14003001    Serial number: 313300260
   Coding: 097205C010
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_HDSGAu572 001022
   ROD: EV_HDSGAu571.rod
   VCID: 353428B215CDA18FB8C-8060

1 Fault Found:
0114 - Load Space Cover 
          B12EF 54 [137] - Missing Calibration / Basic Setting
          MIL ON - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 220
                    Mileage: 52166 km
                    Date: 2017.09.30
                    Time: 00:36:32

                    11.58 V


-------------------------------------------------------------------------------
Address 72: Door, Rear Right (J389)       Labels: None
   Part No SW: 4G8 959 795 J    HW: 4G8 959 795 G
   Component: TSG HR        H03 0507  
   Revision: --------    Serial number: --------------
   Coding: 010814004001620002080002
   Shop #: WSC 02391 785 00200
   VCID: 49CC544269B5D56FCC4-801C

No fault code found.

End----(Elapsed Time: 02:37, VBatt start/end: 11.4V/11.4V. VIgn 11.5V)-----

Uwe · Sep 30, 2017

tetley said:
The Westfalier instructions for coding are for VAS 5051, so no use for VCDS.

It would be interesting to see what they look like and to see just how "translatable" they are.

The obvious starting point would be to register the trailer module in the Gateway:
[Select]
[19-CAN Gateway]
[Installation List]
Scroll down to 69-Trailer and put a checkmark in the box.
[Save Coding]

-Uwe-

tetley · Sep 30, 2017

Uwe said:
It would be interesting to see what they look like and to see just how "translatable" they are.

The obvious starting point would be to register the trailer module in the Gateway:
[Select]
[19-CAN Gateway]
[Installation List]
Scroll down to 69-Trailer and put a checkmark in the box.
[Save Coding]

-Uwe-

Westfalier coding instructions for VAS 5051

Adjusting the coding
The AM code required can be found in the “coding supplement” on the Audi dealer portals (including ServiceNet).
– Connect a suitable vehicle diagnostic, testing and information system to the vehicle via an online connection, e.g. the vehicle
diagnostic, testing and information system -VAS 5051B-.
– Select (Functions and Components) ((Funktions und Bauteilauswahl)).
– Select the “Direct input of AM code for vehicle alteration” (“Direkteingabe AM-Code für Fahrzeugumbau”) testing programme
from within Action Management (AM).
– When prompted, enter the corresponding code (050 200).
– Code the control unit in the self-diagnosis using the VAS tester:
• 69 trailer function
o 008 Codierung
􀂃 Masterbyte-Index (Hex-Code):
0. ...
1. 09 -> 00
2. 08 -> 00
3. ...
4. ... etc.
– Call up the fault memory of all control units and delete the “Undervoltage” (“Unterspannung”) fault as necessary.
– Test towing functions using a suitable tester (with load resistors) or a trailer.

Uwe · Sep 30, 2017

OK, not terribly useful for the other modules.

For the trailer module, the instructions can be followed using VCDS.

Current trailer coding is:

01 09 08 00 00 00 00 00

They're suggesting you zero out byte 01 (current value 09) and byte 02 (current value 08).

Please stand by. Hopefully one of our European colleagues will be along with suggestions.

-Uwe-

tetley · Sep 30, 2017

So ending up with 0100000000000000 ?
I'll update the CAN gateway in the morning, and try the suggested coding. Nothing to loose!

Uwe · Sep 30, 2017

Yeah, for a retrofit of a non-retractable hitch, I believe 0100000000000000 makes sense.

-Uwe-

NEtech · Oct 1, 2017

You don't mention witch type towbar you have installed.

Instructions:
Disable start/stop with button (if installed)

Change WSC etc. to none zero in VCDS, see here.

[19-CAN Gateway] > [Installation list] > [69] > [Save coding]
See here. Uwe has explained this.

Explanation [Controller number] - New coding:

Code:

[09] - 2600201040349FE00181008300001D0C0F9DE70827090201000004606100
[46] - 013B0622A0B930008320090420010F470000000000000000000000000000
[01] - 12254012053601020000
[03] - 27A69F01E465F980FB00
[10] - 89C308
[6D] - 097205C011
[69] - 0100000000000000

[03] and [10] and [6D] need Secure Access before Coding.
[6D] = 20103

It could be a short wire on Towbar ECU connector, has to be changed.
Ask Westfalia if there is a problem with towbar ecu.

tetley · Oct 1, 2017

I've now updated the CAN gateway, and changed the trailer code to 0100000000000000, and all fault codes have now gone away. So it's now to recode the other modules. I had a peek in the parking sensor module, as I know this one does need recoding, and on the long coding helper there are 3 options for trailers. 1 Trailer without hitch 2 Trailer with manually removable hitch. 3 Trailer with pivot hitch.
Is 'trailer without a hitch' wiring loom fitted, but NO towbar fitted (ie for running a lighting board attached to bicycles hanging off a tailgate rack)
My towbar is manually removable with a key inserted into the side of the towbar, so presumably I need option 2?

Since doing this, NEtech has added to the thread.

When I get access to the car again, I'll try the rest of the coding.
03, 10, 6D need security access, is 20103 the login code for all 3 modules?
Also, disabling of the start / stop button is in the instructions, how is this done?
Thanks!

NEtech · Oct 1, 2017

tetley said:
03, 10, 6D need security access, is 20103 the login code for all 3 modules?

No the rest are showed when you go there.

tetley said:
Also, disabling of the start / stop button is in the instructions, how is this done?

Look at the buttons in you car, is there one for disable start/stop.

tetley · Oct 1, 2017

NEtech said:
No the rest are showed when you go there.

Look at the buttons in you car, is there one for disable start/stop.

I think I got the wrong end of the stick on this! I thought this was a process to disable the main start/stop button, ie the 'ignition switch' during coding.
I do have a button to disable the start/stop the engine when vehicle is stationary feature, is this it?

NEtech · Oct 1, 2017

Ign. ON
Press:

nugentp · May 22, 2019

This is a very useful thread as I have been looking at retrofitting a Westfalia detachable bar to the C7 allroad (MY13). I've been doing some homework before committing to buying anything yet and discovered something in the instructions for fitting the westfalia vehicle specific loom (305-385-300-113 for reference - its easily found at manufacturers website). The instructions show an option in the loom & module fitment if the car has trailer preparation from factory or not. The PR code for that is 1D8 and this wagon has it - not actually proved that by looking the rear right corner yet.

According to my understanding (and a bit of googling around other Audi forums) this means the car is pre-wired with the J345 trailer detection module (allegedly supplied by Westfalia as OE) where the T12m plug for fuses and brake light connection from J393 are wired up while a 2-pin plug (T2db on the OE diagrams for 1D8 option) for CAN connectivity is left dangling open until the day that the other side of trailer wiring is completed. This is also seen in a diagram for another vehicle specific loom supplied by UK towbar specialist pfjones.

This got me wondering as when I look at the wiring for PR-1D4 where the complete towbar is factory fitted - there is a T12n plug connection up to some extra warning lights (not in the dashboard presumably but I have no clue where*) and a contact switch (F355) as part of the swivelling BOSAL bar which tells the factory fitted controller when the hitch is locked in place.

The question is whether I can just buy the mechanical section of the Westfalia towbar, build or buy the loom for the 16-pin connection from J345 to the trailer socket and code up the OE trailer module as if it was for a detachable hitch i.e not swivelling and not expecting the switch or lamp connectivity.

Seems kind of crazy to have the trailer preparation module factory fitted then move the plug from that to a new vehicle specific controller just cos that comes bundled with the wiring to the hitch plug. It might also avoid another round of component protection fun. Of all the things in the car, I don't need a cold standby trailer recognition module.

First step might be to connect that 2-pin OE plug for the CAN bus and verify what trailer connector and coding is detected & changeable by VCDS.

I know CAN messages tell the PDC sensors and ESP/ABS when trailer is attached but presumably something lights on the dashboard as a visual reminder for the driver.

I am also wondering if I can manually control something simulating the F355 switch destined for the 'hitch locked signal' as most time the hitch will be used is for a bike rack so there is no need to change behaviour of ESP/ABS in that instance.

Some further investigation required.

* UPDATE - After a quick RTFM, I discovered the indicator lamps referenced on the OE trailer wiring diagram sit with the handle for extending or retracting the swivel bar - seems like when its locked up or down, the light is green, but when its in between the lamp is flashing red.

nugentp · May 22, 2019

So I found this contender for the loom to complete a 1D8 optioned car into having the towbar completed.

nugentp · May 22, 2019

Of course the price of that lovely OE loom is eye-watering - much more expensive than buying the vehicle specific kit from Westfalia, but it shouldn't be rocket science to clone it as there is only one 16-pin plug of any special note.

nugentp · May 22, 2019

Quick update - stuck my head in the right rear corner and sure enough trailer preparation is there so that will save a lot of work. Turns out that 12-pin plug just sits in an empty binnacle waiting to be used so the trailer detection module is not equipped as I had assumed above. And yes there is a separate foam covered 2-pin plug for the CAN bus sitting beside the 12-pin plug. Thats all good as it saves a lot of time removing the rear inner trim to access J393 and those extra fuse points.

Added a pic of the C7 trailer prep. The red plug is T12m and the foam covered unplugged thing is T2bd. Gonna see if I can source the other 12-pin plug (T12n) and maybe experiment with the hitch locked switch to see if it gets me anywhere.

CODING WESTFALIER TOWBAR AND OTHER MODULES A6 C7 2014

tetley

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