VW Touareg 2014 retrofit trailer module issue

   #1  

JonesyGT

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I recently retrofitted a trailer module to my 2014 (UK) Touareg and I'm having an issue with the brake lights on my caravan.

All other lights work correctly, Indicators, reverse, fog, sidelights/marker lights just the brake lights.

When connected the brake lights remain illuminated on my caravan but work normally on the car.

The following fault code is logged on the Trailer module;

1 Fault Found:
00526 - Brake Light Switch (F)
008 - Implausible Signal
Freeze Frame:
Fault Status: 01101000
Fault Priority: 3
Fault Frequency: 1
Reset counter: 152
Mileage: 78936 km
Time Indication: 0
Date: 2020.09.13
Time: 18:44:11

If i keep the brake pedal depressed and clear the code it doesnt return until I release the brakes.

But no faults are logged on the ABS module.

Any help would be greatly appreciated as I'm now pulling my hair out!!

Code:
Monday,14,September,2020,20:12:22:34416
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 20.4.2.0 (x64)  HEX-V2 CB: 0.4526.4
Data version: 20200730 DS317.0
www.Ross-Tech.com


VIN: WVGZZZ7PZED051777   License Plate:
Mileage: 78936km-49048mi   Repair Order:



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


Chassis Type: 7P-VW52 (7P6)
Scan: 01 02 03 05 08 09 10 15 16 17 19 42 46 52 53 55 56 5F 62 65
          69 6D 72

VIN: WVGZZZ7PZED051777   Mileage: 78936km-49048miles

01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
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
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: Malfunction 0010
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: Malfunction 0010
5F-Information Electr. -- Status: Malfunction 0010
62-Door, Rear Left -- Status: OK 0000
65-Tire Pressure -- Status: OK 0000
69-Trailer -- Status: Malfunction 0010
6D-Trunk Elect. -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (J623-CRCA)       Labels:. 059-907-401-V2.clb
   Part No SW: 7P0 907 401 F    HW: 4G0 907 401
   Component: 3.0TDI EDC17  H41 0007
   Revision: 53H41---  
   Coding: 292A4012233601020000
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_ECM30TDI0117P0907401F 001008
   ROD: EV_ECM30TDI_VW52.rod
   VCID: 323D1ED864A7069B947-8066

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

-------------------------------------------------------------------------------
Address 02: Auto Trans (J217)       Labels:| 0C8-927-750.clb
   Part No SW: 0C8 927 750 BQ    HW: 0C8 927 750 BQ
   Component: AL1000 AISIN  002 2530
   Serial number:              
   Coding: 003568
   Shop #: WSC 54823 001 1048576
   ASAM Dataset: EV_TCMAL991031 002115
   ROD: EV_TCMAL991031_002.rod
   VCID: 7CA1F0E0F66300EB0EB-8028

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels:* 7P0-907-379.clb
   Part No SW: 7P0 907 379 P    HW: 7P0 907 379 A
   Component: MK25A         H36 0446
   Revision: --------    Serial number: 413040010EC818
   Coding: 5B6B13C309292554DAFBC89A90D9A450F700
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_MK25AXT 008001
   ROD: EV_ESPMK25A00800.rod
   VCID: 4ACD6638EC376E5BCC7-801E

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. (J393)       Labels:. 8K0-907-064-05.clb
   Part No SW: 4H0 907 064 FH    HW: 4H0 907 064 EH
   Component: BCM2 2.0      H36 0551
   Revision: 00002001  
   Coding: 05B60016000000000000
   Shop #: WSC 31414 790 00001
   VCID: 74B1D8C0DEB348AB46B-8020

   Subsystem 1 - Part No SW: 4H0 905 852 B    HW: 4H0 905 852 B
   Component: J764 ELV MLB  H40 0046
   Serial number: 0214000095983009  

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels:| 7P6-907-040.clb
   Part No SW: 7P6 907 040 BR    HW: 7P6 907 040 BR
   Component: Klima 2 Zonen H21 1306
   Coding: B6A6000890
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_AirCondiFront 004001
   ROD: EV_AirCondiFront_VW52.rod
   VCID: 0557950485A94123615-8050

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 4H0-907-063-V1.clb
   Part No SW: 4H0 907 063 CD    HW: 4H0 907 063 D
   Component: BCM1 2.0      H12 0130
   Revision: 15012002    Serial number: 00000001759107
   Coding: 26001010D1345D010021000300005D0C431D670807010241000000020000
   Shop #: WSC 31414 790 00001
   VCID: 6C81C0A08683906B9EB-8038

   Subsystem 1 - Part No SW: 7P0 955 120     HW: 7P0 955 120
   Component: WWS    140523  033 0021
   Serial number: 90243401140526224147
   Coding: 004DBD

   Subsystem 2 - Part No SW: 7P0 955 559 E    HW: 7P0 955 559 E  Labels: 8K0-955-559.CLB
   Component: RLFS  H10 0020
   Serial number: 20330647          
   Coding: 025223

   Subsystem 3 - Part No SW: 7P6 941 431     HW: 7P6 941 431
   Component: E1 - LDS  H04 0031
   Serial number: 00000000000406140320

No fault code found.

-------------------------------------------------------------------------------
Address 10: Park/Steer Assist (J446)       Labels:| 7P6-919-475.clb
   Part No SW: 7P6 919 475 C    HW: 7N0 919 475
   Component: PARKHILFE 8K  H05 0026
   Revision: --------    Serial number: 28261415801352
   Coding: 118501
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_VW526ParkiAssis2 001012
   ROD: EV_VW526ParkiAssis2.rod
   VCID: 43D34B1CCB1DBF130F1-8016

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:| 7P0-959-655.clb
   Part No SW: 7P0 959 655 E    HW: 7P0 959 655 E
   Component: VW10Airbag00K H10 0043
   Revision: --------    Serial number: 003NK0005F1O
   Coding: 00000000000000000000000000000000304B
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_AirbaVW10BPAVW526 002001
   ROD: EV_AirbaVW10BPAVW526_002_VW52.rod
   VCID: 43D34B1CCB1DBF130F1-8016

   Crash sensor for side airbag: driver side:
   Serial number: 3575LRB40532KTAQ907M

   Crash sensor for side airbag: front passenger side:
   Serial number: 3585LRB40512KTAQ9HH5

   Crash sensor for side airbag: rear: driver side:
   Serial number: 3517ARB404V2KSNMKGU6

   Crash sensor for side airbag: rear: passenger side:
   Serial number: 3527ARB40512KSNMJGVL

   Crash sensor for front airbag: driver side:
   Serial number: 3557BRB40572N22071D6

   Crash sensor for front airbag: front passenger side:
   Serial number: 3567BRB40552N220NHS9

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel (J527)       Labels:. 4H0-953-568.clb
   Part No SW: 4H0 953 568 H    HW: 7P6 953 507 M
   Component: Lenks.Modul   H04 0005
   Revision: --------    Serial number: 01335NF7000L4
   Coding: 000C35
   Shop #: WSC 31414 790 00001
   VCID: 38292CF0825BECCBAA3-806C

   Subsystem 1 - Part No SW: 7P6 959 542 A    HW: 7P6 959 542 A
   Component: E221__MFL-TAS  H04 0028
   Serial number: 0051478 TRW 20140512

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 7P6-920-xxx-17.clb-SRI1
   Part No SW: 7P6 920 982 S    HW: 7P6 920 982 S
   Component: Kombi         H13 0419
   Revision: 13240270    Serial number: 658050614592034
   Coding: 332731002B00260001000C
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_KombiUDSRBVW526 001020
   ROD: EV_KombiUDSRBVW526.rod
   VCID: 4EC56A28105F427B90F-801A

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:* None
   Part No SW: 7P6 907 530 J    HW: 7P6 907 530 F
   Component: GW-CAN-L-MOST H13 6032
   Revision: --------    Serial number: 00000001422112
   Coding: 000D07AD00
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_GatewVW526UDS 001007
   ROD: EV_GatewUDS_VW52.rod
   VCID: 3FDB47ECA7F5DBF36B9-806A

   Battery Monitoring Control Module:
   Subsystem 1 - Part No SW: 7P0 915 181 B    HW: 7P0 915 181
   Component: Batt_Sensor  H07 0190
   Serial number: 31155I58005701372736

   Voltage stabilizer:
   Subsystem 2 - Part No SW: 7PP 959 663 E    HW: 7PP 959 663 E
   Component: J532_DCDCStab  H17 0042
   Serial number: 14148003697021200181

1 Fault Found:
16384 - Function Restriction due to Driver Fatigue Recognition
          B130E 00 [008] - -
          [Funktionseinschraenkung Pausenempfehlung]
          Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 191
                    Mileage: 78912 km
                    Date: 2020.09.13
                    Time: 10:01:55

                    Voltage terminal 30: 14.5 V
                    Voltage terminal 15: 14.5 V
                    Control Module temperature: 39 °C
                    System status: Terminal 15 on
                    IN ESP_standstill flag: no standstill detected
                    Engine running: On
                    IN ZAS_Te_X: On
                    Terminal 15 status via CAN: On
                    Terminal 15 status: On
                    Datenfeld: 0


-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386)       Labels:. 4H0-959-793.clb
   Part No SW: 4H0 959 793 AC    HW: 4H0 959 793 P
   Component: TSG FA        H02 0306
   Revision: --------    Serial number: 0000105123973
   Coding: 011D1620D001451005080002
   Shop #: WSC 31414 790 00001
   VCID: 7AADF6F8FCD73EDB1C7-802E

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. (J393)       Labels:. 4H0-907-064-46.clb
   Part No SW: 4H0 907 064 FH    HW: 4H0 907 064 EH
   Component: BCM2 2.0      H36 0551
   Revision: 00002001    Serial number: 0337008685  
   Coding: 019B1E2228B9109583200624210000000000000000000000000000000000
   Shop #: WSC 31414 790 00001
   VCID: 74B1D8C0DEB348AB46B-8020

   Subsystem 1 - Part No: 7P6 951 171
   Component: DWA-Sensor  002 0204

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

   Subsystem 3 - Part No SW: 7P0 959 591 B    HW: 7P0 959 591 B
   Component: J245 PS30.055  H01 0008
   Serial number:     WOO29690505    
   Coding: 191100

   Subsystem 4 - Part No SW: 7P0 959 591 C    HW: 7P0 959 591 C
   Component: J394 PS30.055  H01 0008
   Serial number:     WOO2943858D    
   Coding: 191100

1 Fault Found:
01134 - Alarm Horn (H12)
            008 - Implausible Signal - Intermittent
             Freeze Frame:
                    Fault Status: 00101000
                    Fault Priority: 2
                    Fault Frequency: 37
                    Reset counter: 192
                    Mileage: 78820 km
                    Time Indication: 0
                    Date: 2020.09.12
                    Time: 12:28:02


-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. (J387)       Labels:. 4H0-959-792.clb
   Part No SW: 4H0 959 792 S    HW: 4H0 959 792 M
   Component: TSG BF        H02 0306
   Revision: --------    Serial number: 0000104741493
   Coding: 011D1620D001451005080000
   Shop #: WSC 31414 790 00001
   VCID: 48C95C30F2BB9C4BDA3-801C

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake (J540-)       Labels:| 7P0-907-801.clb
   Part No SW: 7P0 907 801 F    HW: 7P0 907 801 F
   Component: EPB           H51 1201
   Revision: 00000000    Serial number: C1452400835  
   Coding: 01040100
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_ParkbA7 000006
   ROD: EV_ParkbA7.rod
   VCID: 363522C888CF1ABBB8F-8062

   Slave 3:

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range (J745)       Labels:. 7P6-907-357.clb
   Part No SW: 7P6 907 357     HW: 7L6 907 357 C
   Component: AFS-ECU       H04 0110
   Revision: --------    Serial number: --------------
   Coding: 018E00000F000200
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_HeadlRegulVWAFS 005006
   ROD: EV_HeadlRegulVWAFS_VW52.rod
   VCID: 7CA1F0E0F66300EB0EB-8028

   Left_headlamp_power_output_stage:
   Subsystem 1 - Part No SW: 8U0 941 329     HW: 8U0 941 329   Labels: 3D0-941-329.CLB
   Component: LeiMo links  H01 0003
   Coding: 130000

   Right_headlamp_power_output_stage:
   Subsystem 2 - Part No SW: 8U0 941 329     HW: 8U0 941 329   Labels: 3D0-941-329.CLB
   Component: LeiMo rechts  H01 0003
   Coding: 130000

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: 109F%0E7933509
   Coding: 010105020100000003
   Shop #: WSC 31414 790 00001
   VCID: 2809FCB052FB7C4B3A3-807C

1 Fault Found:
03278 - Functionality Limited due to Missing Messages
            000 - - - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 6
                    Fault Frequency: 3
                    Reset counter: 190
                    Mileage: 78849 km
                    Time Indication: 0
                    Date: 2020.09.12
                    Time: 21:36:45

             Freeze Frame:
                    Bin. Bits: 00000000 00101100


-------------------------------------------------------------------------------
Address 5F: Information Electr. (J794)       Labels:. 4E0-035-6xx-5F.clb
   Part No SW: 7P6 035 670 G    HW: 7P6 035 670 A
   Component: H-BNT-EU      H40 0822
   Revision: --------    Serial number: 444F.0EB001791
   Coding: 010101050040E1ED01000B0E00000003F00401030000000000
   Shop #: WSC 31414 790 00001
   VCID: 392F29F4B951F5C355D-806C

   Subsystem 1 - Part No: 8R0 060 884 BT
   Component: EUR 2014  1903

   Subsystem 2 - Part No SW: 7P6 919 603     HW: 7P6 919 603
   Component: DU8 SV Touch  H27 0045
   Serial number: VWZ8Z9PA2018CD    

   Subsystem 3 - Part No SW: 7P6 919 603     HW: 7P6 919 603
   Component: DU8 SV Touch  H27 0045
   Serial number: VWZ8Z9PA2018CD    

   Subsystem 4 - Part No: 8R0 060 961 G
   Component: CD-Database  5950

2 Faults Found:
03157 - Functionality limited due to Communications Disruption
            000 - - - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 6
                    Fault Frequency: 11
                    Reset counter: 190
                    Mileage: 78849 km
                    Time Indication: 0
                    Date: 2020.09.12
                    Time: 21:36:45

             Freeze Frame:
                    Bin. Bits: 10110111 10000010
                    Bin. Bits: 00000000 00001110
                    Bin. Bits: 00000000 00000000
                    Bin. Bits: 00000000 00000000
                    Bin. Bits: 00000000 00000000

03278 - Functionality Limited due to Missing Messages
            000 - - - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 6
                    Fault Frequency: 12
                    Reset counter: 190
                    Mileage: 78849 km
                    Time Indication: 0
                    Date: 2020.09.12
                    Time: 21:37:05

             Freeze Frame:
                    Bin. Bits: 00011110 00011111
                    Bin. Bits: 00000000 00011010


-------------------------------------------------------------------------------
Address 62: Door, Rear Left (J388)       Labels:. 4H0-959-795.clb
   Part No SW: 4H0 959 795 P    HW: 4H0 959 795 J
   Component: TSG HL        H03 0306
   Revision: --------    Serial number: 0000105908883
   Coding: 011814200001251005080000
   Shop #: WSC 31414 790 00001
   VCID: 48C95C30F2BB9C4BDA3-801C

No fault code found.

-------------------------------------------------------------------------------
Address 65: Tire Pressure (J502)       Labels: 3Y0-907-273.clb
   Part No SW: 7P6 907 273 K    HW: 7P6 907 273 K
   Component: RDKBERU25     H09 0009
   Serial number: 10000000139915
   ASAM Dataset: EV_RDKBERU25 003006
   ROD: EV_RDKBERU25_VW52.rod
   VCID: 44D14800CE13B82B36B-8010

No fault code found.

-------------------------------------------------------------------------------
Address 69: Trailer (J345)       Labels: Redir Fail!
   Part No SW: 7P0 907 383 F    HW: 7P0 907 383 B
   Component: Anhaenger     H12 0110
   Revision: 5A001001    Serial number: 00000497130792
   Coding: 0100000000000000
   Shop #: WSC 00000 000 00000
   VCID: 3B2333FCB36DC7D3471-806E

1 Fault Found:
00526 - Brake Light Switch (F)
            008 - Implausible Signal
             Freeze Frame:
                    Fault Status: 01101000
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 152
                    Mileage: 78936 km
                    Time Indication: 0
                    Date: 2020.09.13
                    Time: 18:44:11


-------------------------------------------------------------------------------
Address 6D: Trunk Elect. (----)       Labels:| 7N0-959-107.clb
   Part No SW: 7P6 959 107 C    HW: 7P6 959 107
   Component: HDSG-Modul    H10 0043
   Revision: 22010001    Serial number: 145400804
   Coding: 0533314003
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_HeckkTouar 202142
   ROD: EV_HeckkTouar.rod
   VCID: 3FDB47ECA7F5DBF36B9-806A

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right (J389)       Labels:. 4H0-959-795.clb
   Part No SW: 4H0 959 795 P    HW: 4H0 959 795 J
   Component: TSG HR        H03 0306
   Revision: --------    Serial number: 0000105819320
   Coding: 011814200001251005080000
   Shop #: WSC 31414 790 00001
   VCID: 48C95C30F2BB9C4BDA3-801C

No fault code found.

End----------(Elapsed Time: 01:55, VBatt start/end: 12.6V/12.3V)-----------
 
Last edited:
   #2  

JonesyGT

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Does anyone know what could cause an implausible signal?
 
   #3  

NEtech

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Could be problems with correct Kl.15 (ignition) and Kl.30 (Battery) connection/ functioning .
 
   #4  

JonesyGT

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Could be problems with correct Kl.15 (ignition) and Kl.30 (Battery) connection/ functioning .
The power for the trailer loom is currently connected to the fused side of ‘F3’ in the battery fuse box. There is no terminal 15 connection unless it’s from fuse 42 in the fuse box in the end of the dash.
 
   #5  

Dana

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That sounds like feedback from the trailer (caravan) into the vehicle. If they don't shut off with the ignition that may help narrow it down.

Have you checked the caravan brake light wiring and/or attempted to unplug any of them to make sure the brake light behavior doesn't change when one is unplugged? I suppose the difficulty level of doing so is going to depend on LED assemblies versus incandescent bulbs that you can pull one at a time.
 
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   #6  

JonesyGT

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That sounds like feedback from the trailer (caravan) into the vehicle. If they don't shut off with the ignition that may help narrow it down.

Have you checked the caravan brake light wiring and/or attempted to unplug any of them to make sure the brake light behavior doesn't change when one is unplugged? I suppose the difficulty level of doing so is going to depend on LED assemblies versus incandescent bulbs that you can pull one at a time.
Hi Dana, I’ve done quite a bit of fault finding now, the fault code reappears instantly even when my caravan isn’t attached, same with the socket loom disconnected from the module.
 
   #7  

Dana

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Ouch, I wasn't expecting that at all. It isn't the caravan in that case and the vehicle side harness from trailer module to trailer connector at the bumper should also be excluded at this point.

The wring to the trailer module must be responsible because the Coding appears to be OK. Your PR-Code is 1D0 Without trailer hitch. Am I correct in ASSuming that there wasn't any factory wiring ready to plug and play the trailer module into? If so, we might need to pop into a wiring diagram to try to figure out if there's an issue per Netech's suggestion.
 
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   #8  

JonesyGT

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Hi Dana, that’s correct, the kit (westfalia) came with a wiring harness. It makes connections at the fuse box which is then powered by a connection at F3 (terminal 30?) at the battery and also fuse 42 (terminal 15?) which already had the power side to it. 3 connections were then made at the BCM2 control unit, orange/brown, orange/green (black connector) and black/red (grey connector).

The only other fault I have that’s reoccurring is the alarm horn also keeps throwing an implausible code. If there is a fault there could that be disrupting the signal? although I would of thought the ABS module would pick it up too??? I’m lost now!!

EDIT - just to add when I go to group 8 in measuring blocks on the trailer module I can see the first two boxes changing from no to yes as I press and release the brake pedal. One is marginally slower than the other depending upon pedal pressure but they both change.
 
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   #9  

Dana

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OK, I took a peek at the Wiring Diagram labeled Touareg Trailer coupling From April 2010 (Current Flow Diagram No. 19 / 1) and it shows up to 5 possible power sources depending on production splits and equipment. At the least I'd expect 4 fused powers to be necessary based on what I see there. If you don't already have diagrams I'd recommend obtaining them from erWin VW. We need to tread very lightly but I can offer you this (temp) link with the page #1 info:


There's also a Preparation for trailer coupling From April 2010 diagram which may be easier to follow.

Either way, I would make sure all of powers are OK and wired to the correct source (switched versus unswitched) before chasing the brake light connection. On that note however, brake light splice B335 is shown in the Engine diagram where it splices to BCM2/J393 (Address 46, the guy with the new alarm DTC), the brake switch and the engine controller. That direct connection, rather than lighting commands shared over a databus, may explain why all of the other functions are OK with the exception of brake lights.
 
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   #10  

JonesyGT

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Hi Dana many thanks for the reply, i think I have now fixed it! I was talking to the technical line yesterday who was baffled, what he did tell me was that my car didn’t need the black/red wire as the module can sense the brake signal through the canbus. So I disconnected it last night and returned the factory pin back to its slot. I tested it today on a trailer at work and now they are working!! (the same trailer also had the issue of brake lights always on)
 
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Dana

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Excellent! If you have issues with your caravan at home bump this back up.

In that case I could take a peek at my husband's 7P T'reg wiring at the factory installed module if needed. It would be interesting to see which wires are actually in-use and see if the NAR wiring diagrams are any different than the ones I checked for your vehicle.
 
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