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Thread: Tow bar retrofit - No response from controller - Now what?

  1. #1
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    Tow bar retrofit - No response from controller - Now what?

    I'm doing a tow bar retrofit on my 2011 Passat B7 euro spec. Got the Westfalia swivel tow bar (3AA 803 880 E) from a scrap yard and the control unit (7N0 907 383) came with it. Wiring harness was purchased from Kufatec and came with decent (not great) instructions. Wired everything up, added address 69 - Trailer and the result was: No response from controller.

    So now the fun begins. Here are the schematics on the trailer detection control unit from Erwin:



    It seems that out of the three connectors on the control unit only T12g is of relevance to this problem. Connectors T16b and T12ae are mostly wiring between the control unit and the tow bar itself and tow bar trunk button. Using a multimeter I found that T12g/9 (--> SB4), T12g/11 (--> SC25) and T12g/12 (--> SC23) has +12V constant and T12g/2 (--> SC4) has 12V on ignition. T12g/5 (--> SC36) is wired through a relay and measured 0V - not sure when this relay is open? Grounding points for both the control unit and the relay has been re-checked and seems fine.

    Some time ago I retrofitted bi-xenon headlights with the headlight range module and for some reason placed the module behind the hood release lever trim panel. Back then I had to splice onto the CAN high/low wires aaaaaall the way up there by the CAN gateway, which was such a major PITA that I didn't want to do that again for the tow bar install. Instead I tapped onto the CAN wires going to the headlight range module, as seen on the below picture. The orange wires are going from the CAN gateway to the headlight range module. The white wires are going to the trailer detection control unit.



    I don't have the equipment to measure CAN signals, but I did remove the T26 connector on the headlight range module to do a continuity check. T26/2 --> T12g/7 (CAN-h), T26/3 --> T12g/8 (CAN-l). Found no issues.

    Code:
    Sunday,21,July,2019,00:05:58:22644
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 18.9.1.0 (x64)
    Data version: 20190114 DS296.0
    www.Ross-Tech.com
    
    
    VIN: WVWZZZ3CZBE325045   License Plate: 
    Mileage: 107270km-66654mi   Repair Order: 
    
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Chassis Type: 3C-VW46 (7N0)
    Scan: 01 02 03 08 09 10 13 14 15 16 17 18 19 20 22 25 36 37 42 44
              46 47 4F 52 53 55 56 61 62 65 69 6C 6D 72 77
    
    VIN: WVWZZZ3CZBE325045   Mileage: 107270km-66654miles
    
    01-Engine -- Status: OK 0000
    02-Auto Trans -- Status: OK 0000
    03-ABS Brakes -- Status: Malfunction 0010
    04-Steering Angle -- Status: OK 0000
    08-Auto HVAC -- Status: OK 0000
    09-Cent. Elect. -- Status: Malfunction 0010
    10-Park/Steer Assist -- Status: OK 0000
    13-Auto Dist. Reg -- Status: OK 0000
    14-Susp. Elect. -- Status: OK 0000
    15-Airbags -- Status: OK 0000
    16-Steering wheel -- Status: OK 0000
    17-Instruments -- Status: OK 0000
    18-Aux. Heat -- Status: OK 0000
    19-CAN Gateway -- Status: Malfunction 0010
    20-High Beam Assist. -- Status: OK 0000
    22-AWD -- Status: OK 0000
    25-Immobilizer -- Status: OK 0000
    36-Seat Mem. Drvr -- Status: OK 0000
    37-Navigation -- Status: OK 0000
    42-Door Elect, Driver -- Status: OK 0000
    44-Steering Assist -- Status: OK 0000
    46-Central Conv. -- Status: Malfunction 0010
    47-Sound System -- Status: OK 0000
    4F-Centr. Electr. II -- 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
    61-Battery Regul. -- Status: OK 0000
    62-Door, Rear Left -- Status: OK 0000
    65-Tire Pressure -- Status: OK 0000
    69-Trailer -- Status: Cannot be reached 1100
    6C-Back-up Cam. -- Status: OK 0000
    6D-Trunk Elect. -- Status: OK 0000
    72-Door, Rear Right -- Status: OK 0000
    77-Telephone -- Status: OK 0000
     
    -------------------------------------------------------------------------------
    Address 01: Engine (J623-CFGB)       Labels:. 03L-906-018-CFF.clb
       Part No SW: 03L 906 018 BN    HW: 03L 907 309 N
       Component: R4 2.0l TDI   H24 9977  
       Revision: 47H24---    Serial number: 00000000000000
       Coding: 001D003A046601080000
       Shop #: WSC 40190 222 00000
       ASAM Dataset: EV_ECM20TDI01103L906018BN 003007
       ROD: EV_ECM20TDI01103L906018BN.rod
       VCID: 77D302B3CE9530F2EC-8022
    
    No fault code found.
    Readiness: 0 0 0 0 0 
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans        Labels: 02E-927-770.clb
       Part No SW: 02E 300 013 M    HW: 02E 927 770 AL
       Component: GSG DSG AG6     511 2601  
       Revision: 05351112    Serial number: 00001011091155
       Coding: 0000020
       Shop #: WSC 05311 000 00000
       VCID: 1B1B3E03DAFDB49228-804E
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 3AA-614-109.clb
       Part No SW: 3AA 614 109 P    HW: 3AA 614 109 P
       Component: J104   C2 450M V57C 0011  
       Revision: --H07---    Serial number: 00000003272703
       Coding: 0121279
       Shop #: WSC 05311 000 00000
       VCID: 3A55DB877507ED9AD3-806E
    
    1 Fault Found:
    01517 - Control Module for Trailer/Towing Sensor (J345) 
                004 - No Signal/Communication
                 Freeze Frame:
                        Fault Status: 01100100
                        Fault Priority: 3
                        Fault Frequency: 1
                        Reset counter: 124
                        Mileage: 107270 km
                        Time Indication: 0
                        Date: 2013.12.11
                        Time: 05:05:59
    
                 Freeze Frame:
                        Speed: 0.0 km/h
                        Hex Value: 0x0000
                        Bin. Bits: 00000000 00000000
                        Voltage: 12.00 V
                        Bin. Bits: 00011111
                        Count: 300
                        Hex Value: 0x0000
    
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC (J255)       Labels:| 5K0-907-044.clb
       Part No SW: 3AA 907 044 AJ    HW: 3AA 907 044 AJ
       Component: Climatronic   H03 0303  
       Revision: 00001K02    
       Coding: 0014004802
       Shop #: WSC 00015 115 00000
       ASAM Dataset: EV_Climatronic A01010
       ROD: EV_ClimaAutoBasis_VW46.rod
       VCID: 78D1018FC38B3F8AE5-802C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect. (J519)       Labels:. 3AA-937-087.clb
       Part No SW: 3AA 937 087 A    HW: 3AA 937 087 A
       Component: BCM PQ47 H    413 0452  
       Revision: BB413001    
       Coding: 0002000000000000000C008874000DEC43D56388676DA5607F80C7240041
       Shop #: WSC 05311 123 12345
       VCID: 3851C18F8B0BFF8A25-806C
    
       Subsystem 1 - Part No SW: 3AB 955 419     HW: 3AB 955 419   Labels: 1KX-955-119.CLB
       Component: Wischer 16111  10  0603 
       Coding: 00B795
    
       Subsystem 2 - Part No: 1K0 955 559 AH  Labels: 1K0-955-559-AG.CLB
       Component: RLS 081210 05  54  0403 
       Coding: 035028
    
    2 Faults Found:
    01504 - Bulb for License-Plate Light (X) 
                010 - Open or Short to Plus
                 Freeze Frame:
                        Fault Status: 01101010
                        Fault Priority: 2
                        Fault Frequency: 1
                        Reset counter: 124
                        Mileage: 107270 km
                        Time Indication: 0
                        Date: 2013.12.11
                        Time: 05:06:17
    
                 Freeze Frame:
                            Term 15 On
                        Voltage: 12.20 V
                            ON
                            ON
                            ON
                            OFF
                            OFF
    
    01517 - Control Module for Trailer/Towing Sensor (J345) 
                004 - No Signal/Communication
                 Freeze Frame:
                        Fault Status: 01100100
                        Fault Priority: 6
                        Fault Frequency: 1
                        Reset counter: 124
                        Mileage: 107270 km
                        Time Indication: 0
                        Date: 2013.12.11
                        Time: 05:06:17
    
                 Freeze Frame:
                            Term 15 On
                        Voltage: 12.20 V
                            ON
                            ON
                            ON
                            OFF
                            OFF
    
    
    -------------------------------------------------------------------------------
    Address 10: Park/Steer Assist (J791)       Labels:| 3AA-919-475.clb
       Part No SW: 3AA 919 475 D    HW: 3AA 919 475 A
       Component: PARKHILFE PLA H04 0007  
       Revision: --------    Serial number: 20431034500293
       Coding: 308306
       Shop #: WSC 99999 123 12345
       ASAM Dataset: EV_EPHVA2C000000000 001006
       ROD: EV_EPHVA2C000000000_001_VW36.rod
       VCID: 3C59DD9FB733D3AAC1-8068
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 13: Auto Dist. Reg        Labels: 3AA-907-567.clb
       Part No SW: 3AA 907 567     HW: 3AA 907 567 
       Component: AC201  RDW A    031 0143  
       Revision: 00031000    Serial number: 00000000078439
       Coding: 0010000
       Shop #: WSC 05311 000 08193
       VCID: 77D302B3069530F2EC-8022
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 14: Susp. Elect. (J250)       Labels:. 3C0-907-376.clb
       Part No SW: 3C0 907 376 A    HW: 3C0 907 376 
       Component: DAEMPFUNGS-SG H07 0071  
       Revision: 00000000    Serial number: 23111002930001
       Coding: 030180
       Shop #: WSC 05314 000 00000
       VCID: 277312F356B56072BC-8072
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 5N0-959-655.lbl
       Part No SW: 5N0 959 655 R    HW: 5N0 959 655 R
       Component: J234__101 VW10 HI   1918  
       Revision: 22014000    Serial number: 003K0PQS5JZW  
       Coding: 0012337
       Shop #: WSC 05311 000 00000
       VCID: 4CB98D5F2F93632A71-8018
    
       Subsystem 1 - Serial number: 6332MTS673593060 
    
       Subsystem 2 - Serial number: 6342MTS651483070 
    
       Subsystem 3 - Serial number: 6351HTS6VLNTH9KR 
    
       Subsystem 4 - Serial number: 6361HTS6PHRTF6KJ 
    
       Subsystem 5 - Serial number: 00000000000000000
    
       Subsystem 6 - Serial number: 00000000000000000
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel (J527)       Labels:| 3C0-953-569.clb
       Part No SW: 3C9 953 501 BM    HW: 5K0 953 569 T
       Component: LENKS.MODUL   009 0136  
       Revision: FF010039    Serial number: 20101130301577
       Coding: 399AA50001
       Shop #: WSC 00015 115 00000
       ASAM Dataset: EV_VW360SteerWheelUDS A03004
       ROD: EV_VW360SteerWheelUDS.rod
       VCID: 75CF08BBD49942E2FE-8020
    
       Multifunction steering wheel control module: 
       Subsystem 1 - Part No SW: 3C8 959 537 D    HW: 3C8 959 537 D  Labels: 3C8-959-537.CLB
       Component: E221__MFL-TK6  H06 0022 
       Coding: E30000
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments (J285)       Labels:| 3C8-920-xxx-17.clb-SRI1
       Part No SW: 3AA 920 880 A    HW: 3AA 920 880 A
       Component: KOMBI         H02 0206  
       Serial number: 00000000000000
       Coding: 161F00
       Shop #: WSC 05314 115 12345
       ASAM Dataset: EV_Kombi_UDS_VDD_RM09 A04089
       ROD: EV_Kombi_UDS_VDD_RM09_004_VW32.rod
       VCID: 3147FCAB60712EC262-8064
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 18: Aux. Heat        Labels: 1K0-815-007.clb
       Part No: 7N0 963 272 A
       Component: Standheizer     043 4730  
       Revision: 00043000    Serial number: 09022127000000
       Coding: 0031032
       Shop #: WSC 05311 000 00000
       VCID: 334BF6A3526D1CD210-8066
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 19: CAN Gateway (J533)       Labels:. 7N0-907-530-V2.clb
       Part No SW: 7N0 907 530 G    HW: 1K0 907 951 
       Component: J533  Gateway H41 1614  
       Revision:   H41       Serial number: 091210F1003001
       Coding: 462006
       Shop #: WSC 05314 123 12345
       VCID: 3449F5BF97631BEA09-8060
    
    1 Fault Found:
    01517 - Control Module for Trailer/Towing Sensor (J345) 
                004 - No Signal/Communication
                 Freeze Frame:
                        Fault Status: 01100100
                        Fault Priority: 2
                        Fault Frequency: 1
                        Reset counter: 124
                        Mileage: 107270 km
                        Time Indication: 0
                        Date: 2013.12.11
                        Time: 05:06:29
    
    
    -------------------------------------------------------------------------------
    Address 20: High Beam Assist. (J844)       Labels:. 8K0-857-511.clb
       Part No SW: 5K0 857 511 B    HW: 8P0 857 511 C
       Component: FLA           H04 0006  
       Revision: AA001002    
       Coding: 01018E67727261565623393E00
       Shop #: WSC 05311 000 00000
       VCID: 2D7FE0DB74494A2246-8078
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 22: AWD        Labels: 0AY-907-554-V1.clb
       Part No SW: 0BS 907 554 B    HW: 0BS 907 554 B
       Component: Haldex 4Motion      4015  
       Coding: 0000005
       Shop #: WSC 00000 000 00000
       VCID: 45AFB87B0CF99262AE-8010
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 25: Immobilizer        Labels: 3C0-959-433-25.clb
       Part No SW: 3AA 959 799     HW: 3AA 959 799 
       Component:    IMMO         083 0399  
       Revision: 00083000    Serial number: VWZCZ000000000
       Shop #: WSC 131071 1023 2097151
       VCID: 052F787B4C795262EE-8050
    
       Subsystem 1 - Part No: 3C0 905 861 J
       Component:    ELV          029 0380
       3C0905861J     ELV          029 0380   
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 36: Seat Mem. Drvr (J810)       Labels: 3C0-959-760.lbl
       Part No SW: 3C8 959 760 A    HW: 3C8 959 760 A
       Component: Sitzmemory    H05 2201  
       Revision: 00H05000    
       Coding: 000039
       Shop #: WSC 00000 000 00000
       VCID: 334BF6A3926D1CD210-8066
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 37: Navigation (J0506)       Labels:. 1T0-035-680.clb
       Part No SW: 1T0 035 686 E    HW: 1T0 035 686 E
       Component: RNS-MID       H21 6270  
       Revision: AB001001    Serial number: VWZ6Z7N9312149
       Coding: 00050002010000800000
       Shop #: WSC 05314 123 12345
       VCID: 364DCFB7811F09FA37-8062
    
       Subsystem 1 - Part No: 1T0 919 859 B
       Component: EU West V16  8536 
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 42: Door Elect, Driver (J386)       Labels:| 3C0-959-70X-GEN4.clb
       Part No SW: 3AA 959 701 A    HW: 3C0 959 793 C
       Component: TUER-SG FT    002 0529  
       Revision: 12110009    Serial number: 0001828416
       Coding: 0211FF
       Shop #: WSC 05311 115 00000
       ASAM Dataset: EV_TSGFPQ35BRFVW46X A04001
       ROD: EV_TSGFPQ35BRFVW46X_VW32.rod
       VCID: 354FC8BB941902E23E-8060
    
       Slave Driver: 
       Subsystem 1 - Part No SW: 3AA 959 703     HW: 3C0 959 794 B  Labels: 1K0-959-70X-GEN4.CLB
       Component: J388__TSG-HL  004 0407 
       Serial number: 00000001741953      
       Coding: 0000D8
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 44: Steering Assist        Labels: 5N1-909-144.clb
       Part No SW: 5N1 909 144 L    HW: 5N1 909 148 G
       Component: J500__APA-BS KL.318 0802  
       Revision: 1AH03729    Serial number: 00103360113601
       Coding: 0000258
       Shop #: WSC 05311 000 00000
       VCID: 3B5BDE837A3DD492C8-806E
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv.        Labels:. 3C0-959-799-46.clb
       Part No SW: 3AA 959 799     HW: 3AA 959 799 
       Component: 02 KESSY PQ47   083 0323  
       Revision: 00083000    Serial number: VWZCZ000000000
       Coding: 01900A00D2C30E76300494157E00CFCE705801030424B8
       Shop #: WSC 05311 123 12345
       VCID: 052F787B4C795262EE-8050
    
       Subsystem 1 - Part No: 1K8 951 605 A
       Component: LIN BACKUP HORN H11 9004
    
       Subsystem 2 - Part No: 3C0 951 171 C
       Component: Neigungssensor  004 0611
    
       Subsystem 3 - Part No: 3C0 951 171 C
       Component: Innenraumueberw.004 0611
    
    1 Fault Found:
    01517 - Control Module for Trailer/Towing Sensor (J345) 
                004 - No Signal/Communication
                 Freeze Frame:
                        Fault Status: 01100100
                        Fault Priority: 4
                        Fault Frequency: 1
                        Reset counter: 124
                        Mileage: 107270 km
                        Time Indication: 0
                        Date: 2013.12.11
                        Time: 05:05:46
    
    
    -------------------------------------------------------------------------------
    Address 47: Sound System        Labels: 3C0-035-456.clb
       Part No SW: 3AA 035 456 A    HW: 3AA 035 456 A
       Component: DSP 10 Kanal        0020  
       Revision: 00H02001    Serial number: 75818000267704
       Shop #: WSC 00000 000 00000
       VCID: 2D7FE0DBB4494A2246-8078
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 4F: Centr. Electr. II (J520)       Labels:. 1K0-907-532.clb
       Part No SW: 7N0 907 532     HW: 1K0 907 951 
       Component: EZE_2         H41 1614  
       Revision:   H41       Serial number: 091210F1003001
       Coding: 050B0508
       Shop #: WSC 05314 123 12345
       VCID: 6FC33AD3BEC5783234-803A
    
       Subsystem 1 - Part No SW: 8R0 959 591 A    HW: 8R0 959 591 
       Component: J245EE20SKB13  H02 0220 
       Serial number: 0123456789ABCDEFGHIJ
    
       Subsystem 2 - Part No SW: 8R0 959 591 A    HW: 8R0 959 591 
       Component: J394EE20SKB13  H02 0220 
       Serial number: 0123456789ABCDEFGHIJ
    
       Subsystem 3 - Part No SW: 3AA 919 204     HW: 3AA 919 204 
       Component: Analoguhr  003 0003 
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 52: Door Elect, Pass. (J387)       Labels:| 3C0-959-70X-GEN4.clb
       Part No SW: 3AA 959 702 A    HW: 3C0 959 792 C
       Component: TUER-SG BT    002 0529  
       Revision: 14110009    Serial number: 0001832542
       Coding: 0211FE
       Shop #: WSC 05311 115 00000
       ASAM Dataset: EV_TSGBPQ35BRFVW46X A04001
       ROD: EV_TSGBPQ35BRFVW46X_VW46.rod
       VCID: 364DCFB7891F09FA37-8062
    
       Slave Passenger: 
       Subsystem 1 - Part No SW: 3AA 959 704     HW: 3C0 959 795 B  Labels: 1K0-959-70X-GEN4.CLB
       Component: J389__TSG-HR  004 0407 
       Serial number: 00000001755172      
       Coding: 0000D8
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 53: Parking Brake        Labels: 3AA-907-801.clb
       Part No SW: 3AA 907 801 E    HW: 3AA 907 801 E
       Component: J540 EPB4  VW-55183 0007  
       Revision:   H18       Serial number: 00000000077057
       Coding: 0022067
       Shop #: WSC 05311 000 00000
       VCID: 334BF6A3526D1CD210-8066
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 55: Headlight Range (J745)       Labels:. 5M0-907-357-V3.clb
       Part No SW: 5M0 907 357 F    HW: 7L6 907 357 C
       Component: AFS-ECU       H04 0111  
       Revision: --------    Serial number: --------------
       Coding: 02B2000003000200
       Shop #: WSC 05311 115 12345
       ASAM Dataset: EV_HeadlRegulVWAFSPt 002016
       ROD: EV_HeadlRegulVWAFSPt_VW46.rod
       VCID: 3753C2B38E15F0F22C-8062
    
       Subsystem 1 - Part No SW: 3D0 941 329 B    HW: 3D0 941 329 B  Labels: 3D0-941-329.CLB
       Component: LeiMo links  H04 0012 
       Coding: 230000
    
       Subsystem 2 - Part No SW: 3D0 941 329 B    HW: 3D0 941 329 B  Labels: 3D0-941-329.CLB
       Component: LeiMo rechts  H04 0012 
       Coding: 230000
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 56: Radio (J0506)       Labels:. 1T0-035-680.clb
       Part No SW: 1T0 035 686 E    HW: 1T0 035 686 E
       Component: RNS-MID       H21 6270  
       Revision: AB001001    Serial number: VWZ6Z7N9312149
       Coding: 00050002010000800000
       Shop #: WSC 05314 123 12345
       VCID: 364DCFB7811F09FA37-8062
    
       Subsystem 1 - Part No: 1T0 919 859 B
       Component: EU West V16  8536 
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 61: Battery Regul. (J840)       Labels:. 1K0-907-534.clb
       Part No SW: 7N0 907 534     HW: 1K0 907 951 
       Component: Batt.regelung H41 1614  
       Serial number: 091210F1003001
       Coding: 030B185A
       Shop #: WSC 05314 123 12345
       VCID: 71C73CABA8F16EC222-8024
    
       Subsystem 1 - Part No SW: 1K0 915 181 F    HW: 1K0 915 181 A
       Component: J367-BDM  H07 0150 
       Serial number: 00000000009370219854
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 65: Tire Pressure (J502)       Labels: 3AA-907-273.clb
       Part No SW: 3AA 907 273 F    HW: 5Q0 907 273 
       Component: RDKBERU30     H04 0011  
       Serial number: 30000000049734
       ASAM Dataset: EV_RDKBERU30 005005
       ROD: EV_RDKBERU30_005.rod
       VCID: 3753C2B38E15F0F22C-8062
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 69: Trailer
    Cannot be reached
    
    -------------------------------------------------------------------------------
    Address 6C: Back-up Cam.        Labels: 5N0-907-441.clb
       Part No SW: 3C9 907 441     HW: 3C9 907 441 
       Component: J772__Rearview      0020  
       Revision: 00H08000    Serial number: 525PA8-J0X1596
       Coding: 0020007
       Shop #: WSC 05311 000 00000
       VCID: 68F151CF5B2BAF0A75-803C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 6D: Trunk Elect.        Labels: 3C9-827-383.clb
       Part No SW: 3C9 827 383 J    HW: 3C9 827 383 J
       Component: J605  HECKDECKEL    0804  
       Revision: 00H27001    
       Shop #: WSC 05314 000 00000
       VCID: 3851C18F4B0BFF8A25-806C
    
       Subsystem 1 - Part No: 3C9 827 384 J
       Component: J756  HECKDECKEL    0804
    
       Subsystem 2 - Serial number: 1000H27001001B0090
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 77: Telephone (J412)       Labels:| 3C8-035-730-A.clb
       Part No SW: 3C8 035 730 D    HW: 3C8 035 730 D
       Component: Telefon       022 0946  
       Revision: --------    Serial number: 35502105030069
       Coding: 020000000100010000000001
       Shop #: WSC 12345 123 12345
       ASAM Dataset: EV_UHVPremi 002708
       ROD: EV_UHVPremi.rod
       VCID: 246905FF2F838B6A99-8070
    
    No fault code found.
    
    End-------------------------(Elapsed Time: 03:36)--------------------------
    I know some additional coding is required other than adding 69 - Trailer to the installation list, but since it cannot be reached anyway I have not done so yet.

    Is the control unit dead or is there something wrong with my wiring that I haven't discovered?

  2. #2
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    Quite simple really - xenon range is on the Extended CAN and the trailer detection is on the Convenience CAN. So you'll still have to make a new splice. If splicing near the CAN gateway on the Passat B7 is too much of a PITA (which I agree to), you can splice near the BCM (T52c/15 and T52c/16) - it's also on the Convenience CAN.
    Last edited by siLc; 07-21-2019 at 02:13 AM.

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  4. #3
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    Damn! Now that you mention it I seem to vaguely remember that I spliced onto CAN gateway T20e/16 and T20e/6 for the headlight range module. And looking at the instructions that came with the tow bar it says to splice onto T20e/15 and T20e/5. Very annoying mistake, but much better than having to buy a new control unit (which wouldn't have worked anyway ). Will let you know how it goes

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  6. #4
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    By the way, I now noticed you have the electric rear hatch. The left side control module for this is also on the Convenience CAN, incidentally on the same side as the trailer module. So you may be able to find a Convenience CAN twisted pair closer than you think to the trailer module. My B7 has the trailer module from the factory and I retrofitted the electric hatch splicing into the Convenience CAN near the trailer module. You may be able to do the opposite.

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  8. #5
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    Nice suggestion, but with the wires already pulled up by the front I ended up splicing onto BCM T52c/15 and T52c/16. Worked great and the control unit came to life. Hopefully no more issues when the trailer is connected. Thanks!

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