Headlight swap: Twin halogen to bi-xenon - Do I need new CECM/BCM?

   #1  

bjornix

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I'm not sure if this is the appropriate place for this question, but with the level of knowledge on this forum I'll give it a shot. I'm swapping the twin halogen headlights for a pair of bi-xenons (part no. 3AB 941 751 and 3AB 941 752) on a Passat B7 (European). I've read many tutorials, but there is one thing I cannot figure out: How can I verify if I need a new CECM/BCM module or not? Is it determined by part number/version (mid-line, high-line etc.), software version or something else? Mine is part no. 3AA 937 087 A, I'm pretty sure that's a high-line CECM/BCM.

Code:
Wednesday,14,June,2017,16:14:24:22644
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 8.1 x86
VCDS Version: 17.1.3.0
Data version: 20170320 DS267.7
www.Ross-Tech.com


VIN: WVWZZZ3CZBE325045   License Plate: 
Mileage: 64630km-40159mi   Repair Order: 



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


Chassis Type: 3C (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 56 61 62 65 6C 6D 72 77

VIN: WVWZZZ3CZBE325045   Mileage: 64630km-40159miles

01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
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: Malfunction 0010
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
56-Radio -- Status: OK 0000
61-Battery Regul. -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
65-Tire Pressure -- 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: 77D302B3CE9530F9D8-8022

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: 1B1B3E03DAFDB4991C-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 V5A0 0011  
   Revision: --H07---    Serial number: 00000003272703
   Coding: 0121279
   Shop #: WSC 05311 000 00000
   VCID: 3A55DB877507ED91E7-806E

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels: 5K0-907-044.clb
   Part No SW: 5K0 907 044 EC    HW: 5K0 907 044 EC
   Component: Climatronic   H17 1010  
   Revision: 00003001    
   Coding: 0000000003
   Shop #: WSC 00015 115 00000
   ASAM Dataset: EV_Climatronic A01010
   ROD: EV_ClimaAutoBasis_VW36.rod
   VCID: 70C139AFABFB67C119-8024

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: 0002000000000000001C0088740081E443510088476DA5606480C7200041
   Shop #: WSC 05311 000 00000
   VCID: 3851C18F8B0BFF8111-806C

   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

No fault code found.

-------------------------------------------------------------------------------
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 1023 2097151
   ASAM Dataset: EV_EPHVA2C000000000 001006
   ROD: EV_EPHVA2C000000000_SK46.rod
   VCID: 3C59DD9FB733D3A1F5-8068

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: 77D302B3069530F9D8-8022

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: 277312F356B5607988-8072

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: 4CB98D5F2F93632145-8018

   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: 75CF08BBD49942E9CA-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
   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 00000
   ASAM Dataset: EV_Kombi_UDS_VDD_RM09 A04089
   ROD: EV_Kombi_UDS_VDD_RM09_004_VW25.rod
   VCID: 3147FCAB60712EC956-8064

1 Fault Found:
12658432 - Function Restricted due to Missing Message(s) 
          U1111 00 [009] - -
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 156
                    Mileage: 64609 km
                    Date: 2017.06.12
                    Time: 21:19:41


-------------------------------------------------------------------------------
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: 334BF6A3526D1CD924-8066

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 000 00000
   VCID: 3449F5BF97631BE13D-8060

1 Fault Found:
01325 - Control Module for Tire Pressure Monitoring (J502) 
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 156
                    Mileage: 64609 km
                    Time Indication: 0
                    Date: 2011.11.03
                    Time: 21:16:12


-------------------------------------------------------------------------------
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: 2D7FE0DB74494A2972-8078

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: 45AFB87B0CF992699A-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: 052F787B4C795269DA-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: 334BF6A3926D1CD924-8066

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation (J0506)       Labels: 1T0-035-680.clb
   Part No SW: 1T0 035 680 C    HW: 1T0 035 680 C
   Component: RNS-MID       H42 2720  
   Revision: AB001001    Serial number: VWZ6Z7K4340126
   Coding: 04050002010000A000
   Shop #: WSC 05314 000 00000
   VCID: 2E7DE7D7794F31314B-807A

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.rod
   VCID: 354FC8BB941902E90A-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: 3B5BDE837A3DD499FC-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 000 00000
   VCID: 052F787B4C795269DA-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:
00955 - Key 1 
            005 - No or Incorrect Basic Setting / Adaptation
             Freeze Frame:
                    Fault Status: 01100101
                    Fault Priority: 4
                    Fault Frequency: 46
                    Reset counter: 157
                    Mileage: 64616 km
                    Time Indication: 0
                    Date: 2011.11.04
                    Time: 08:11:34


-------------------------------------------------------------------------------
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: 2D7FE0DBB4494A2972-8078

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 000 00000
   VCID: 6FC33AD3BEC5783900-803A

   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.rod
   VCID: 364DCFB7891F09F103-8062

   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: 334BF6A3526D1CD924-8066

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio (J0506)       Labels: 1T0-035-680.clb
   Part No SW: 1T0 035 680 C    HW: 1T0 035 680 C
   Component: RNS-MID       H42 2720  
   Revision: AB001001    Serial number: VWZ6Z7K4340126
   Coding: 04050002010000A000
   Shop #: WSC 05314 000 00000
   VCID: 2E7DE7D7794F31314B-807A

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 000 00000
   VCID: 71C73CABA8F16EC916-8024

   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
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: 68F151CF5B2BAF0141-803C

No fault code found.

-------------------------------------------------------------------------------
Address 6D: Trunk Elect.        Labels: None
   Part No SW: 3C9 827 383 J    HW: 3C9 827 383 J
   Component: J605  HECKDECKEL    0804  
   Revision: 00H27001    
   Shop #: WSC 05314 000 00000
   VCID: 3851C18F4B0BFF8111-806C

   Subsystem 1 - Part No: 3C9 827 384 J
   Component: J756  HECKDECKEL    0804

   Subsystem 2 - Serial number: 1000H27001001B0090ÿ

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone (J412)       Labels: 3C8-035-730-A.clb
   Part No SW: 5N0 035 730 D    HW: 5N0 035 730 D
   Component: Telefon       009 0511  
   Revision: --------    Serial number: 35909603083200
   Coding: 020100000000000000010000
   Shop #: WSC 00015 115 00000
   ASAM Dataset: EV_UHVPremi A01005
   ROD: EV_UHVPremi_A01.rod
   VCID: 297714CB48A156099E-807C

No fault code found.

End-------------------------(Elapsed Time: 03:30)--------------------------
 
   #2  

m87a

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you have a highline bcm so there is no need to replace it, you just need to code bi xenon and byte 18, since it's masked with 00 (you don't know real value) you will have to play a little to get everything to work 100%
for byte 18 try 65 in 70% of passats B7 it works ;)
 
   #3  

bjornix

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Yes, I have heard stories about byte 18 :p Thanks for confirming that a replacement is not necessary and for the coding tip, I really appreciate it! :)
 
   #4  

bjornix

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I received the wiring harness for retrofitting bi-xenon headlights yesterday and that raised a couple of qustions...

1) I did a continuity test on all connectors and from that, and some wiring diagrams found on other forums, I was able to figure out where to connect all the wires. However, I did find something that did not seem right; The 10 pin headlight connector from the car connects to the 14 pin headlight connector on the xenons with adapters on the harness (one adapter for each headlight). According to wiring diagrams I have found from a newer Golf and Touran it seems pin 4 (DRL) on the 10 pin connector should connect to pin 12 on the 14 pin connector, but on my harness it is pin 8 on the 10 pin connector that connects to pin 12 on the 14 pin connector. Is there a difference between Golf/Touran and Passat so pin 8 is actually correct or should I change the harness so pin 4 connects to pin 12 instead?

2) My car has the DCC with electronically controlled damping and it uses a different leveling sensor than cars without this system. The 4 pin connector on the sensor I have is ever so slightly different so the connector on the harness will not fit, but with some careful grinding down I think this can be solved. I just wanted to ask if the pin-out is still the same? Pin 1 -> AFS T26/11, pin 2 -> AFS T26/10, pin 4 -> AFS T26/7.

3) I have not found a definite answer for how to power the headlights and AFS module and which fuse slots to use for this. In my head the headlights should be connected to constant +12V and the AFS control module should be connected to ACC, but I have also seen others connecting everything to ACC. Some use fuse slots 5 and 6, some use slots 14 and 15 - neither of these are vacant on my car. Slots 3, 8, 11, 17, 19, 20, 21 does not have fuses.
 
   #5  

m87a

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1. No, leave it as is. Check on your car, but i'm 99% sure your passat b7 doesn't have pin 4 for drl, when you code bi xenon your existing pin 8 will become DRL
2. i can't remember, but I think that dcc sends data to afs, check wiring in elsawin
3. You can use existing fused wire from 10 pin halogen connector, pin1 is +12V from SC1, so no need to add another fuse
 
   #6  

bjornix

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Thanks m87a for coming to my rescue once again. I am both more enlightened and still a little confused.

1. I will leave pin 8 as it is.

2. I am starting to wonder if I may have overestimated the work necessary for this retrofit. I looked under the car today by the rear left wheel and I can see that there is a sensor installed that looks very similar to the leveling sensor I got for the xenon headlights. Does the xenon headlights use the same leveling sensor as the DCC system? This page seems to suggest just that: https://www.drive2.com/l/10174458/ (admittedly a Yeti, not a Passat)

Also, my current halogen headlights are stationary, but my fog lights are bending at slow speed. Does this mean that I already have the AFS system installed? In that case will the AFS control unit be located behind the glove box?

If both of the above is true (fingers crossed) then I guess I only need to install the halogen to xenon adapters and connect to CECM pins 48 and 49?

3. I do like the idea of getting power from the existing 10 pin connector, but why isn't the adapter made to do just that in the first place? I see that others that do this retrofit is adding extra fuses, why would they if it isn't necessary? Do you happen to know which pin that is ground as well?
 
   #7  

m87a

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yes, sensors are the same, only difference is in rear sensor between fwd and awd (4motion has different sensor), i don't know maybe you'll have to splice in the sensor and also connect to afs module, check that
No, halogen headlights don't have AFS, corner lights (currently your fog lights bending at low speed are turned on by bcm, which receives information from steering wheel module, steering wheel angle and bcm turns on light)
pin1 is +12v, pin3 is ground, pin2 is signal from potentiometer (this one gets unused, not required any more), i don't know why they get left out, but i have always used pin 1 & 3 when doing afs retrofit
 
   #8  

bjornix

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Ok, so no AFS currently installed so I will still have to do that. Should I add a separate fuse for AFS? 5A/10A ACC? I will be modifying the xenon adapter to use pins 1 and 3 from existing halogen connector for power.

Now, about the xenon leveling sensor... ETKA lists this as partno 3C0 941 309 B (DCC + 4M). So today I crawled under the car to have a look at the sensor currently installed and what do you know - it is partno 3C0 941 309 B! I then released and dismantled the connector and found that pin 1 is brown wire, pin 2 is black wire and pin 3 is blue wire. The flow diagram I had downloaded from erWin confirmed this. I think I will follow your advise and splice into those wires, but rather than doing it by the sensor I will do it at the point where they enter the cabin. From underneath the car that appears to be somewhere near the base of the rear left wheel arch.

My concern now is that on my car pin 4 on the sensor was vacant, but on various retrofit guides I have found it is pin 3 that is vacant. This is probably due to the different sensor for DCC/4M as you mentioned, but how can I then know which wire goes where on the AFS? Is it just pins 3 and 4 that are swapped or have all three wires switched places?
 
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bjornix

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Now I found this thread and it suddenly became clear what you meant when you were saying "i can't remember, but I think that dcc sends data to afs, check wiring in elsawin". In other words, if DCC is installed then you can instruct the AFS to get the signals from the CAN bus instead of wiring it directly to the leveling sensor. Is this correct or am I making faulty assumptions again? :p
 
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for the fuse for afs you need to add or splice in one existing, meaning add one for AFS ;)
yep thats the thing with DCC and AFS, i would connect everything except sensor and test with coding to see if you really need to connect sensor to AFS, i'm 90% sure that you don't, but if you do need to you can do it inside the car where cable enters from wheel well
 
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bjornix

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This weekend I finally got around to start this retrofit. Everything from getting the cables through the firewall (used grommet behind battery box) to adding new fuses and splicing into the CAN hi/low aaaall the way up there by the gateway was a f*cking PITA. Not complicated, just takes some time. I am sure there are better and faster ways to do this than what I did. I think the original location of the AFS headlight range module is behind the glove box, but I found it more convenient to place it behind the hood release lever panel. The missis asked me kindly not to put the car out of service for the next week so I will wait a few days to swap the headlights (in case of byte 18 issues etc.). Of course, I still have some questions :p

1. Is it pins 48 and 49 on the golden CECM connector that controls the high beam shutters for Passat B7 as well? I ask because on my car those places are already occupied...?? Am I then supposed to splice into those wires? If yes, is there somewhere more accessible besides by the CECM I can find those wires?

2. The installation of the AFS headlight range module is complete with power (ACC), ground and CAN hi/low. There are also two wires going to each headlight adapter, but as mentioned I still have the halogen lamps so the adapter does not currently connect to anything. There are no wires going to the rear left leveling sensor, I rely on this information to come from the CAN bus. Will the AFS module accept a valid coding even if the car does not have the xenon lamps installed yet? If yes, then I can spend some time getting the coding for this module correct now so that is already taken care of.
 
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m87a

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1. yes, and yes there is, when you remove your bumper, next to your fog light, yor current DRL bulb (when you code byte 18 this bulb will become high beam since it's connected to pins 48 & 49, you can leave it connected as is and leave bulb and use plus from it to power high beam solenoid to pin11, I have done this to a friend and he later replaced this bulb with led so when he uses high beams this bulb also lights up, like dual high beam, he also put led in fog light so pretty cool in the end)
2. NO, won't allow to code since it's missing communication with headlights, when you code AFS module it automatically code each headlight
 
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Very good to know, thanks! Although, it could be that I will try to splice into pins 48 and 49 by the CECM after all (since the wiring is already fed into the cabin). The reason I hesitated is that there is limited space for soldiering and heat shrinking and I'm not a big fan of traditional wire taps (for reasons described here), but today I managed to find the only place in the country that sells Posi-Tap and although the principle is still the same it seems like a much better alternative. Comes highly recommended by some reputable auto shops.

I will not try to code the AFS just yet then. Will wait until the xenon headlights have been installed. I just saw this thread and it seems his setup is close to mine: 2011 Passat B7 (EU). Maybe I should use his final coding string as a basis for the CECM coding? Will post an update after I put the headlights in this weekend.
 
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don't use his final coding string, thats a bad approach, always use original coding string and compare with his to achieve results.
also try this
Byte 14 check bit 3 Bi-xenon headlights (with shutters) installed
Byte 15 check bit 3 Daytime running lights (DRLs) inactive with turn signals
Byte 15 check bit 6 Daytime running lights (DRL) via separate lights active (This could already be checked)
Byte 17 check bit 2 Bi-xenon with additional high beams
Byte 18 (This is the light config and once you change there is no going back if it was 00 since this is just a mask, and use dropdown list in your case try 65, also off topic C2 is new value for ROW Caddy 2016 (bi xenon 25W led drl )not in drop down list)
Byte 25 check bit 7
Byte 25 check bit 2 High beams with shutters active/installed
 
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bjornix

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Thanks! Will follow your instructions and let you know how it goes. Hopefully there are no major issues and that I can also get the AFS to accept leveling signals from CAN bus instead of directly from sensor :)
 
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I have to ask, did you buy a ready made wiring or did you do it yourself? I haven't read the complete thread, sorry.

The sensor information is normal dc voltage that is going to range control module, it is NOT connected to CAN gateway. So unless you have wires going from the control module to rear sensor, it ain't gonna work.

Also for the high beam shutter, I don't think you need to splice anything. The same pins, if I remember correctly, are used to light high beams in twin halogen setup. So if you have an adapter at the headlight side, that should already pass-through the correct information.

And may I ask why you didn't put the control module to the designated location behind the glovebox? It's a pefect place for it as there's already a spot for it with all the pre made holes and everything. Now when you sell the car and the next person needs to do something with the lights, unless you document everything you've done very carefully, they will never be able to even find the module.
That's why OEM route is good as it then follows the manufacturer spec on installation and wiring.
 
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I have to ask, did you buy a ready made wiring or did you do it yourself? I haven't read the complete thread, sorry.
I bought the wiring harness complete and have made some slight modifications to it (read thread for details).

The sensor information is normal dc voltage that is going to range control module, it is NOT connected to CAN gateway. So unless you have wires going from the control module to rear sensor, it ain't gonna work.
Are you sure about that? In controller 55, byte 1, bit 3 the label text is "Leveling Information via Sensor(s) and NOT via CAN". Also, this thread seems to point in the direction that leveling information can be obtained via CAN. It could be that you need to have the DCC system installed for that to work, which I have. Then the sensor is sending signals to the DCC controller (as voltage) and the controller is broadcasting on CAN bus.

Also for the high beam shutter, I don't think you need to splice anything. The same pins, if I remember correctly, are used to light high beams in twin halogen setup. So if you have an adapter at the headlight side, that should already pass-through the correct information.
That's interesting. I would gladly avoid splicing anything if that's an option. One thing though; if pins 48 and 49 are in use both for halogen and xenon, wouldn't those places be occupied on all Passat B7's? On most retrofit guides I have seen they are vacant. How sure are you about this?

And may I ask why you didn't put the control module to the designated location behind the glovebox? It's a pefect place for it as there's already a spot for it with all the pre made holes and everything. Now when you sell the car and the next person needs to do something with the lights, unless you document everything you've done very carefully, they will never be able to even find the module.
That's why OEM route is good as it then follows the manufacturer spec on installation and wiring.
I don't disagree with you on this, I just didn't bother with the extra hassle.
 
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To be honest B7 is not that familiar to me, I've more familiar with PQ35 cars.

I'll check from ELSA what it says about the sensor and about the BCM shutter pins. I'll reply back here.

Edit :

Ok, according to ELSA G76 is connected to J431 which is the headlight range control unit. However, it seems that with Dynamic chassis control it is already having that sensor and it's connected to DCC control box. So probably what you wrote that checking that bit in module 55 will use the data from DCC unit through CAN instead of direct connection to module 55 is correct and you don't need to wire the G76 again to J431.

What comes to the dip screen motor. In Elsa it says this :

Left gas discharge headlight unit :
V294, connector T14d/6 = Left dip beam screen motor is connected => BCM, T52a/11
V318 connector T14d/11 = Left dynamic cornering light control motor which is connected to BCM T52c/48

Right gas discharge headlight unit :
V295, connector T14e/6 = Right dip beam screen motor which is connected => BCM, T52c/52
V319, connector T14e/11 = Right dynamic cornering light control motor which is connected to BCM T52c/49
 
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bjornix

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Ok, according to ELSA G76 is connected to J431 which is the headlight range control unit. However, it seems that with Dynamic chassis control it is already having that sensor and it's connected to DCC control box. So probably what you wrote that checking that bit in module 55 will use the data from DCC unit through CAN instead of direct connection to module 55 is correct and you don't need to wire the G76 again to J431.
Yes, that is my impression too. Thank you for checking!

What comes to the dip screen motor. In Elsa it says this :

Left gas discharge headlight unit :
V294, connector T14d/6 = Left dip beam screen motor is connected => BCM, T52a/11
V318 connector T14d/11 = Left dynamic cornering light control motor which is connected to BCM T52c/48

Right gas discharge headlight unit :
V295, connector T14e/6 = Right dip beam screen motor which is connected => BCM, T52c/52
V319, connector T14e/11 = Right dynamic cornering light control motor which is connected to BCM T52c/49
Yes, the adapter uses pin(s) 6 on the existing 10 pin halogen harness for T14d/6 and T14e/6 so no issues there. What was discussed in this thread was where to get T14d/11 and T14e/11 and that would be either by splicing into CECM T52c/48+49 or (as suggested by m87a) by splicing into the power wire for the DRL bulb next to the fog light. Either way, it looks like some splicing is involved.
 
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Yes, the adapter uses pin(s) 6 on the existing 10 pin halogen harness for T14d/6 and T14e/6 so no issues there. What was discussed in this thread was where to get T14d/11 and T14e/11 and that would be either by splicing into CECM T52c/48+49 or (as suggested by m87a) by splicing into the power wire for the DRL bulb next to the fog light. Either way, it looks like some splicing is involved.
Sorry, now I don't understand? According to ELSA pin 6 on the headlight side is the shutter control for the Bixenon and those should be connected to T52a/11 and T52c/52 on the BCM side. pin 11 on the headlight is the cornering light (bend light) control motor connector.

But if m87a has done it like that then there's an error in ELSA.

I did not look what are connected to 48 and 49 in halogen setup. I think I should look that as well if it reveals something new :)
 
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