Touareg 7L6 auto headlights after rain sensor retrofit?

   #1  

Turik08

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Hi all,

My first post on this VCDS forum.... :) I have a Touareg 7L6, model year 2008.

I recently got a hit from a rock on my windshield and while replacing the windshield through insurance to the one with a factory-equipped rain sensor / auto-dimming mirror holder, I retrofitted the rain sensor according to the wiring schema available through VW's erWin online service. I have also swapped my original light switch with otherwise similar OEM original part with the addition of "Auto" position.

The rain sensor and wipers are working just as described in the owner's manual. However, the automatic headlight functionality is not.

Is it so that the automatic headlight functionality needs to be enabled via VCDS? I don't see any options related to it in the central electronics control module. I only see coming/leaving home, high beam with assistance driving light and garage/cinema light bits in the long coding section. What are those options for?

Byte 00 Bit 7 High Beam with Assistance Driving Light
...
Byte 04 Bit 0 Assistance Driving Light
Byte 04 Bit 1 Coming-Home
Byte 04 Bit 2 Garage/Cinema Light

I also tried to enable bit 1 Coming/leaving home in VCDS, and after that I can see the related options in the instrument cluster's MFD (off/10s/20s adjustment), but after setting some other value than "off", the headlights anyway remain inactive when the car is locked/unlocked.

Any advice on how to get automatic ("tunnel") headlights and CH/LH enabled?

I have tried CH/LH coding and activation when it should have been dark enough ambient light level outside (night time).

Please find the VCDS scan below.

-Turik08

Code:
Wednesday,12,July,2017,21:27:27:41242
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 17.1.3.0 (x64)
Data version: 20170320 DS267.7
www.Ross-Tech.com


VIN: WVGZZZ7LZ8D0XXXXX   License Plate: NNNNN
Mileage: XXXkm-YYYmi   Repair Order: 12_07_2017_DTC


Chassis Type: 7L (6N0)
Scan: 01 02 03 05 08 09 15 16 17 18 19 22 32 37 46 47 55 56 68 69
          6C 76 77

VIN: WVGZZZ7LZ8D0XXXXX   Mileage: XXXkm-YYYmiles

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: Malfunction 0010
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: Malfunction 0010
17-Instruments -- Status: Malfunction 0010
18-Aux. Heat -- Status: OK 0000
19-CAN Gateway -- Status: Malfunction 0010
22-AWD -- Status: OK 0000
32-Differential Locks -- Status: Malfunction 0010
37-Navigation -- Status: Malfunction 0010
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
47-Sound System -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
55-Headlight Range -- Status: Malfunction 0010
56-Radio -- Status: Malfunction 0010
62-Door, Rear Left -- Status: OK 0000
68-Wiper Electr. -- Status: Sporadic communication error 1000
69-Trailer -- Status: OK 0000
6C-Back-up Cam. -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
76-Park Assist -- Status: OK 0000
77-Telephone -- Status: Malfunction 0010
 
-------------------------------------------------------------------------------
Address 01: Engine (CAS)       Labels: 059-907-401-CAT1.clb
   Part No SW: 7L0 907 401 N    HW: 7L0 907 401 H
   Component: 3.0TDI EDC17G104AG  0040  
   Revision: --H02---    Serial number: VWX3Z0H1726703
   Coding: 04210023591F0968
   Shop #: WSC 39721 123 79935
   VCID: 36635AB442E667F103-5124

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

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 09D-927-750.lbl
   Part No SW: 09D 927 750 FT    HW: 09D 927 750 FT
   Component: AL 750 6A           1168  
   Revision: 00H75000    Serial number:               
   Coding: 0004456
   Shop #: WSC 31414 790 00001
   VCID: 0501ED784F803C69DA-5140

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 7L0-907-379-MK25E1.clb
   Part No SW: 7L0 907 379 L    HW: 7L0 907 379 L
   Component: ESP ALLRAD MK25E1   0303  
   Revision: 00H53001    
   Coding: 0004354
   Shop #: WSC 31414 790 00001
   VCID: 428B3664192ECB51BF-8016

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth.        Labels: 3D0-909-13x-05.lbl
   Part No SW: 3D0 909 139 B    HW: 5WK 485 04
   Component:    Kessy            6840  
   Revision: 68406620    Serial number: VWX3Z0H1726703
   Coding: 0000232
   Shop #: WSC 31414 790 00001
   VCID: 285F84CC9F52010181-807C

   Subsystem 1 - Part No: XXXXXXXXXXX 
   Component: ELV                 XXXX

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 7L6-907-040.clb
   Part No: 7L6 907 040 AF
   Component: CLIMAtronic R/L     4331  
   Coding: 0000020
   Shop #: WSC 31414 790 00001
   VCID: 74E7A0BC131A35E1FD-8020

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 7Lx-937-049-V2.clb
   Part No SW: 7L6 937 049 AF    HW: 7L6 937 049 AF
   Component: J519                2000  
   Revision: -0004---    Serial number: --------------
   Coding: 6000040038021C000000000000000000
   Shop #: WSC 31414 790 00001
   VCID: 000FFC6C57A21941E9-8054

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 7L0-959-655.lbl
   Part No SW: 7L0 959 655     HW: 7L0 959 655 
   Component: J234__37 VW8T       0250  
   Revision: 92012025    Serial number: 0039P0048ZTR  
   Coding: 0013111
   Shop #: WSC 31414 790 00001
   VCID: 7AFB8E84317E4391A7-802E

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 7L6-953-549.lbl
   Part No: 7L6 953 549 F
   Component: J527                3601  
   Coding: 0010011
   Shop #: WSC 31414 790 00001
   VCID: 428B3664192ECB51BF-8016

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 7L6-920-xxx-7L6.lbl
   Part No SW: 7L6 920 885 R    HW: 7L6 920 885 R
   Component: J285 KOMBI-INST.    7520  
   Revision: KHH06V02    
   Coding: 0005111
   Shop #: WSC 00011 888 96745
   VCID: 4B951B402A640A194C-801E

No fault code found.

-------------------------------------------------------------------------------
Address 18: Aux. Heat        Labels: 7L6-819-008.lbl
   Part No: 7L6 815 071 G
   Component: Standheizung E1MAC  0425  
   Coding: 0000000
   Shop #: WSC 31414 790 00001
   VCID: 36635AB441E667F103-8062

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels: 6N0-909-901-7L.clb
   Part No SW: 6N0 909 901     HW: 7L6 920 885 R
   Component: J533  GW-K-CAN TP20 7520  
   Coding: 77EAE7CBCA056002
   Shop #: WSC 00011 888 96745
   VCID: 70EFACAC630209C119-8024

No fault code found.

-------------------------------------------------------------------------------
Address 22: AWD        Labels: None
   Part No: 0AD 927 755 BG
   Component: TRANSFERCASE        0126  
   Shop #: WSC 00000 000 00000
   VCID: 0109F9685BA81049E6-5140

No fault code found.

-------------------------------------------------------------------------------
Address 32: Differential Locks        Labels: None
   Part No: 0AC 927 771 D
   Component: SG-Quersperre       5023  
   Shop #: WSC 00000 000 00000
   VCID: 3979518873F88889EE-5140

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation (J0506)       Labels: 1T0-035-680.clb
   Part No SW: 7L6 035 680 B    HW: 7L6 035 680 A
   Component: RNS-MID       H04 1102  
   Revision: AB001001    Serial number: VWZ6Z7H9056135
   Coding: 000100400100002200
   Shop #: WSC 39713 123 79375
   VCID: 316969A8688840C956-8064

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels: 7L0-959-933.lbl
   Part No: 7L6 959 933 A
   Component: 4N HSG              0601  
   Coding: 0000069
   Shop #: WSC 38550 001 1048576
   VCID: 408F3C6C1022D941A9-4B00

   Subsystem 1 - Part No: 7L0 959 701 N
   Component: Tuersteuergeraet FS 6303

   Subsystem 2 - Part No: 7L0 959 702 N
   Component: Tuersteuergeraet BF 6302

   Subsystem 3 - Part No: 7L6 959 703 
   Component: Tuersteuergeraet HL 0202

   Subsystem 4 - Part No: 7L6 959 704 
   Component: Tuersteuergeraet HR 0202

No fault code found.

-------------------------------------------------------------------------------
Address 47: Sound System        Labels: 7Lx-035-4xx-47.lbl
   Part No SW: 7L6 035 456 C    HW: 7L6 035 456 C
   Component: 08K Audioverst.     0001  
   Revision: 00001000    Serial number: 00000000170951
   Shop #: WSC 00000 000 00000
   VCID: 336563A0529472D924-8066

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 7L6-907-357-A.lbl
   Part No SW: 7L6 907 357 A    HW: 7L6 907 357 A
   Component: AFS-Steuergeraet    0001  
   Revision:   H02       Serial number:               
   Coding: 1286275
   Shop #: WSC 00136 935 101092
   VCID: 3979518874F88889EE-806C

   Subsystem 1 - Part No: 7L6 941 329 B  Labels: 3D0-941-329.CLB
   Component: AFS-Lst.-Modul l    0004  
   Coding: 00000019

   Subsystem 2 - Part No: 7L6 941 329 B  Labels: 3D0-941-329.CLB
   Component: AFS-Lst.-Modul r    0004  
   Coding: 00000019

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio (J0506)       Labels: 1T0-035-680.clb
   Part No SW: 7L6 035 680 B    HW: 7L6 035 680 A
   Component: RNS-MID       H04 1102  
   Revision: AB001001    Serial number: VWZ6Z7H9056135
   Coding: 000100400100002200
   Shop #: WSC 39713 123 79375
   VCID: 316969A8688840C956-8064

No fault code found.

-------------------------------------------------------------------------------
Address 68: Wiper Electr.        Labels: 7L0-955-119-V2.clb
   Part No: 7L6 955 119 B
   Component: J400__ Front Wiper  5301  
   Coding: 0001392
   Shop #: WSC 31414 790 00001
   VCID: 3979518870F88889EE-806C

   Subsystem 2 - Part No: 1K0 955 559 AH  Labels: 1K0-955-559-AG.CLB
   Component: RLS     141111 054  0403  
   Coding: 00209069
   Shop #: WSC 31414  

No fault code found.

-------------------------------------------------------------------------------
Address 69: Trailer        Labels: 7L0-907-383-1D2.lbl
   Part No SW: 7L0 907 383 L    HW: 7L0 907 383 L
   Component: J345  Anhaenger     0080  
   Revision: 4A014001    Serial number: 00000109595999
   Coding: 0000001
   Shop #: WSC 00000 000 00000
   VCID: 3D71459860D0B4A9C2-8068

No fault code found.

-------------------------------------------------------------------------------
Address 6C: Back-up Cam.
Cannot be reached

-------------------------------------------------------------------------------
Address 76: Park Assist        Labels: Redir Fail!
   Part No: 7L0 919 283 F
   Component: 0E Einparkhilfe     1107  
   Shop #: WSC 00000 000 00000
   VCID: 3979518874F88889EE-806C

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone        Labels: 3C0-035-730.lbl
   Part No SW: 7L6 035 730 C    HW: 7L6 035 730 
   Component: Telefon             1910  
   Revision: 00011000    Serial number: 0000000061562
   Coding: 0020041
   Shop #: WSC 31414 790 00001
   VCID: 2E5372D4B9B65F314B-807A

No fault code found.

End-------------------------(Elapsed Time: 04:18)--------------------------
 
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   #2  

Turik08

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Are there measuring blocks for checking if I'm getting sensible ambient light level readings from the rain/light sensor on the Touareg 7L6? If yes, where should they be located?
 
   #3  

iichel

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I'm just having a quick look at your RLS coding in subsystem 68. The coding is currently 00206069 in decimal, in HEX thats 0071A8. RLS coding for my RLS has byte 00 coded as 07.
0771A8 HEX would make 00487848 in decimal (I'm guess here, please check the label)
 
   #4  

Turik08

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Hi iichel,

Thanks, I will check my RLS coding this evening against what you have provided.

Do you have any option in the long coding for Central electrics control module visible in VCDS? Or is everything behind the RLS, also functions related to light sensor / auto headlights? My VCDS doesn't show any tick boxes / bits related to RLS in the CECM.
 
   #5  

iichel

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I have a lot of functions visible in VCDS, however I have a VW Polo and not a Touareg.
You might wanna have a look in module 46 as well. I don't know how much is done in 09 and how much in 46.
 
   #6  

Turik08

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Ok, I managed to get it working. In case someone else is going for this retrofit, here's the info.

First of all, enabling "Byte 04 Bit 0 Assistance Driving Light" in CECM seemed to do the trick. Headlights get switched off in daylight when the light switch is in "Auto" position. Likewise, headlights get switched on when driving into a tunnel.

RLS readings are available behind "55 - Headlight range control unit" for the Touareg 7L6.

Code:
                Address 55: Headlight Range  (7L6 907 357 A)

23:16:53 Group 008
  0  Helligkeit Lichtsensor
  OK  Status Regensensor
  OK  Status Lichtsensor
  OK

The brightness reading ("Hellingkeit Lichtsensor") will adjust when I e.g. point a flashlight into the sensor in darkness.

However, I would like to decrease the sensitivity a bit because right now, the headlights get switched on when I start my car in the morning, and there is a shadow that is cast right at my parking slot... When I back off, then the headlights turn off. This causes one extra unnecessary on-off cycle for my Xenons. Any ideas how the sensitivity threshold could be decreased slightly? I suppose I could play with the byte 1 value in RLS a little, but any recommended value for the Touareg?

Current coding of RLS:

Code:
Address 68: Wiper Electr.        Labels: 7L0-955-119-V2.clb
   Part No: 7L6 955 119 B
   Component: J400__ Front Wiper  5301  
   Coding: 0001392
   Shop #: WSC 31414 790 00001
   VCID: 3979518870F8888E8D-806C

   Subsystem 2 - Part No: 1K0 955 559 AH  Labels: 1K0-955-559-AG.CLB
   Component: RLS     141111 054  0403  
   Coding: 00471085
   Shop #: WSC 31414  

No fault code found.
 
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