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      TIPS & FEATURES AEuro-Forum - READ!!   10/25/2016

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Matt Conner

Adaptive Headlights (AFS) INOP

13 posts in this topic

VIN: WAUEV74F57N024643
Production Month / Vehicle Year: July / 2006
Make: Audi
Model: A6 Quattro
Engine: 4.2L V8 #BVJ
Transmission: Automatic 6-Speed ZF
Mileage: 110865
Affected System: Electrical / Electronic Lighting / Interior / Exterior Xenon adaptive headlight
Description of Issue: INOP / Intermittent
Scan Tool: VCDS / Vag-Com
Related Repair History: REPLACE BOTH HEADLIGHT ASSEMBLIES WITH NEW/OEM/HELLA. Performed aim/alignment basic-setting.
Diagnostics / Tests Performed:

This is a little bit of a saga.  So, here is some background: 

Original complaint was "adaptive lighting malfunction" warning message.  Retrieved fault code (AW 55 "headlight range") back in January:

1 Fault Found:
02627 - Dynamic Cornering Light Motor; Left (V318) 
            010 - Open or Short to Plus - MIL ON

             Freeze Frame:
                    Fault Status: 11101010
                    Fault Priority: 2
                    Fault Frequency: 11
                    Reset counter: 223
                    Mileage: 173352 km
                    Time Indication: 0
                    Date: 2017.01.09
                    Time: 17:34:15

Diagnosed this malfunction as due to deteriorating wiring inside the headlight assembly.  

Few weeks later and the owner opted {requested} to replace BOTH head light assemblies due to
imperfections/age/life-expectancy/etc....  

~January 30th: They were swapped/replaced with OEM/Hella headlight assemblies. transferred xenon bulbs, igniter-modules,
and headlight control units to new assemblies.  Part # used: 4f0941030cs  and 4f0941029cs

Aimed head lights using VCDS AW55 basic-setting procedure. all OK.  ....some weeks after that the owner complains that the
cornering-range of the headlights appears to be "... more be limited than before the replacement"....no faults in the system can be found......several weeks after that he says there was another warning message (once/twice?) and the adaptive-corning lights "
....do not appear to be functioning at all...or are intermittently operational, with limited corning range still...".  

Recover one new fault: 

02629 - Sensor for Swivel Module Position; Left 
            008 - Implausible Signal - Intermittent

             Freeze Frame:
                    Fault Status: 00101000
                    Fault Priority: 2
                    Fault Frequency: 2
                    Reset counter: 200
                    Mileage: 177928 km
                    Time Indication: 0
                    Date: 2017.04.06       

CLEARED that Fault code and it has not yet returned during three additional scans/visits this
month (we are apparently on his morning commute route).

So here we are.  There are NO current faults to be found in AW55.  And short of replacing the headlight
assemblies again (with a confirmed newer version; part # 4F0 941 030EK  and  4F0 941 029EK), which I
am a bit hesitant to do, I am at a loss of ideas.

ONE THING, I can say that doe appear to be out-of-order:  WHen using AW55 output-test commands all the
adaptive-headlight swivel-motor operations appear to be fully functional, EXCEPT when commanding them to
"Steering-angle sensor dependent sweeping". In which case the both go FULL RIGHT and will not sweep even
when turning the steering wheel to full-lock left.      This seems like a pretty big clue to me, but I'm not sure where to go with it.  ??   

Confirmed the steering angle sensor input in AW55 MVBs and is good & calibrated/centered.

Attempted Re-coding AW55 to no effect.

Any thoughts or insight appreciated.  

***Will post a current auto-scan report AFTER I finish replacing the faulty/damaged Shifter-assembly mechanism (yes, same car)***         

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Maybe a basic setting or adaptation in AW 01 for the neutral safety switch AFTER you replace the shifter  
IF the car has DSG / Mechatronix 

The headlight sweeping may be speed dependent   .... sometimes there is a threshold to be exceeded before sweep
function works ... which may tie into   shifter   implausibility signal / condition 

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14 hours ago, Mike Webb said:

Maybe a basic setting or adaptation in AW 01 for the neutral safety switch AFTER you replace the shifter  
IF the car has DSG / Mechatronix 

The headlight sweeping may be speed dependent   .... sometimes there is a threshold to be exceeded before sweep
function works ... which may tie into   shifter   implausibility signal / condition 

Thanks, Mike. 

The shifter broke mechanically (internally in the gear-selector position-latching mechanism) and was stuck 
in neutral/drive gear positions.

Totally unrelated to the AHL malfunction, as far as I can tell.  
Other than the fact that the vehicle is/was not currently derivable (no {easy} way to shift into reverse or park).

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Posted (edited)

New shifter assembly installed.  

Our shop owner drove this vehicle home last night. 

reported back:  Adaptive head lights working. speed dependent, as they should be    Nothing abnormal.   

Going to have to get together with the owner again and find out more. stay tuned

Edited by Mike Webb
be

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Sometimes, it would be helpful to have the full strategy of the operating conditions / protocol,  of how things on the network interact.
Which is why the code setting criteria in generic in Elsa/repair/engine is great to have sometimes  

That does not apply to this though

We just have to give it our best guess .... more coconut oil is required

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Roger that, Mike.

Vehicle is back with the owner for now.    
We are claiming SNAFU until the system gives us some faults to work with.   

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Vehicle is back today.

Active warning message "adaptive light defective"

Stored fault code in AW55-headlight range:

Friday,28,April,2017,09:44:34:36887
VCDS Version: Release 17.1.3 (x64) Running on Windows 10 x64
www.Ross-Tech.com

Address 55: Headlight Range       Labels: 4F0-910-357.lbl
Control Module Part Number: 4F0 910 357 F    HW: 4F0 907 357 F
  Component and/or Version: AFS 1           H01 0020
           Software Coding: 0000016
            Work Shop Code: WSC 02325 785 00200
           Additional Info: 4F0941329B  AFS-Modul links H02 0020   4F0941329B  AFS-Modul rechtsH02 0020   
                      VCID: 29593B15806935099E-807C
1 Fault Found:

02629 - Sensor for Swivel Module Position; Left 
            008 - Implausible Signal - MIL ON

             Freeze Frame:
                    Fault Status: 11101000
                    Fault Priority: 2
                    Fault Frequency: 32
                    Reset counter: 204
                    Mileage: 178616 km
                    Time Indication: 0
                    Date: 2017.04.25
                    Time: 18:35:37

 

We have the "newer" headlight assemblies on standby.  

Though I am now suspecting a calibration discrepancy between the new headlight
assembly and the Adaptive-Range module/s  

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Posted (edited)

Can I get an ADMIN to UNLOCK this POST for further discussion? 

AW55 MVB007.jpg

The fault code (02629) will NOT clear.   

AND

Selective OUTPUT TESTS are now failing with a message, attached screen shot.

AW55 output test FAILURE.jpg

Edited by Matt Conner

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Unlocked there Matt.  Sorry, been out getting drained by Doctor.........
or maybe his fine looking Vampire Nurse.

Wish I was 30 again! :P

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Ordered a replacement unit for the left headlight. Should be here mid next week.  

Current AUDI part # appears to be 4F0 941 329 D.  "Power Module for Corning Light" .  > the one currently
installed has a "B" suffix. So, an update sounds promising 

attached more pics: I removed the "power unit" from the left headlight assembly for further inspection.
And popped it open, since it does not appear to be cooperating anyway.
 

20170428_111037.jpg

20170428_111157.jpg

Gee, I don't know. What could go wrong in here?  Looks pretty bullet proof, no? :lol:;):D :25_money_mouth:

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Posted (edited)

Also,  Not sure if a title change for this POST should happen, but  the AUDI acronym for
this sub-system is AFS,  is it not? (Adaptive Front-Lighting System) 

*AHL  is a BMW acronym, I believe. (Adaptive Headlamp Leveling)

Will let the ADMIN make a judgement call on this.  

Edited by Matt Conner

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Hey, I think BMW some days............Mercedes some days................and nothing some DAZE. :wub::108_metal::wacko::blink:

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OK.  This one finally came back in last week.  It was at the body shop for a while getting some {unrelated} paint work redone.....Back to the matter-at-hand:

VEHICLE IS FIXED.

Popped the new power-output stage control unit in the left head light and ran a fault code scan on AW55 "Headlight Range"  

Thursday,18,May,2017,11:39:53:36887
VCDS Version: Release 17.1.3 (x64) Running on Windows 10 x64
www.Ross-Tech.com

                Address 55: Headlight Range       Labels: 4F0-910-357.lbl
Control Module Part Number: 4F0 910 357 F    HW: 4F0 907 357 F
  Component and/or Version: AFS 1           H01 0020
           Software Coding: 0000255
            Work Shop Code: WSC 02325 785 00200
           Additional Info: 4F0941329D  AFS-Modul links H01 0010   4F0941329D  AFS-Modul rechtsH02 0020   
                      VCID: 29593B15806935099E-807C
4 Faults Found:

02629 - Sensor for Swivel Module Position; Left 
            008 - Implausible Signal - Intermittent
             Freeze Frame:
                    Fault Status: 00111000
                    Fault Priority: 2
                    Fault Frequency: 74
                    Reset counter: 40
                    Mileage: 178728 km
                    Time Indication: 0
                    Date: 2017.04.28
                    Time: 10:04:58

02656 - Power Output Stage for Left Headlight (J667); Not Coded 
            000 -  -  - MIL ON
             Freeze Frame:
                    Fault Status: 00111000
                    Fault Priority: 2
                    Fault Frequency: 74
                    Reset counter: 40
                    Mileage: 178728 km
                    Time Indication: 0
                    Date: 2017.04.28
                    Time: 10:04:58

01539 - Headlights Not Adjusted 
            005 - No or Incorrect Basic Setting / Adaptation - MIL ON
             Freeze Frame:
                    Fault Status: 11100101
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 216
                    Mileage: 178904 km
                    Time Indication: 0
                    Date: 2017.05.18
                    Time: 11:40:14

01042 - Control Module; Not Coded 
            000 -  -  - MIL ON
             Freeze Frame:
                    Fault Status: 11100101
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 216
                    Mileage: 178904 km
                    Time Indication: 0
                    Date: 2017.05.18
                    Time: 11:40:14

 

Performed "security access" function and then "coding"  for A6 - AFS1 "w/ steel suspension" .....module coded correctly, BUT then the basic setting for aiming adjustment would not run......error message.

REPLACED THE LEFT HEADLIGHT ASSEMBLY with a NEWER HELLA/OEM, which I had on stand-by just based on a hunch.....and then ran the Basic Setting for headlight aiming/adjustment.. :Bazinga:

Adaptive headlight warning now OFF and the system is functioning "normally" again.

I am suspecting that there might still be a compatibility issue between the older output stage control unit and the "newer" version of head lamp assembly,  but can not officially confirm any of that speculation.....Either way; it's FIXED!!! and, we got PAID, and the customer is HAPPY.    Drink a beer. go home.  nuff said.        

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