A4 B7 AFS Xenon Headlight Module

[Richie Taylor]

Hi All,
I have an issue with Headlight module on my B7 Cab resulting in the yellow AFS warning on the dash.
Headlights work perfect, so far I've....

Ran VCDS scan and the below error was displayed :

Sunday,27,June,2021,14:51:37:22202
VCDS Version: Release 21.3.0 (x64) Running on Windows 10 x64
Ross-Tech: Home


Address 55: Headlight Range Labels: 4F0-910-357.lbl
Control Module Part Number: 4F0 910 357 E HW: 4F0 907 357 E
Component and/or Version: AFS 1 H01 0010
Software Coding: 0000019
Work Shop Code: WSC 00672 785 00200
Additional Info: 8E0941329 AFS-Modul links H03 0020 8E0941329 AFS-Modul rechtsH03 0020
VCID: 2809F238EEF670EBE73-807C
1 Fault Found:


02233 - Left Headlight Power Output Stage (J667)
014 - Defective - MIL ON
Freeze Frame:
Fault Status: 11101110
Fault Priority: 2
Fault Frequency: 1
Reset counter: 40
Time Indication: 0

So, I swapped the module to the other side and the fault moved with it, therefore I know the module is at fault.

Being an AFS unit, they are expensive to replace, so looking to repair if possible.
I've stripped the unit and it's nice and clean / dry inside so the issue isn't down to water ingress.

Can anyone offer any advice on suspect components?
A bit of a google shows the Capacitor and FET in the output stage are a couple of the most likely causes does anyone have any experience of this or any pointers?

Thanks

[Richie Taylor]

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[Richie Taylor]

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[Richie Taylor]

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