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D2 - Lights Headlights, xenons, foglights. Everything outside the car that glows

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  #1  
Old 24th May 2020, 11:52 AM
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Default Help in diagnosing xenon range control required

So I've had errors 0774 and 0776 since purchasing the car, so I tried to fix it by following this http://forum.a8parts.co.uk/showthread.php?t=12058 thread to renew the harnesses which I've succesfully done but after resetting the errors and going for a drive, the errors immediately come back.

Should I replace the sensors next or maybe the headlight aim control module? Is there a way to further test the output of each module? I'm really not sure how to tackle this...
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Old 24th May 2020, 12:34 PM
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Replace the sensors. They're the same on B5 A4, C5 A6 / Allroad and 8N TT so plenty of them about. Aftermarket sensors often come with the link arm which obviously doesn't work on the D2, but the sensor itself is the same.

Ymmv with Chinesium versions of course.
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Old 24th May 2020, 09:28 PM
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Will do. Thanks Mikki.
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Old 1st June 2020, 04:55 PM
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Update:

Yes it was the 2 xenon position sensors. After I replaced them I didn't even need to clear any codes it vag com
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Old 30th September 2020, 10:14 PM
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Update 2:

After about 30mins of driving the error came back, and comes back anywhere between 15 to 30 minutes of driving.

So far I've changed the 2 modules and re-did all the wiring.

Could it be the cheap chinese modules? The thing is once I replaced the sensors the error on dash cleared itself so they were obviously detected and worked for a little while.
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Last edited by Ronin; 30th September 2020 at 10:16 PM.
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Old 10th January 2021, 05:26 PM
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Update:
I eneded up replacing the sensors yet again, with Febi units. Now im getting the
'01539 headlights not adjusted' error, but the two previous errors have now gone.
Have I got the levers wrong or something? Or do they need to some kind of calibration? the voltage between front and rear sensors are way off.
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Old 10th January 2021, 08:39 PM
MikkiJayne MikkiJayne is offline
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You need to do basic settings to calibrate it.
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Old 13th January 2021, 07:13 PM
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Hmmm, VCDS Lite doesn't seem to support this option. I may have to get the proper full version to do this
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