A8 Parts Forum  

Go Back   A8 Parts Forum > A8 D2 > D2 - Lights

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

Reply
 
Thread Tools Display Modes
  #1  
Old 24th May 2020, 11:52 AM
Ronin Ronin is offline
Banned
 
Join Date: Jul 2019
Location: Wales
Posts: 847
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...
Attached Thumbnails
Click image for larger version

Name:	IMG_20200208_153833.jpg
Views:	874
Size:	394.9 KB
ID:	23370  
Reply With Quote
  #2  
Old 24th May 2020, 12:34 PM
MikkiJayne MikkiJayne is offline
Senior Member
 
Join Date: Jan 2012
Posts: 5,017
Default

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.
Reply With Quote
  #3  
Old 24th May 2020, 09:28 PM
Ronin Ronin is offline
Banned
 
Join Date: Jul 2019
Location: Wales
Posts: 847
Default

Will do. Thanks Mikki.
Reply With Quote
  #4  
Old 1st June 2020, 04:55 PM
Ronin Ronin is offline
Banned
 
Join Date: Jul 2019
Location: Wales
Posts: 847
Default

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
Reply With Quote
  #5  
Old 30th September 2020, 10:14 PM
Ronin Ronin is offline
Banned
 
Join Date: Jul 2019
Location: Wales
Posts: 847
Default

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.
Attached Thumbnails
Click image for larger version

Name:	Untitled.jpg
Views:	347
Size:	264.4 KB
ID:	24047  

Last edited by Ronin; 30th September 2020 at 10:16 PM.
Reply With Quote
  #6  
Old 10th January 2021, 05:26 PM
Ronin Ronin is offline
Banned
 
Join Date: Jul 2019
Location: Wales
Posts: 847
Default

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.
Attached Thumbnails
Click image for larger version

Name:	IMG_20210110_164949.jpg
Views:	295
Size:	1.04 MB
ID:	25106   Click image for larger version

Name:	IMG_20210110_142958.jpg
Views:	311
Size:	404.9 KB
ID:	25107   Click image for larger version

Name:	IMG_20210110_161411.jpg
Views:	311
Size:	396.5 KB
ID:	25108  
Reply With Quote
  #7  
Old 10th January 2021, 08:39 PM
MikkiJayne MikkiJayne is offline
Senior Member
 
Join Date: Jan 2012
Posts: 5,017
Default

You need to do basic settings to calibrate it.
Reply With Quote
  #8  
Old 13th January 2021, 07:13 PM
Ronin Ronin is offline
Banned
 
Join Date: Jul 2019
Location: Wales
Posts: 847
Default

Hmmm, VCDS Lite doesn't seem to support this option. I may have to get the proper full version to do this
Attached Thumbnails
Click image for larger version

Name:	IMG_20210113_165942.jpg
Views:	261
Size:	241.2 KB
ID:	25148  
Reply With Quote
  #9  
Old 21st January 2021, 07:37 PM
Ronin Ronin is offline
Banned
 
Join Date: Jul 2019
Location: Wales
Posts: 847
Default

Full Version of VCDS also shows basic settings as unavailable.
I think this is because the voltages on both sensors are out of range which is 1.7 to 3.5V.

I made sure the new arms for the new febi sensors were exact lenght, and at the time of VCDS measurement the car was at a large Morrisons car park, so the ground was really really flat. Very strange.
I'll try adjusting the lenght of the arms (which will adjust the volrtages) next i think...
Attached Thumbnails
Click image for larger version

Name:	IMG_20210121_144112.jpg
Views:	265
Size:	361.7 KB
ID:	25245   Click image for larger version

Name:	2.jpg
Views:	252
Size:	513.6 KB
ID:	25246  
Reply With Quote
  #10  
Old 21st January 2021, 07:43 PM
MikkiJayne MikkiJayne is offline
Senior Member
 
Join Date: Jan 2012
Posts: 5,017
Default

Is it lowered? That causes problems with the basic settings. I have to pick mine up on the lift a couple of cm before it'll calibrate
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 08:23 PM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.