Main Beam Flash - AudiWorld Forums

Notices
A8 / S8 (D2 Platform) Discussion Discussion forum for the D2 Audi A8 and S8 produced from 1994-2002

Main Beam Flash

Reply

 
 
Old 01-19-2014, 12:39 PM
  #1
AudiWorld Newcomer
Thread Starter
 
Join Date: Jan 2014
Posts: 5
Default Main Beam Flash

Hi all,

I'm kinda guessing that cars from other countries have this same feature so apologies up front if this isn't an issue for anyone else.

Basically, my main beam work when on permanent (stalk pushed back) but not on flash (stalk pulled forward).

I've put a request in a British forum but haven't had any luck - http://forum.a8parts.co.uk/showthread.php?t=7464

I think this it is probably a relay but that means there must be two and I don't know where either are. Can anyone help me locate the main beam relays?

Thanks in advance, Matt.
humdigadi is offline  
Reply With Quote
Old 01-20-2014, 06:35 AM
  #2
AudiWorld Super User
 
silverd2's Avatar
 
Join Date: May 2010
Location: East TN
Posts: 2,546
Default

Originally Posted by humdigadi View Post
Hi all,

I'm kinda guessing that cars from other countries have this same feature so apologies up front if this isn't an issue for anyone else.

Basically, my main beam work when on permanent (stalk pushed back) but not on flash (stalk pulled forward).

I've put a request in a British forum but haven't had any luck - http://forum.a8parts.co.uk/showthread.php?t=7464

I think this it is probably a relay but that means there must be two and I don't know where either are. Can anyone help me locate the main beam relays?

Thanks in advance, Matt.
1st, when asking for specific help, include the year and country of the car...many things change from pre-facelift to facelift models and drive sides.

Because I'm a smart guy , I'm assuming you have a RHD PFL ('98 or before?) model.

The car only has one lamp control module (large relay)...see drawing below. which shows 2 locations in the relay panel, but is actually one large relay covering the 2 spots. In LHD models, it is in the large central electrics panel under the passengers footrest panel.

There is only one pathway (wiring) from the bright/flasher switch to the lamp control module. The only separation is 2 sets of contacts in the switch itself.

I'd put my money on the switch...not the module (relay).

silverd2 is offline  
Reply With Quote
Old 01-20-2014, 08:46 AM
  #3
AudiWorld Newcomer
Thread Starter
 
Join Date: Jan 2014
Posts: 5
Default

Thank you for the reply and I apologise for not adding that. It is indeed a 1997 PFL car. It is a RHD 4.2 Quattro Sport.

Sorry to sound stupid (I'm not a smart guy when it comes to cars!), when you say you think it's the switch, do you mean the switch in the stalk?

The reason I didn't think it was that was because of the change in voltage at the bulb plug when I pull the lever (videos in the UK forum post).

Thanks,

Matt
humdigadi is offline  
Reply With Quote
Old 01-21-2014, 06:27 AM
  #4
Audiworld Junior Member
 
Join Date: May 2012
Posts: 35
Default His suggestion of the switch (stalk) is probably correct.

the switch inside the stalk is a common failure point amongst various models in the late 90s-early 2000s. I recently experienced a failed switch, its a 30 minute fix.

In this video you can see the two switches (white). what happens is the white plastic melts slightly, preventing the contact point from conducting the current properly.

Inspect both pieces of plastic for melted areas. If you find melted plastic, trim it away so the contacts can engage properly.

icrashcars is offline  
Reply With Quote
Old 01-21-2014, 07:03 AM
  #5
AudiWorld Super User
 
silverd2's Avatar
 
Join Date: May 2010
Location: East TN
Posts: 2,546
Default

Originally Posted by humdigadi View Post
Thank you for the reply and I apologise for not adding that. It is indeed a 1997 PFL car. It is a RHD 4.2 Quattro Sport.

Sorry to sound stupid (I'm not a smart guy when it comes to cars!), when you say you think it's the switch, do you mean the switch in the stalk?

The reason I didn't think it was that was because of the change in voltage at the bulb plug when I pull the lever (videos in the UK forum post).

Thanks,

Matt
Sorry, I only looked at the first video which seemed to show no response from the pulled back (flash) position.

1st, as I understand (from videos), you have the meter connected at the headlight connection (behind the bulbs)?

If so, it looks as though the problem could be with a connection there...maybe passengers side only(?). I'd look closely at the contacts in the connector and on the bulbs themselves...maybe even try a new set of bulbs.

I may have read this wrong, but wiring diagrams show that the high beam circuit doesn't even pass through the lighting module or any relay, just a simple on/off circuit at the switch and separate dedicated fuses for left or right high beams.

Again, judging from your tests, a problem at the headlights (connections/grounds) themselves...not the switch or light relay.

Just a long distance guess from the info available.
silverd2 is offline  
Reply With Quote
Old 01-21-2014, 09:36 AM
  #6
AudiWorld Newcomer
Thread Starter
 
Join Date: Jan 2014
Posts: 5
Default

Thank you both for your help, it really gives me something to go on. I'll have another look this weekend and let you know.

Matt
humdigadi is offline  
Reply With Quote
Old 01-21-2014, 10:12 AM
  #7
AudiWorld Newcomer
Thread Starter
 
Join Date: Jan 2014
Posts: 5
Default

Sorry I should have also answered your question too.

I have the meter connected at the main beam connection behind the bulbs. In each of the videos I tried all variables, one with the left bulb out, one with the right while the other two have both bulbs out but the meter in either side. I'm not sure if you can see the spreadsheet attached to the same post but the readings were pretty consistent. I therefore thought it must be the bulbs but I asked at a local motor factors and they said because they work in permanent (stalk pushed back) then it won't be. I think they are upgraded bulbs so I may well try some normal halogen OEM type too.
humdigadi is offline  
Reply With Quote
Old 01-22-2014, 07:02 AM
  #8
AudiWorld Super User
 
Join Date: Apr 2003
Location: Full-time Coloradoan now
Posts: 3,704
Default

The melted plastic contamination of headlight switches was a common issue in the original Audi V8s (1990-1993 because Audi wired directly from the switch to the lights. Those of us with those cars resolved the issue by installing relays between a power source and the lights that were triggered by the wiring from the switch. That, of course, was after either cleaning or replacing the switch.
Kneale Brownson is offline  
Reply With Quote
Old 01-25-2014, 05:48 AM
  #9
AudiWorld Senior Member
 
twentysevenlitres's Avatar
 
Join Date: Aug 2006
Location: Melbourne, Victoria, Australia
Posts: 853
Default

Originally Posted by silverd2 View Post
I'm assuming you have a RHD PFL ('98 or before?) model.

The car only has one lamp control module (large relay)...see drawing below. which shows 2 locations in the relay panel, but is actually one large relay covering the 2 spots. In LHD models, it is in the large central electrics panel under the passengers footrest panel.
On RHD models it is also under the passenger footrest panel (ie. left hand side).
Ironically the fuse panel is still on the right hand side, restricting footwell leg room and causing Audi to never offer a manual gearbox in RHD models... pity.
twentysevenlitres is offline  
Reply With Quote
 
 
 

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
spit03
A7
6
01-31-2017 03:03 PM
nZtiZia
Q7 Discussion
3
12-04-2015 02:23 PM
iamdrewseph
A8 / S8 (D3 Platform) Discussion
5
10-01-2015 11:33 AM
SJGQ5
Q5/SQ5 MKI (8R) Discussion
4
10-01-2015 08:44 AM
Eurylo
A4 (B5 Platform) Discussion
0
09-28-2015 04:36 PM

Thread Tools
Search this Thread
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 08:08 PM.


 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: