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Obli
Camped on the site



Joined: Aug 06, 2005
Posts: 231

PostPosted: Sun Mar 23, 2014 5:36 pm Reply with quote Back to top

Hi all,

On my 90 20V (2WD), the orange ABS light turns on with the ignition and stays lit.

I thought I would try the simple check first - check the red 10A fuse on top of relay 76 (part no. 443927826). This relay is found under the driver's side foot-well. The 10A fuse is good - visually and continuity checks out.

I'd like to test the relay, if possible. I have a multimeter. I get infinite resistance between pin 30 and 87, so the normally-open relay (guessing from the diagram) is open. Are there any electrical gurus out there that could help an amateur like me, please? Smile

I found this schematic, but I am struggling to understand it. The pin numbers match what the 76 relay has:

 
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Audicted
Needs to get out more



Joined: Feb 07, 2011
Posts: 114

PostPosted: Tue Mar 25, 2014 2:37 pm Reply with quote Back to top

Maybe one of your wheel sensors aren't properly mounted. Just saying.
 
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Petescoupe
Inexperienced



Joined: May 24, 2014
Posts: 45

PostPosted: Thu Aug 28, 2014 3:32 pm Reply with quote Back to top

Hi,

Did you get to the bottom of this? I have the same issue as yourself
 
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audiall
Audi Nut



Joined: Feb 04, 2010
Posts: 62

PostPosted: Sat Aug 30, 2014 12:26 pm Reply with quote Back to top

http://www.isham-research.co.uk/quattro/wiring/Typ85/abspin.html look on this site at the abs system for 1991 car it gives you the whole story including test procedures pinouts and all in the notes on abs ..allan....
 
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