B2 horn failure

Minty · 12-02-17, 07:06 PM

Evening All

As title, my GT's horn has stopped sounding.

I haven't looked at it at all yet, but would appreciate any thoughts on the most likely causes to check first.

Thx.

4v6 · 12-02-17, 07:26 PM

Fuses first, check the wiring at the horn itself to check if its still connected, possible relay faulty and finally check for grounds and powers at the connectors.
Brown wire is ground, iirc the horn 12volt power feed is a balck and yellow striped wire so youll need someone to press the horn push whilst you probe for volts at that wire.

John. · 12-02-17, 07:47 PM

I'd be for removing the horn push/steering wheel centre and earthing the wire on the column......if horn sounds then horn push faulty (unlikely?!).
If you earth the wire to a known good earth point and the horn sounds then suspect your steering column isn't earthed correctly.........there may be a small earth wire in the engine bay from steering column to body which may be your problem??
Using an ohmmeter you could check the wiring between horn push and horn.
You will have 2 wires at horn, one should be battery voltage with ign on(if no voltage, check fuse), other is earth via horn push.
If above checks out it would be worth removing horn and whilst connected to battery turn the adjustment screw on the horn body.....it might start to work?!
2 horns on your car or one.

I've no exact knowledge of B2 horn set-up but the above is "about right"!

Minty · 12-02-17, 10:44 PM

Thx for the info Gents - gives me something to start from

Isimmo · 12-02-17, 10:45 PM

Have you had your hearing checked lately?...

Just a thought...

missfire · 13-02-17, 12:44 AM

Not as amusing as the last post... nor meant to be, but have you driven through any puddles recently? One of my 100s did that, stopped completely then started again when it dried out.

sounded like a tortured duck for a few days before it came fully back to life. But they are right under the car in front of the wheel, dunno where they are on a GT!

John. · 13-02-17, 07:34 AM

My thoughts and 4v6's post contradict a bit, mine suggests the horn has a permanent live and is earthed at the horn push like the B3. His suggests the horn is permanently earthed and gets supply when horn push is pressed.....his also has wire colour codes....I'd go with his!

Hanuman · 13-02-17, 11:35 AM

I believe there's a horn relay. Position 7, according to the big red Bentley book, and a fuse in position 3. So that would hint at switched live.
That said. The horns on my quattro died about 20 something years ago, and got replaced with a twin pack from somewhere.

4v6 · 13-02-17, 05:37 PM

Quote:

Originally Posted by John.

My thoughts and 4v6's post contradict a bit, mine suggests the horn has a permanent live and is earthed at the horn push like the B3. His suggests the horn is permanently earthed and gets supply when horn push is pressed.....his also has wire colour codes....I'd go with his!

Id go with Johns, mine was a guess.

Sie! · 13-02-17, 06:45 PM

My B2 horn failed a couple of years ago, when you push the steering wheel you should be able to hear the relay click, if this happens then check the wires to the horn, after 30 years mine were brittle and had come away inside the spade plug connector at the horn itself.

12-02-17, 10:44 PM	#4
Minty Senior Member Classic Audi Club Member Join Date: Jul 2008 Location: Wirral Posts: 1,528	Thx for the info Gents - gives me something to start from __________________ 1984 GT5E Topaz Green 1982 GT5S Helios Blue - now in Ireland 1983 GT5E Topaz Green - donor 1986 GT 2.0 Tornado Red - long gone 2001 A6 2.4 V6 - exported to Ireland

12-02-17, 10:45 PM	#5
Isimmo Super Moderator Classic Audi Club Member Join Date: Jul 2007 Location: Sissix-by-the-sea Posts: 15,218	Have you had your hearing checked lately?... Just a thought... __________________ 1985 WR quattro, 1985 20vT RallyRep, 1993 MTM ABY S2 Avant. 2010 S3 Sportback.

13-02-17, 12:44 AM	#6
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,154	Not as amusing as the last post... nor meant to be, but have you driven through any puddles recently? One of my 100s did that, stopped completely then started again when it dried out. sounded like a tortured duck for a few days before it came fully back to life. But they are right under the car in front of the wheel, dunno where they are on a GT! Last edited by missfire; 13-02-17 at 12:47 AM.

13-02-17, 11:35 AM	#8
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,006	I believe there's a horn relay. Position 7, according to the big red Bentley book, and a fuse in position 3. So that would hint at switched live. That said. The horns on my quattro died about 20 something years ago, and got replaced with a twin pack from somewhere. __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor Last edited by Hanuman; 13-02-17 at 11:43 AM.

12-02-17, 07:26 PM	#2
4v6 Ex Member Classic Audi Club Member Join Date: Dec 2007 Posts: 5,565	Fuses first, check the wiring at the horn itself to check if its still connected, possible relay faulty and finally check for grounds and powers at the connectors. Brown wire is ground, iirc the horn 12volt power feed is a balck and yellow striped wire so youll need someone to press the horn push whilst you probe for volts at that wire.

12-02-17, 07:47 PM	#3
John. 4 ring whore! Classic Audi Club Member Join Date: Mar 2011 Location: Scottish Borders. Posts: 7,520	I'd be for removing the horn push/steering wheel centre and earthing the wire on the column......if horn sounds then horn push faulty (unlikely?!). If you earth the wire to a known good earth point and the horn sounds then suspect your steering column isn't earthed correctly.........there may be a small earth wire in the engine bay from steering column to body which may be your problem?? Using an ohmmeter you could check the wiring between horn push and horn. You will have 2 wires at horn, one should be battery voltage with ign on(if no voltage, check fuse), other is earth via horn push. If above checks out it would be worth removing horn and whilst connected to battery turn the adjustment screw on the horn body.....it might start to work?! 2 horns on your car or one. I've no exact knowledge of B2 horn set-up but the above is "about right"!

13-02-17, 07:34 AM	#7
John. 4 ring whore! Classic Audi Club Member Join Date: Mar 2011 Location: Scottish Borders. Posts: 7,520	My thoughts and 4v6's post contradict a bit, mine suggests the horn has a permanent live and is earthed at the horn push like the B3. His suggests the horn is permanently earthed and gets supply when horn push is pressed.....his also has wire colour codes....I'd go with his!

13-02-17, 06:45 PM	#10
Sie! Grown up member Classic Audi Club Member Join Date: Nov 2007 Posts: 825	My B2 horn failed a couple of years ago, when you push the steering wheel you should be able to hear the relay click, if this happens then check the wires to the horn, after 30 years mine were brittle and had come away inside the spade plug connector at the horn itself.