Hi All. I have a '90 S4. Horn blows while driving, at a standstill with engine on and off sometimes stops, but usually doesn't stop. Pulled fuse. Any ideas, suggestions on how to determine what is or isn't happening. Thanks in advance for your help. Rich

 

Sounds like the steering wheel horn collar is touching the copper contact strip inside the steering wheel hub.

You need to pull the steering wheel horn cover and see what is going on. I can’t recall exactly but you should have to pull the wheel. The horn cover pieces are all press fit but be gentle.

 

Thanks for the info. NC928S4. I'll give it a try.

 

'90 S4 has an airbag ... the horn signal goes through the clockspring. I bet it's one of the two horn buttons stuck or shorted.

 

Is there left-right play in the steering wheel?

This could also be caused by a broken steering shaft bearing.

 

Hi Randy. I don't believe there is any play in the steering wheel, but I'll check it out to confirm. thanks . rich

 

Carefully check the possibility of a stuck button first. If you have to pull the wheel, "be werry, werry careful". It could be possible to blow the airbag in your face, and it is very easy to screw up the "clock spring" - $$$.

 

These two links might help:
http://jenniskens.livedsl.nl/Technic...6/MyTip675.htm
This is for a 964, but very similar:
http://jenniskens.livedsl.nl/Technic...9/MyTip970.htm

Like Wally said: make sure the airbag does not blow in your face. Disconnect the battery and wait for half an hour before touching the airbag. Carefully put it away in a safe place.

regards

 

Funny, assume everyone knows ... before messing with any airbag, disconnect the battery and allow a good half-hour for residual charge in the capacitors to dissipate. Then work from either side of the wheel (ie. not facing it) when releasing the two fasteners, the bag itself and finally, the connector from the back of the bag. Also, make sure you understand the correct centering procedure for the clockspring before putting the wheel back on.