I have exactly the same problem on our family car.
I was advised to see if the airbag light was due to the seat belt tensioner being disturbed by junk under the seats (supposidly a yellow sleeve). I have still to do this.
No idea about the horn yet. I was wondering if they were linked as well. The manual steers you away from changing relays. Could it be this element?
Did you get an answer at all?
September, 30, 2009 AT 8:50 PM
Inside the steering wheel is a componet called a clockspring it alows power form sterring wheel mounted controles to conect to the colum and still alow the steering wheel to turn sounds like the clock spring may be broken.