That really is crazy.....I have a 92' Eurosport, but my grandma has the 90' 2.5L and we were at her house for christmas and the damn horn started going off.....I didn't know what to do but pull the horn cover off on the steering wheel that fixed it so I think the plastic on that piece just shrunk cause of the cold and pushed the contacts together....You might try taking that loose and charging it up again.....I'm shure you got it fixed allready since that was so long ago....But just incase or if anyone else has any problems like that....