I have 1999 Accord EX 3l exactly same problem as you where horn and radio controls on steering wheel only work when turning wheel off-center. Had dealer install new clock spring still has same problem. Probably bad harness connector at clock spring or airbag. Maybe bad ground. Not sure what to do next. Does any one know where the ground comes (wire color?) into the airbag to allow the horn switch to activate the horn relay?