Originally Posted by silversport

I had the same problem on my 99 Accord a year ago. Factory alarm. Only difference was that the key fob would sometimes unlock the passenger door but not the driver door. The car would usually start, sometimes not but it would set off the horn. The whole problem was intermittent. Turned out to be the passenger side multiplexer ($120 part, $180 to install). I think the install is pretty easy if you want to do it yourself. I can get the part # later today if you are interested.