1999 plymouth voyager insterment panel cruise control and horn does not work any suggestions

The first thing is to check all your fuses, this vans have problems with the clusters going bad, you can remove it and make sure the connection is good, remove it and then plug it back and see if cluster starts working, if not then replace it, this may be related to other problems but it may not , the common problem with the cruise and horn not working reminds me of a bad clock spring, this is the unit is steering column thats like a rooll of flat wires that make the connection to horn and cruise as you turn the wheel, heres a picture of it,it works like a window shade, goes in or out as you turn the wheel. hope this helps.

The most common problem is the instrument cluster. I've recommended that the dash be hit relatively hard just behind the wheel for diagnostic purposes only. If you check my profile, you'll see that it works. If the cluster contacts are bad then all will start working...for a day...week...year. Each van is different. Turn the key on, look at the dash, and bonk the dashboard. But don't break it or you. Might take a few tries. Then look into getting a new or used instrument cluster.