I'd check those issues one at a time. Note the horn wiring diagram. I got the horn diagram because it is simple. The fuse is hot all the time, not only check the fuse, use a test light and check voltage at the horn fuse. The fuse and horn relay should be in power distribution center under the hood. If you pull relay and use jumper wire between terminals 30 and 87, with terminal 30 hot all the time, the horn should sound, If it does, problem is on control side of horn relay, left side, has to have voltage and ground. Top wire is voltage, bottom wire is ground. The wiring in steering column--clockspring--horn switch are all part of ground for the control side of relay. If the steering wheel has an airbag, have to disable and be careful with it when testing horn wiring circuits in the steering column.
Granted, your other problems maybe more involved? Check for applicable trouble codes
SOURCE: 1997 Plymonth Voyager horn does not work.
My van had the same problem. You need to replace the clockspring located in the steering wheel. Once replaced, the horn will work, the cruise will work, and the air bag light will shut off. Hope this helps!!! It worked for me!!
SOURCE: cruise control 1998 plymouth grand voyager not working
Check fuses under dash on drivers side, & fuse & relay box under hood on drivers side. I.D. for fuses & relays under hood on underside of cover.
SOURCE: my air bag light came on and my cruise control and
your clockspring under steering wheel has failed..there is a recall from chrysler for 1996-2000 ns minivans..even if recall was done before,clockspring is under a lifetime warranty..call your local dealer with your information..vin number,mileage and get it replaced
SOURCE: 1996 Plymouth Grand Voyager -horn and cruise
Check your horn connection at the horn and check your cruise control vacuum line at the brake master cylinder.
SOURCE: 1997 plymouth grand voyager cruise control problems
Try doing a "Brain Kill" on the van. Disconnect both battery terminals, and (MAKE SURE THEY ARE NOT CONNECTED TO THE BATTERY!!!!!) touch and hold them together for at least 10 seconds. Mopars hold onto their faults, even after the repairs. Huge problem for transmission shops, but that's another topic. My 99 Dakota had the Speed Sensor fail, and it wouldn't shift until I "Killed" the ECM and BCM's memories.
Good Luck!!!
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