One problem related to horn assembly has been reported for the 2004 Dodge Dakota. The most recently reported issues are listed below.
The horn stopped working, I took it to a non-dealer mechanic who found the horns themselves operational when applying an external relayed voltage to them and no fuses blown, he thought it may be a short in system. Horn would not work on many occasions, then one day it worked, the next day it did not. A couple of months later it wouldn't work, I have a tilt steering wheel so I moved it to an upright position, the horn started working, I put the tilt wheel back down and it still worked. The next day the horn wouldn't work even if moving the tilt steering up or down. It seems as if there may be an intermittent short of some kind in the wiring for the horn in the steering column. It has an air bag so it isn't an easy investigation. I haven't taken it to a dealer as Chrysler was closing outlets and I haven't found one to use yet.