Plymouth Voyager 1998 horn

My car is a Plymouth Voyager 1998 model, the very basic model of the range.

I have a problem with the horn and cruise control on my car, they don't work. Also the airbag lamp remains displayed, so I assume the clock spring behind the steering wheel is faulty. During my investigation I found there was a fault in another part of the horn circuit, between the relay and the horn switch, both of which do work. The wire at the relay is gray with an orange line, the wire at the steering wheel is black and white as it enters the clock spring. There are two connector blocks at the clock spring, a yellow with two cores, I assume these are for the airbag. The white connector has three wires, a black with green line, a red with green line and a black with red line. I think the black with red line is for the horn, but can't be sure as the color is different at the relay. Can anyone tell me if this is right and where else the wire goes before it gets back to the relay. If you have a full wiring diagram for this car I would very much appreciate a copy.

Thanks for your attention and help.