Was Cruise Control working before the New Horn was installed? The power supply to the Horn, (input to ground wire) is connected to the Cruise Control Module (CCM). This CCM is wired to the Relay Switch Box located in the Engine Bay. The Relay Box cover will have a Chart indicating what function each Relay coresponds to. Your local autoparts store (AutoZone) can test the Relay Switch, and you'll know (if any Relay) need to be replaced.
The CCM is also wired to the Steering Wheel, but first passes through the Clock Spring Coil, located just behind the Steering Wheel. The Clock Spring allowes for the Function Buttons on the Steering Wheel to have power while Steering Wheel spins.
The Clock Spring can malfunction or break, its rare, but this will cut power to the Function Buttons on Steering Wheel. If ALL the buttons on Steering Wheel dont work, then the Clock Spring is the Culprit. The Coil may need to be replaced.
The Cruise Control Module itself may have failed and also would cause a few or all Steering Wheel Functions to quit working.
But first check the Relay Switch Box and examine the Harness Cables connecting (Steering Wheel--to--CCM--to--Relay Switch Box--to--Battery Supply).
Also if Cruise Control was working before the new Horn was installed and now not working, then most likely the Problem is a bad wire connection somewhere and/or is a faulty Relay.
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SOURCE: SRS light stays on
This is most likely a wiring issue in the steering column. I advise you not to attempt to repair this on your own unless you are an experienced mechanic. If you do be very cautious as the airbag wiring runs through there and can be a very dangerous mistake.
SOURCE: steering wheel controls
Replace the clock spring, or check all the cabling and plugs first. If you are inexperienced take it to an auto electrician, otherwise do it yourself but disconnect the negative battery terminal for 2 minutes prior to opening the steering wheel to check the plugs, as not doing so could cause the airbag to go off. In addition you can also take out the airbag fuse. Check radio control plugs and close it up again and reconnect everything in reverse order. If that doesn't fix it, then have the clock spring replaced professionally, its too much mucking around if you don't know what you're doing.
SOURCE: Horn, Steering Wheel, Cruise Control
Replace the Clock spring. It is mounted behind steering wheel. It alows electrical connection while the wheel turns.
SOURCE: Horn, cruise control, and radio controls on steering wheel do not work ?
The clockspring behind the steering wheel is possibly defective or unplugged. It is the one and only component that all of your symptoms have in common.
SOURCE: the horn and cruise control doesn't work,fuses are
the horn input to ground is located in the cruise control module. if they both don't work then your cruise control module or the clockspring coil for the steering wheel needs to be replaced. If airbag lights is on as well then I would change the clockspring coil first.
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