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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.
You have all the informations to find your problem. jump a wire on connector X4 G1 tan wire to ground and check X1 E5 with a test light or multimeter to see if there is a output, you should have 12 volts. If you dont have any voltage the horn relay is defective. I check in the shop manual and the relay come with the underhood fuse block.
If the alarm horn is the same unit used as the car horn then your problem is the contacts for when the horn is pressed. Some horns are activated by pressing the large center area of the steering wheel others have little buttons on the left and right side of the steering wheel. If the latter is the case make sure you try both pressure buttons to see if horn will work. Either way the contacts have to be cleaned or the wheel needs to be adjusted to allow the contacts to touch each other when pressed. That's most likely your problem.
I would check for the following:
4. Horn itself (disconnect it from the car, use a wire to connect to horn and tap it directly to the battery, if it horns then it is ok, if not probably need a replacement.
5. Push button on the steering wheel
6. Rotor contact on the steering wheel
check horn fuse
measure voltage at horn
one wire will be earthed to car body hopefully and the other wire will get plus 12 volts when the horn is pressed.
or one wire is always 12 volts and the other wire is connected to earth when horn button pressed.
check fire wall of car some kia have horn on firewall in engine compartment. or it is under the grill in front of car.
you need to find the wire connected to the horn of the vehicle and follow it back to through the firewall and make sure that it is connected to the horn itself. If not you will need to run another one. Also check the fuses
a very common cause of this problem is the steering wheel mounted horn button looses it's connection to the horn circuit due to a defective ribbon rotating contact under the steering wheel, the special clock spring shaped ribbon wiring harness is what allows you to turn the wheel and still have a connection to all steering wheel buttons and the airbag, to check this listen for a click when u press the horn button with the engine off, it will be faint but if u listen closely u will hear it, if u don't hear it u will ned to replace the Clock-Spring rotating contact under the steering wheel. I am a Ford factory trained tech with 20 years of new car dealer experience.
If your Air Bag light light is aluminated and The Cruise Control does not Work then the Problem is in the "CLOCK SPRING" this Component is Located Under the Steering Wheel and it requires the Steering Wheel to Be Removed.You Must have Complete Instructions on this Procedure or Injury Can Be the result.
Todd, If your Air Bag Light is on and your cruise control does not work. Contact me before doing the test procedure below!
Todd, sense you have the steering wheel cover off, we need to check to see if it will honk when you take the ground wire for the horn and ground it anywhere to a good ground, preferably the ground post from the battery. We know this is always a perfect ground! The wire for the horn will be a single wire all by itself. If it doesn't Honk see below.
Next: Next we want to ground the horn wire coming out of the other side of the steering wheel, this is much harder but will tell us what we need to know.
you need to Check the Wire inside the Steering wheel, When Grounded by pressing horn button the relay will send the 12 volts to Horn,
You Also could and Please Re-check the Color of wire for the Horn SHOULD be a Black Wire in the wire loom Under the Dash on the Column and If you Ground down the Black wire from Under the dash, You would Find out If it is In fact the Steering wheel it self,
you could also add a Second Button on the Dashboard