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it the horn activates randomly when driving and when the steering wheel is moved , the problem will be the ground contact under the steering wheel
there is a small spring loaded button that runs on a slip ring in the back of the steering wheel and intermittent/ random operation can be traced back to a fault in this area
the horn works so it is good , the fuses and relays are working to make the horn work so they are good ( unless there is a grounding problem with the relay causing the relay to operate and blow the horn)
MOST VEHICLES HAVE A HORN FUSE AND RELAY. CHECK FUSE VISUALY IF BAD REPLACE IF GOOD REINSTALL. WITH IGN KEY ON PRESS HORN BUTTON AND LISTEN FOR THE RELAY TO CLICK. IF IT CLICKS THE HORN ITSELF IS PROBLY BAD. TO CHECK HORN UN PLUG AND USE A TEST LIGHT TO CHECK FOR POWER WHEN THE BUTTON IS PRESSED. THEN CHECK THE GROUND VIA WIRE OR BODY GROUND.
The fuse for the horn would be in the power distribution box located under the hood in the engine compartment (see picture below). Also below is a diagram of the fuse layout. The fuse you want to check will be the fuse in the number 10 position and should be a 15 amp fuse. There is a horn relay as well and the is the relay in that same box in the number 7 position. I hope this helps and good luck.
Is the car a convertible? If so the window controls operate through the convertible top computer. By ignition switch module are you talking about the part under the lock cylinder? They do fail a lot. What do you mean by the relays are intact? Have you checked for power at each fuse with the key on?
Used ignition switches are just as likely to be junk as the one you are replacing. Check for power at both sides of the each fuse for each affected circuit. IF the car has an ignition lock relay swap it, and make sure the it has power, ground, and is being turned on by the key. I can't remember if it is under the dash or hood, or if it even has one.