Let me start by saying ive had these horns since i bought the car new, so they have worked previously. My horn stopped working on my 2006 Toyota Scion SB, its not the OEM horns, its a pair of air horns with a small compressor. The compressor has two leads, pos. and neg. Neg. I have attatched to a bolt on the hood latch frame, and the pos. I had connected to the green wire with red stripe that was connected to the horn(s). ive replaced the compressor, tested my wire for the neg. lead from end to end, passed continuity test, and the pos wire from the compressor end to the fuse/relay box in the engine compartment, it too passed. I have even replaced the four-male flag terminal fuse/relay that is in the horn position in that engine compartment fuse box. I dont
want to remove the steering wheel if i can avoid it since i dont want to mess with the air bag system. how do i test whatever switch is in the steering wheel so i can try and narrow down my problem.
Most new cars have what is called a clock spring be hind the steering wheel.this is a flat ribbon cable like what you would Se in a computer.what can happen when the ribbon is damaged is the horn can quit working.the cruse control .and the air bag light will come also.but most likely one of the problems will occur.but over time the other problems start happening also.so are you sure you are getting power to the relay .use a volt meter on the terminals under the relay and have someone to push the horn button.this will tell you if you are getting power from the horn button.
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