10 amp fuse located under the hood on the drivers side fuse block........there is also a horn relay that is in that same fuse block.......if both of these are good get a test light and unplug the horn and get someone to hold the horn on while you check and see if you have power going to it.if you do then you know that the horn is bad and sometimes you can tap on it and get it to work......if you do not have any power and youknow for sure that the fuse and the relay are good then i would be checking the spiral cable. it is a ribbon that has wires in it and spins as the steering turns and the will break sometimes.......i would let a certified technician check this as it is part of the air bag system......good luck and i hope this info will help you......let me know or fixya know if i did my job and a thumbs up........thanks and if i can help you any further let me know i have been working on toyota and lexus for 25 yrs.................
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