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If the alarm makes the horn work, then it is not the relay. It is the horn contact or slip ring. You need to take the cover off the steering wheel center. But this could be dangerous due to air bags. Disconnect battery first. Steering wheel might have to come off. Recommend a shop because most people don't have the tools for pulling steering wheel.
easiest way to check a relay is to swap it with an identical, known good relay. look at the part number on the horn relay, find a matching one in the fusebox (maybe A/C compressor or low beam). if it still doesn't work, have someone press horn while you touch the relay. you should feel it click if it is activating. if it clicks, the switch is good. if not, the switch is not sending power to activate relay
It might be the horn fuse.
first try to locate the fuse for this horn.
if fuse is good, try to check the horn switch electrical contact on your steering wheel (it might went loose)
hope this helps..
do you have a alarm on it. If so you need to disable it or turn it off. Other wise you have a short somewhere in your horn. disconnect the horn under the hood. Its usually upfront and looks llike a flat black circular device that has one wire going to it, unless you have a alarm then it may have more.
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