I just wired a new horn on my 97 Nissan and it won't work. I had wired the same horn weeks prior and it only worked for a week. The relay and fuse are good. Should I check the sterring wheel?

Horn relay

If it's blowing fuses, you probably have damaged wiring to the horn, not a bad relay (relays generally fail open rather than with a short to ground). Find the horns (GM usually uses two horns to play a chord), and inspect the wiring to them. Look for a bent terminal shorting to ground, or some spot on the wire where the insulation has been cut or worn by contact with metal. In particular, if the car has been in an accident, check the areas where there was body damage (if the horn relay was bent up by an accident, that may be an exception to the general case that relays themselves don't usually blow fuses.

A bad switch or wire or connection of the wire to the horn. Try to jump a wire from positive termananl to the horn connection. If it
works the horn is ok. the problem is wire, possibly relay or connections. Back track the wire from horn to the next connection

The horn button makes ground to operate the relay. If you hear the relay clicking but the horn doesn't sound, then the horn itself is faulty. If you don't hear the relay click, then the horn button in the steering wheel or the wiring going to it is suspect.

You do not have the ability to work on today's
technology
You need a dealer or local shop to work on it

i'd say 2 completely different issues,did key work when you bought vehicle,i'd say ones a replacement and they may not have coded it to immobiliser,horn may be horn itself ,but often the moving parts behind steering wheel fail,have you checked the fuse?the relay can often fail to

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In most cases this problem is caused by the rotating ribbon circuit contact under the steering wheel having a broken filament, the part is known as a clock spring contact, u will need to properly disarm the airbag and remove the steering wheel to access the part. WARNING: Failure to disarm the airbag system can result in an unexpected Airbag deployment and possible serious personnel injury disconnect the battery 30 minutes prior to start of work.

Maybe horn became unplugged. Put 12 v power to horn make sure horn works. Put test light on terminal on horn have someone press the horn button, if light comes on and horn does not blow you may need new horn. if light does not come on you may have bad contact at horn button, blown fuse, broken wire, bad horn relay or possibly just a bad ground.