I think it's the relay, but I put in new bulbs in my gauge cluster and consequently had to remove the lower part of the dash, and now the air horns won't go off with the Viper 790xv alarm, the strobes will go off, but the air horns won't, they work when you beep the horn. uhh help?

 

check all of your wiring, more specifically the wiring to the air horns. If the strobes or siren are running off of the same relay as the air horn, the relay is fine.

Most likely there wasnt a good connection and it came loose when you took out the lower dash

 

There are 2 relays, one for the strobes to go off with the alarm, the other I suppose for the air horns to go off with the alarm.

 

switch the two relays. If the horns start working and the strobes dont then its a faulty relay. If the strobes work still but the horns dont then its the wiring.