when i lock the doors the alarm dont sound.
when i pop the hood an push the panic button I can hear it but its very quiet.
How do I correct this problem with out having to take it to a dealership?

It sounds to me like you have probably had water get into the siren.
Unfortunitly this would mean you will have to get a new siren instilled to fix the problem.
Of course there could be another reason though.

a normal horn will do as well.

what if i had tried to put a different horn on it and it did not work? how do i make it loud again?

????????????? 1 terminal has 12 volt, and the other has ground (which is switched by the control unit). Put a test light across the 2 terminals of the connector, and trigger the alarm. The test light must cycle on off on off ……. as the horn would be, then the circuit is OK.
So, now you can connect any type of horn you like.

I am an alarm specialist, if your alarm is aftermarket then remove the siren completely but disconnect the alarm fuses before you cut the wires or you'll short out the fuses, once you remove the siren, in the siren wire coil their should be 4-6 wires red, 12 volt, black, negative, green siren trigger !!!! , blue tamper switch, brown, white not connected. To save money all you have to do is connect the green wire to the siren wire and test the alarm system, find the siren wire under the dashboard, but you'll need to feed the green wire through the fire wall to get it under the dash.

Once you have connected it test it if the horn doesn't sound when you either lock the car or open a door in lock mode, then you need to connect one of the other wires and see which one the installer has actually used.

Once you find it the alarm should be reprogramed to discharge a horn tone instead of siren sound. This is as easy as starting a car, Good Luck !!!

ok after I have done all this how do I make it loud? do I have to take it to a alarm spec or somthing?

first of all, we need to establish if this is an OEM or "after market" system. I think, that the US has an OEM system.

The horn is aleady loud how loud do you want it to be as the horn can only emitt cetain decimals of volume.

its still the oem system
its just for some reason when I disconnected the chirp alarm to hook up the aftermarket one the aftermarket one didn't work. So I hooked up the oem on and now its not loud. its very quiet.

maybe you reversed the polarity ????

Sounds as though you have damaged the siren, replace with a new one and you will find that the problem will disappear. If this fails get back to me