How do i rest my dodge stratues rt 2004 alarm

If the battery was flattened, the horn is sounding because the immobilizer and alarm needs resetting.

anti-theft reset

https://www.google.com/search?q=2004+toyota+solara+anti+theft+reset

The safest order to attach the jumper cables is as follows:

1. Attach one red jumper cable clamp to the positive terminal on the dead battery.
2. Attach the other end of the same cable, the second red jumper cable clamp, to the positive terminal on the working (live) car battery.
3. Attach one black jumper cable clamp to the negative terminal of the working (live) car's battery.
4. Attach the other end of that cable, the second black jumper cable clamp, to an unpainted piece of stationary metal on the car with the dead battery. Do not attach this clamp to the negative terminal on the dead car's battery.

..

before you jump, put key in the ignition and turn to on (not start).

The Battery has gone flat. When you tried to jump start it, this did not change the battery state its still flat.
I bet you will get the same code on the scanner if you remove the battery. Take the battery out and charge it with a battery charger overnight, then try it again.

If the battery is dead when you jump it the alarm will sound. Pop the hood and put the jumper cables on first, then put the key in and start the car. this should turn the alarm off.

Remove the left rear tire and you can access the battery
..

Lets try step by step heck $600 you re-run a new horn. Open your hood, and take the fuse/relay box cover off. Press your horn listen for the relay to click in the box if the relay does not click then it is not triggering. take a paperclip and pull the horn relay and jumper 30 and 87 as seen on the bottom of the relay in its corresponding spots in the panel. Your horn should sound. The last time i ran across this problem was the steering coulmn did not have an adequate ground, checking that could be a simple check of jumper cable to the metal of the column and the battery ground.

Ive changed tons of resistors on this vehicle. If your vehicle blower works on high speed and not on the low ones these resistors go bad all the time. I dont have the information you are looking for but what i am saying is if you are having a problem with it and dont know if it is bad -chances are 95% it is. just get a new one

check remote batt..if that dont work unhook car batt for 24 hrs. should reset

Fit a NEW BATTERY -

Sounds like your Horn Relay is fried. That relay should be in the fuse box under the hood just pull it out and see if you can find a replacement directly from Saturn.