how can i program it so it won't autoarm? i think its the 300hf. something like that

 

First of all, you need to find out the exact model number.

Second, Passive arming is a programmable feature of the alarm. Need to know where your programming (valet) switch is, or have access to a BitWriter to program that feature out.

 

exact model is 300ESP

 

And you know where programming switch is?

I'm assuming you do.

Open a door. Turn ignition on and off. Press and hold valet button once. After siren chirps once, press button one more time and release. Press once more and hold. Press button 2 on transmitter once. Siren should chirp twice. Turn ignition on and off or close the open door to exit programming mode.

Disclaimer. I provide this info free from liability, and I accept no responsibility if you press the button too many times and change other programming of your alarm.