Is the regular horn the same as alarm horn

What is your question?

This is my sons car I won't be able to get to see him for 3 days. He needs to drive the car but someone tried to break into it and messed the door up where you put in the key. I want to tell him how to unhook the horn that blows when the alarm is set off so he can get to work this week he will be home sat I assume I could just cut the line that goes to the horn