Arm the alarm and remove battery cable to see if siren goes off if not internal battery in siren maybe dead. Don't know much about alarm system except to know siren will go off if battery cable removed when it is armed if internal battery charged up.I am giving the car to my son tomorrow for his birthday. I have fix almost all the problems with the car, except the keyless remote.
I turned off the alarm and remote about 2 years ago with the little key.
The car sat for 9 months without a battery in it after the valves and pistons hit.
I turned the alarm on in the trunk and nothing seems to work. No red light when I lock the car and the doors do not lock with either key fob. Both key fobs do blink when I press the button.