Anti theft (alarm) does not arm

I have a 1997 Nissan Maxima that I bought from a guy. It is a really nice car. Everything works perfect exect the alarm. When I lock all doors, and lock the car, nothing happens. The security light just keeps blinking. It does not stay steady for 30 seconds like its supposed to. Can anyone help me? Thanks

Try this, lock your doors with the windows down. Do this with the doors open, lock it, then shut the door. Watch the light. After about 45 seconds, open a door by reaching in the vehicle. If nothing happens, make sure your door switches are turning on the interior lights.

Let me know what happens. :smokin: