[AWP9521]

If using the remote transmitter to arm the alarm does the horn still beep once when the light does not work? If unsure try this test.

Next time you notice that the light is not working, test the alarm system to see if it is still operational, roll down a window and lock the doors using the power lock switch or the remote transmitter, wait for a little more than minute for the system to arm and then reach in and open the door from the inside and see if it sets off the alarm. If the alarm still works then all you might need to do is replace the light on the dash, if it doesn't work then the problem might go a little deeper than just the light.