84 300SD alarm goes off automatically

I am not sure why, but generally at night the horn will blow in short blasts for about 30 seconds. Then it stops.
Is there a way to see what is happening here?
Thanks Pal
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<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> Check the switches (door, hood, trunk).&nbsp; The hood switch is close to battery and it may develop corrosion. <p>Pal wrote:<blockquote TYPE=CITE>I am not sure why, but generally at night the horn will blow in short blasts <br>for about 30 seconds. <br>Then it stops. <p>Is there a way to see what is happening here?<br>Thanks <br>Pal</blockquote> </html>
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