GM Service Manual Online
For 1990-2009 cars only
Battery 1: The scan tool displays the battery voltage in volts.

First Alarm Activation: The scan tool displays the cause of the first alarm event of the content theft deterrent system.

Horn Relay Command: The scan tool displays the command state of the horn relay

Second Alarm Activation: The scan tool displays the cause of the second alarm event of the content theft deterrent system.

Theft System Status: The scan tool displays the status of the content theft system.

Third Alarm Activation: The scan tool displays the cause of the Third alarm event of the content theft deterrent system.