GM Service Manual Online
For 1990-2009 cars only
Generator F Terminal: The scan tool displays 0-100 percent. The Generator F Terminal is an input to the PCM which indicates the percentage of total capacity that the generator is producing.

Generator L Terminal: The scan tool displays Active or Inactive. The PCM applies ignition voltage to the Generator L Terminal to start the charging process. When the generator is at operating speed and producing voltage the scan tool displays Active.

Theft Deterrent State: The scan tool displays the current theft deterrent state. This data represents what theft deterrent functional mode the BCM is in. The BCM enters different states based upon information received from various inputs associated with the theft deterrent system.

VTD Fuel Disable: The scan tool displays ON/OFF. The scan tool displays ON when the Vehicle Theft Deterrent (VTD) is active.