GM Service Manual Online
For 1990-2009 cars only
Lockout Timer Status:  The duration of time the system remains in tamper mode The VTD system will disable sampling of the key code for 10 minutes when a tamper is detected.

Auto-Learn Timer Status: The duration of time the system remains in the re-learn wait mode.

Door Ajar Switches: The scan dool displays the door ajar input from any of the vehicle doors. The scann tool displays OPEN when any vehicle door is ajar.

Seed & Key Timer Status: The scan tool displays the time in seconds used by the BCM to learn a valid code from the passlock sensor. The learn procedure consists of 3 seperate periods.

Key Cylinder Unlock: The scan tool displays the input from the drivers door key cylinder. The scan tool displays ON when the key cylinder is in the unlock position.

Passlock Data Voltage: Displays the voltage data from the Passlock Sensor to the BCM. The BCM determines if the data received is valid or invalid.

Security Lamp State: Indicates the state of the SECURITY indicator either on, off or flashing.

His DTC Cyc. Counts.: Displays the number of key cycles that have occured in order to clear history DTCs.

PCM/VCM in VTD Fail Enable: The scan tool displays which state the Powertrain Control Module (PCM) is currently in for the Vehicle Theft Deterrent (VTD).

VTD Fuel Disable: The scan tool displays the state of which the fuel delivery system is in.

VTD Auto Learn Timer: The scan tool displays which state the learn timer for the VTD is currently in.

VTD Fuel Disable Until Ign. OFF: The scan tool display the state of which the fuel delivery system is in according to the ignition switch position.