GM Service Manual Online
For 1990-2009 cars only
Theft Data: Displays the voltage data from the Passkey Sensor to the BCM.

Lockout Timer:  The duration of time the system remains in tamper mode The VTD system will disable sampling of the key code for 3 minutes when a tamper is detected.

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

Seed and Key Timer: 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 separate periods.

Passkey Data Voltage: Displays the voltage data from the Passkey 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 or Off.

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

PCM/VCM in VTD Fail Enable: The scan tool displays Yes/No. The scan tool displays Yes when in fail enable. This indicates a failure has occurred in the VTD system.

VTD Fuel Disable: The scan tool displays Active/Inactive. The scan tool displays Active when the PCM has received a disable password from the BCM.

VTD Auto. Learn Timer: The scan tool displays Active/Inactive. The scan tool displays the current state of the Auto. Learn Timer, which must time out 3 times in order for the relearn procedure to be complete.

VTD Fuel Disable Until Ign. Off: The scan tool displays Yes/No. The scan tool displays Yes when the PCM has received the fuel disable password from the BCM. This indicates the PCM will not allow fuel delivery until the ignition is switched off prior to another start attempt.