GM Service Manual Online
For 1990-2009 cars only
Auto. Learn Counter: The scan tool displays 0-3. The scan tool displays the current state of the Auto. Learn Timer Counter. The Auto. Learn Counter must increment a total of three times in order for the relearn procedure to be complete.

Auto. Learn Timer: The scan tool displays 0-10 Minutes. The scan tool displays the current state of the Auto. Learn Timer which increments in 10 second intervals. The Auto. Learn Timer must time out 3 times in order for the relearn procedure to be complete.

Fail Enable Counter: The scan tool displays 0-255. The scan tool displays the number of ignition cycles the VTD system has been in the fail enable state.

First Key Flag: The scan tool displays On/Off. The scan tool displays On when the VTD system is ready to learn the first key transponder value.

Left Rear Door Ajar Switch: The scan tool displays the position of the left rear door. The scan tool will display Ajar when to door is open.

LF Door Ajar Switch: The scan tool displays the position of the left front door. The scan tool will display Ajar when to door is open.

LF Key Cylinder Lock Switch: The scan tool displays the status of the LF door key switch. The scan too will display Idle/Lock/Unlock/Invalid depending on the positionof the LF key cylinder.

No. of Learned Key Codes: The scan tool displays 1-10. The scan tool displays the number of transponder values learned by the VTD system.

Passkey Power Mode: The scan tool displays On/Off. The scan tool displays ON when the BCM is commanding the theft deterrent exciter ON.

Right Rear Door Ajar Switch: The scan tool displays the position of the right rear door. The scan tool will display Ajar when to door is open.

RF Door Ajar Switch: The scan tool displays the position of the right front door. The scan tool will display Ajar when to door is open.

RF Key Cylinder Lock Switch: The scan tool displays the status of the RF door key switch. The scan too will display Idle/Lock/Unlock/Invalid depending on the positionof the RF key cylinder.

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

Tamper Flag: The scan tool displays On/Off. The scan tool displays On when the VTD system has read a key transponder value that has not been previously learned.

Vehicle Security Status: The scan tool displays Fuel Enabled/Fuel Disabled/Fuel Off for Ign/Learn Timer On/Fail Enable. The scan tool displays the current state of the vehicle theft deterrent (VTD) state.