B1015

DTC B1015

CIRCUIT DESCRIPTION
After a loss of battery power has been restored the theft deterrent control module will perform a check on the stored vehicle identification number (VIN). If the VIN is CORRECT, the theft deterrent control module will run the VIN Timer for a programmable length of time, typically 10 minutes. The theft deterrent control module will send a message via the serial data circuit to the instrument panel cluster (IPC) to illuminate the SECURITY indicator. After the VIN Timer has timed out, the security indicator will turn OFF. If the VIN is INCORRECT, the theft deterrent control module will send the fuel disable password to the ECM via the serial data circuit. The VTD system considers this to be a tamper and will not allow the vehicle to start. The theft deterrent control module will send a message via the serial data circuit to the instrument panel cluster (IPC) to flash the SECURITY indicator.

CONDITIONS FOR RUNNING THE DTC
The ignition is ON.

CONDITIONS FOR SETTING THE DTC
- The VIN check flag of the theft deterrent control module is true.
- The theft deterrent control module has determined that the battery has been reconnected after a disconnect.

ACTION TAKEN WHEN THE DTC SETS
- The vehicle will not start.
- The theft deterrent control module sends the fuel disable message via the serial data circuit to the ECM.
- The theft deterrent control module will run the VIN Timer for a programmable length of time, typically 10 minutes.
- The theft deterrent control module sends a message to the instrument panel cluster (IPC) to illuminate the SECURITY indicator.

CONDITIONS FOR CLEARING THE MIL/DTC
- The Theft Deterrent control module clears the current DTC when the correct VIN information is present.
- The DTC can be cleared by using a scan tool.

DIAGNOSTIC AIDS
The VIN information is stored during the Setup New VTD Module procedure on a GM SPO replacement part. When the manufactures enable counter (MEC) is equal to 0 the VIN information cannot be changed.

TEST DESCRIPTION

Steps 1-3:

The number below refers to the step number on the diagnostic table:
2. If DTC B1015 or B1016 are set as a current code, the VIN information was either incorrectly stored or not stored. The VIN information is stored during the Setup New VTD Module procedure on a GM SPO replacement part. When either the Setup New VTD Module procedure has been performed or when the manufactures enable counter (MEC) is equal to 0 the VIN information cannot be changed.