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 engine control module (ECM), via the serial data circuit. The vehicle theft deterrent (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 IPC to flash the SECURITY indicator.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1016 Vehicle Identification Number (VIN) Information Not Programmed
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 sends a message to the IPC to flash 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 manufacturers enable counter (MEC) is equal to 0, the VIN information cannot be changed.
Test Description
The number below refers to the step number on the diagnostic table:
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Theft Deterrent System Schematics Connector End View Reference: Theft Deterrent System Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 | Has the theft deterrent control module been replaced in this vehicle? | Go to Step 3 | Go to Step 4 |
Has the Setup New VTD Module procedure been performed? | Go to Step 4 | ||
4 |
Important: If a 10 Minute or 30 Minute Re-Learn Procedure is performed, all keys not learned at that time will be erased and will not be recognized. Perform the Adding Keys procedure on all keys or instruct the customer how to perform the Adding Keys procedure. Refer to Adding Keys . Replace the theft deterrent control module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 5 | -- |
5 |
Does the DTC reset? | Go to Step 1 | System OK |
