Circuit Description
This DTC is generated by the module when the theft lock is activated. This occurs when the VIN as received over the class 2 communication circuit and the vehicle identification number (VIN) as stored in the module memory do not match. This also occurs when no VIN is received over the class 2 circuit. The only circuit required is the class 2 communications line.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1271 Theft Locked
Conditions for Running the DTC
This test is run every 300 milliseconds.
Conditions for Setting the DTC
This DTC is generated by the module when the VIN as received over the class 2 communication circuit and the VIN as stored in the module memory do not match. This also occurs if no VIN is received over the class 2 circuit. This DTC test runs when the radio changes from OFF to ON.
Action Taken When the DTC Sets
The radio does not function. The radio will display Locked -- THEFTLOCK Active.
Conditions for Clearing the MIL/DTC
Re-calibration with the correct calibrations for the vehicle and cycling the radio to OFF then to ON will clear the DTC if there is no damage to the radio.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the DTC Reset? | Go to Step 3 | System OK |
3 | Replace the radio. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | System OK | -- |
