DTC B1271
DTC B1271 |
Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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DTC Descriptor |
DTC B1271 00
Theft Protection Active
Circuit/System Description |
When the radio is initially installed in the vehicle, the radio receives VIN information via serial data. The radio stores a portion of the VIN and compares this sequence to the VIN information received each time the radio powers on. The VIN in the radio is a single one-time learn.
The radio theft deterrent system is intended to disable or limit radio functionality if incorrect vehicle information is received by the radio. The radio disables functionality if the VIN information received by the radio does not match the VIN information that has been learned by the radio. This DTC is generated by the module when the Theft Protection is activated.
Conditions for Running the DTC |
This DTC test runs when the radio changes from OFF to ON.
Conditions for Setting the DTC |
The radio has learned a correct VIN sequence and the VIN information received via serial data does NOT match the learned VIN sequence.
Action Taken When the DTC Sets |
The radio may be disabled or have limited functionality. The radio display will indicate that theft protection is active.
Conditions for Clearing the DTC |
The radio receives the correct VIN information via serial data.
Diagnostic Aids |
A possible cause of incorrect VIN info could be the radio was originally installed in another vehicle.
Reference Information |
Schematic Reference
Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Radio/Audio System Description and Operation
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification |
If this DTC is retrieved as a current DTC, replace the radio.
Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for radio replacement, setup, and programming