Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides and overview of each diagnostic category. |
DTC Descriptor
DTC B3031: Security System Controller In Learn ModeCircuit/System Description
When learning a vehicle key, the body control module (BCM) is placed in learn mode. DTC B3031 will set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the coded key is learned, learn mode will be exited and the DTC cleared. If the BCM does not exit learn mode, B3031 will remain current and indicate a fault.
Conditions for Running the DTC
The immobilizer system is in learn mode.
Conditions for Setting the DTC
DTC B3031 will set any time the BCM enters learn mode.
Action Taken When the DTC Sets
The security indicator will illuminate.
Conditions for Clearing the DTC
| • | A current DTC will be cleared upon the successful exit of learn mode. |
| • | A history DTC will be cleared after 100 malfunction-free ignition cycles. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Immobilizer Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Important: When performing a 10 Minute Relearn Procedure, all keys not learned at that time will be erased and not be recognized. Perform the Adding Keys procedure on all keys or instruct the customer how to perform the Adding Keys procedure should all vehicle keys not be present at the time of repair.
- Verify DTC B3055 is not set as current.
- Perform the 10 Minute Vehicle Key Relearn procedure. Refer to Replacing Keys . The BCM should exit learn mode and DTC B3031 should clear.
| ⇒ | If DTC B3055 is set as current, refer to DTC B3055 . |
| ⇒ | If the BCM does not exit learn mode, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup, and programming
