DTC B3976
Diagnostic Instructions
DTC Descriptor
DTC B3976 00: Unconfigured Transponder
Circuit/System Description
When an ignition key is inserted into the transmitter slot and the ignition mode is changed, the transponder embedded in the head of the key is energised by the exciter coils surrounding the ignition lock cylinder. The energised transponder transmits a signal that contains its unique value, which is received by the body control module (BCM). The BCM then compares this value to a value stored in memory. If the value is not correct, the BCM disables engine start.
Conditions for Running the DTC
| • | Ignition is in the Accessory or Run position. |
| • | The BCM is in the learn coded key state. |
Conditions for Setting the DTC
The BCM has determined the current key is not configured as a proper vehicle key.
Action Taken When the DTC Sets
| • | Vehicle starting will be disabled. |
| • | The security indicator in the instrument cluster will be illuminated. A service message will be displayed in the driver information centre. |
Conditions for Clearing the DTC
| • | A current DTC will be cleared when the BCM detects a properly configured vehicle key. |
| • | A history DTC will be cleared after 100 malfunction-free ignition cycles or when a scan tool is used to clear DTCs. |
Reference Information
Schematic Reference
Immobiliser Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Immobiliser Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Verify the engine starts with each available key.
| ⇒ | If the engine does not start with a key
|
| ⇓ | If the engine starts with all keys
|
- All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Key with Integrated Transmitter Programming
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