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• | 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 an overview of each diagnostic category. |
The body control module (BCM) sends the pre-release information to the engine control module (ECM) via the serial data circuit. The ECM then sends a challenge to the BCM. Both the ECM and BCM perform a calculation on this challenge. If the calculated response from the BCM equals the calculation performed by the ECM, the ECM will allow vehicle starting.
Ignition is in the ACCESSORY or RUN position.
The calculated response from the BCM does not equal the calculation performed by the ECM.
• | The security indicator in the instrument cluster will illuminate. |
• | Vehicle starting will be disabled. |
• | A current DTC P0513 will be cleared when a valid calculation is received. |
• | A history DTC will be cleared after 40 malfunction-free ignition cycles or when a scan tool is used to clear DTCs. |
The key referenced in the DTC descriptor does not refer to the vehicle key. In this case, key is referring to the challenge response.
Immobiliser Description and Operation
Control Module References for scan tool information
Note: Because of normal system communications between the BCM and ECM, any immobiliser DTCs set in the BCM must be diagnosed prior to the diagnosis immobiliser DTCs set in the ECM.
If the BCM does not successfully learn or the engine does not start
Perform the ECM immobiliser learn using the Engine Control Module IMMO Learn in SPS. Refer to Immobiliser System Component Programming .
If the vehicle starts
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