Saturday, February 22, 2020

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1402

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1402



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions)provides an overview of each diagnostic category.



DTC Descriptor



DTC P0513



- Immobilizer Key Incorrect



Circuit/System Description



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.



Conditions for Running the DTC



Ignition is in the ACCESSORY or RUN position.



Conditions for Setting the DTC



The calculated response from the BCM does not equal the calculation performed by the ECM.



Action Taken When the DTC Sets



* The security indicator in the instrument cluster will illuminate.



* Vehicle starting will be disabled.



Conditions for Clearing the DTC



* 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.



Diagnostic Aids



The key referenced in the DTC descriptor does not refer to the vehicle key. In this case, key is referring to the challenge response.



Reference Information



Schematic Reference



Immobilizer Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Immobilizer



Schematics)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)



Description and Operation



Immobilizer Description and Operation (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description and



Operation/Immobilizer)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information



Circuit/System Verification



Note: Because of normal system communications between the BCM and ECM, any immobilizer B-codes must be diagnosed prior to the diagnosis

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