Friday, January 28, 2022

2010 Cadillac Truck SRX FWD V6-3.0L Page 1891

2010 Cadillac Truck SRX FWD V6-3.0L Page 1891



Conditions for Running the DTC



The ECM is in learn mode.



Conditions for Setting the DTC



The ECM has not learned a security code.



Action Taken When the DTC Sets



The security indicator in the instrument cluster will illuminate.



Conditions for Clearing the DTC



* A current DTC P1649 will be cleared upon a successful engine start after exit of learn mode.



* 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



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)



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



of P-codes.



Perform the ECM immobilizer learn using the Engine Control Module IMMO Learn in SPS. Refer to Immobilizer System Component



Programming (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Testing and Inspection/Programming and Relearning). The



ECM should successfully complete the learn and the vehicle should start.



If the ECM does not complete the learn or vehicle starting remains disabled, replace the K20 Engine Control Module.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



Control Module References (See: Testing and Inspection/Programming and Relearning)for ECM replacement, setup, and programming



P1682



DTC P1682



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

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