Friday, February 26, 2021

2010 Cadillac Truck SRX AWD V6-3.0L Page 1630

2010 Cadillac Truck SRX AWD V6-3.0L Page 1630



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



of P-codes.



Perform the ECM immobilizer learn using the Engine Control Module IMMO Learn function 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 password 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



P0634



DTC P0634



Diagnostic Instructions



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



Check - Vehicle) prior to using this diagnostic procedure.



* 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 P0634



- Transmission Control Module (TCM) Overtemperature



Circuit/System Description

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