Tuesday, August 3, 2021

2010 Cadillac Truck SRX FWD V6-3.0L Page 732

2010 Cadillac Truck SRX FWD V6-3.0L Page 732



* 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 B3902 00



- Incorrect Immobilizer Identifier Received



Circuit/System Description



When certain modules are programmed and configured during installation, the module learns a specific environment identifier which is unique to



the vehicle. The environment identifier is used to prevent the swapping modules between vehicles. The body control module (BCM) is the keeper



of the environment identifier. The instrument cluster, electronic brake control module (EBCM), HVAC control module, sensing and diagnostic



module (SDM), engine control module (ECM), and steering column lock control module, if equipped, each learn the environment identifier during



their configuration process. During vehicle operation, each of these modules compare their environment identifier to that of the BCM. If the



identifiers match, vehicle starting is allowed. If an environment identifier does not match, vehicle starting is disabled.



Conditions for Running the DTC



Ignition is in the ACCESSORY or RUN position.



Conditions for Setting the DTC



The control module's environment identifier does not match the environment identifier stored by the BCM.



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 will be cleared when the module learns a correct environment identifier.



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



Perform the Programming and Setup procedure for the control module that set DTC B3902. Verify the DTC does not reset after programming.

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