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DTC P1649Diagnostic Instructions
DTC DescriptorDTC P1649: Immobilizer Security Code Not ProgrammedCircuit/System DescriptionWhen learning the security code, as well as the challenge and response sequence, the engine control module (ECM) is placed in learn mode. Once the security code and challenge/response are learned, learn mode will be exited when the engine is successfully started. Conditions for Running the DTCThe ECM is in learn mode. Conditions for Setting the DTCThe ECM is not programmed. Action Taken When the DTC SetsThe security indicator in the instrument cluster will illuminate. Conditions for Clearing the DTC
Reference InformationSchematic ReferenceConnector End View ReferenceDescription and OperationImmobilizer Description and Operation Electrical Information ReferenceScan Tool ReferenceControl Module References for scan tool information Circuit/System VerificationNote: 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 Immobilizer Relearn procedure. Refer to Immobilizer System Component Programming .
Repair InstructionsPerform the Diagnostic Repair Verification after completing the diagnostic procedure.
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