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Home >> Subaru >> 2023 >> Ascent Limited >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Immobilizer System (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC B1403: Immobilizer Sub Control Module Collation

DTC B1403: Immobilizer Sub Control Module Collation

Diagnosis start condition: 

DTC detecting condition: 

Reference code incompatibility between immobilizer control module and central gateway control module

Trouble symptom: 

CAUTION: When the central gateway control module is replaced, registration of the immobilizer system is required. For details, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.
  1. REGISTRATION OF CENTRAL GATEWAY CONTROL MODULE  .

    Perform the central gateway control module registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.

    Is registration complete?

    Yes:  Currently, it is normal. (Registration of central gateway control module was not completed.)

    No:  Refer to "Correspondence table when registration is not possible" in the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume. If the registration still does not work properly, replace the central gateway control module. Ref. to SECURITY AND LOCKS>CENTRAL GATEWAY CONTROL MODULE .