Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b1577 imm control module eeprom

Subaru Legacy BN/BS (2015-2019) Service Manual / Immobilizer (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b1577 imm control module eeprom

DIAGNOSIS START CONDITION:

• Battery voltage is 10 V or more.

• The remote engine starter was not used to start the engine.

DTC DETECTING CONDITION:

• Defective body integrated unit (except for C0 and C5 models) or immobilizer CM (C0 and C5 models)

• Failed to access ROM in the body integrated unit (except for C0 and C5 models) or the immobilizer CM (C0 and C5 models)

TROUBLE SYMPTOM:

• Engine will not start.

• The security indicator illuminates.

CAUTION:

When the body integrated unit (except for C0 and C5 models) or the immobilizer CM (C0 and C5 models) is replaced, registration of the immobilizer system is required. For details, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

STEP	CHECK	YES	NO
1.PERFORM ECM REGISTRATION. Perform ECM registration. Refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.	Is registration complete-	Finish the diagnosis.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1577 IMM CONTROL MODULE EEPROM
2.PERFORM ECM REGISTRATION. 1) Perform the Clear Memory Mode. (ECM and immobilizer CM) Clear Memory Mode 2) Perform ECM registration. Refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.	Is registration complete-	Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.	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 following parts. Body integrated unit (except for C0 and C5 models) Body Integrated Unit Immobilizer CM (C0 and C5 models) Immobilizer Control Module

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