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

Subaru Legacy BN/BS (2015-2019) Service Manual / Keyless access with push button start system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b1577 imm control module eeprom

1. EXCEPT FOR C0 AND C5 MODELS

DTC DETECTING CONDITION:

• Defective keyless access CM

• When inaccessible to ROM in keyless access CM.

TROUBLE SYMPTOM:

Engine will not start.

CAUTION:

For replacement procedure of keyless access CM, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

STEP	CHECK	YES	NO
1.CHECK DTC. 1) Turn the ignition switch to ON. 2) Perform the clear memory operation of ECM. Clear Memory Mode Clear Memory Mode 3) Turn the ignition switch to OFF. 4) Remove and install the battery. 5) Turn the ignition switch to ON. 6) After 5 seconds or more, read DTC. Read Diagnostic Trouble Code (DTC)	Is B1577 displayed-	Replace the keyless access CM. Keyless Access CM	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.

2. FOR C0 AND C5 MODELS

DTC DETECTING CONDITION:

• ID code box malfunction

• When inaccessible to ROM in ID code box.

TROUBLE SYMPTOM:

Engine will not start.

CAUTION:

For replacement procedure of ID code box, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

STEP	CHECK	YES	NO
1.CHECK DTC. 1) Turn the ignition switch to ON. 2) Perform the clear memory operation of ECM. Clear Memory Mode Clear Memory Mode 3) Turn the ignition switch to OFF. 4) Register the ID code box. Refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume. 5) Read the DTC again. Read Diagnostic Trouble Code (DTC)	Is B1577 displayed-	Replace the ID code box. ID Code Box	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.

Dtc b1571 reference code incompatibility (immobilizer cm to ecm)

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