Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b1571 reference code incompatibility (immobilizer cm to ecm)

Subaru Legacy BN/BS (2015-2019) Service Manual / Keyless access with push button start system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b1571 reference code incompatibility (immobilizer cm to ecm)

DTC DETECTING CONDITION:

Incompatibility of reference code between keyless access CM (model without ID code box) or ID code box (model with ID code box) and ECM occurs.

TROUBLE SYMPTOM:

Engine will not start.

CAUTION:

For replacement procedure of keyless access CM, ECM and ID code box, refer to “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

STEP	CHECK	YES	NO
1.CHECK ECM. Perform ECM registration. Refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.	Is ECM registration finished- And does the engine start-	ECM registration was not performed properly.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1571 REFERENCE CODE INCOMPATIBILITY (IMMOBILIZER CM TO ECM)
2.REPLACE ECM. 1) Install the ECM from other normal operating vehicle (with push button start) which use same ECM to the vehicle to be diagnosed. 2) Perform ECM registration. Refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.	Is ECM registration finished- And does the engine start-	Replace the ECM. Engine Control Module (ECM) > REMOVAL Engine Control Module (ECM) > REMOVAL Install the ECM from other vehicle to the original vehicle.	Replace Keyless access CM (model without ID code box), Keyless Access CM or replace ID code box (model with ID code box). ID Code Box > NOTE

Dtc b2793 back up power

DTC DETECTING CONDITION:When a fault occurs in +B2 power input for the keyless access CM.TROUBLE SYMPTOM:NoneCAUTION:For replacement procedure of keyless access CM, refer to the “REGISTRATION MA ...

Dtc b1577 imm control module eeprom

1. EXCEPT FOR C0 AND C5 MODELSDTC DETECTING CONDITION:• Defective keyless access CM• When inaccessible to ROM in keyless access CM.TROUBLE SYMPTOM:Engine will not start.CAUTION:For replace ...

Other materials:

Dtc b1612 front sub sensor rh lost communication
DIAGNOSIS START CONDITION:Ignition voltage is 10 V to 16 V.DTC DETECTING CONDITION:Front sub sensor RH communication error (open/short circuit or connector connection failure between airbag CM and sensor, sensor internal communication circuit failure, CM internal communication circuit failure)CAUTIO ...