Subaru Legacy BN/BS (2015-2019) Service Manual: List of diagnostic trouble code (dtc) list

Subaru Legacy BN/BS (2015-2019) Service Manual / Immobilizer (diagnostics) / List of diagnostic trouble code (dtc) list

NOTE:

If DTCs irrelevant to the immobilizer are detected, perform diagnosis according to the DTCs irrelevant to the immobilizer first.

1. ECM

DTC	Item	Note
B1570	ANTENNA	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1570 ANTENNA
B1571	REFERENCE CODE INCOMPATIBILITY (IMMOBILIZER CM TO ECM)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1571 REFERENCE CODE INCOMPATIBILITY (IMMOBILIZER CM TO ECM)
B1572	IMM CIRCUIT EXCEPT ANTENNA CIRCUIT	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1572 IMM CIRCUIT EXCEPT ANTENNA CIRCUIT
B1574	KEY COMMUNICATION	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1574 KEY COMMUNICATION
B1575	INCORRECT IMMOBILIZER KEY	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1575 INCORRECT IMMOBILIZER KEY
B1576	EGI CONTROL MODULE EEPROM	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1576 EGI CONTROL MODULE EEPROM
B1577	IMM CONTROL MODULE EEPROM	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1577 IMM CONTROL MODULE EEPROM
B1578	METER	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1578 METER

2. BODY INTEGRATED UNIT

NOTE:

Except for C0 and C5 models

DTC	Item	Note	Relation between ECM and DTC
B1401	METER COLLATION	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1401 METER COLLATION	B1578
B1402	IMMOBILIZER KEY COLLATION	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1402 IMMOBILIZER KEY COLLATION	B1575
B1407	MET COMMUNICATION	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1407 MET COMMUNICATION	B1578
B1408	METER NON-VOLATILE MEMORY	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1408 METER NON-VOLATILE MEMORY	B1578
B1410	TRANSPONDER COMMUNICATION	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1410 TRANSPONDER COMMUNICATION	B1574
B1411	IMMOBILIZER ANTENNA	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1411 IMMOBILIZER ANTENNA	B1570

NOTE:

The starter relay control is performed in immobilizer system. When the body integrated unit detects a nonconformity of reference code, it immediately outputs a starter relay cut signal to ECM, and then ECM stops the starter relay operation. In this case, engine does not start, and DTC is not recorded in ECM. Check that the engine does not start on the DTC of body integrated unit.

3. IMMOBILIZER CM

NOTE:

For C0 and C5 models

DTC	Item	Note	Relation between ECM and DTC
B1402	IMMOBILIZER KEY COLLATION	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1402 IMMOBILIZER KEY COLLATION	B1575
B1410	TRANSPONDER COMMUNICATION	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1410 TRANSPONDER COMMUNICATION	B1574
B1411	IMMOBILIZER ANTENNA	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1411 IMMOBILIZER ANTENNA	B1570
B1412	IMMOBILIZER CONTROL MODULE CAN REGISTER STUCK	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1412 IMMOBILIZER CONTROL MODULE CAN REGISTER STUCK	—
B1413	IMMOBILIZER CONTROL MODULE BATTERY POWER SUPPLY	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1413 IMMOBILIZER CONTROL MODULE BATTERY POWER SUPPLY	—
B1414	IMMOBILIZER CONTROL MODULE NON-VOLATILE MEMORY	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1414 IMMOBILIZER CONTROL MODULE NON-VOLATILE MEMORY	B1577

NOTE:

The starter relay control is performed in immobilizer system. When the immobilizer CM detects a nonconformity of reference code, it immediately outputs a starter relay cut signal to ECM, and then ECM stops the starter relay operation. In this case, engine does not start, and DTC is not recorded in ECM. Therefore, check DTC for the immobilizer CM to identify the cause of the engine not starting.

Inspection mode procedure

It is possible to diagnose the DTC by performing the indicated inspection mode. After correcting the DTC, perform a necessary inspection mode and make sure that the function is resumed correctly and t ...

Read diagnostic trouble code (dtc) operation

NOTE:• For detailed operation procedures, refer to “Application help”.• For details concerning DTC, refer to List of Diagnostic Trouble Code (DTC). List of Diagnostic Trouble ...

Other materials:

List of cancel code list
CodeItemContents of diagnosisB2320REAR RADAR LOW VOLTAGE (LESS THAN 9 V)Temporarily stops because the voltage supplied to radar drops to or below 9 V. Returns to normal when the voltage becomes normal.B2321REAR RADAR HIGH VOLTAGE (MORE THAN 16 V)Temporarily stops because the voltage supplied to rada ...