Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2a05 left speaker/audio circuit

Subaru Legacy BN/BS (2015-2019) Service Manual / Telematics system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b2a05 left speaker/audio circuit

DIAGNOSIS START CONDITION:

When ACC is ON.

DTC DETECTING CONDITION:

Speaker impedance is more than 10 k- for 100 mS. (Detached speaker connection, etc.)

TROUBLE SYMPTOM:

• Call function cannot be used.

• RED LED illuminates.

WIRING DIAGRAM:

NOTE:

For the coupling connector, refer to “WIRING SYSTEM”.

Telematics Telematics System > WIRING DIAGRAM

• Without audio amplifier

• With audio amplifier

CAUTION:

CommCheck is required after replacing the DCM. Telematics System > OPERATION

STEP	CHECK	YES	NO
1.CHECK DTC. Read the DTC. Diagnostic Code(s) Display	Is DTC B2A05 displayed- (Current malfunction)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A05 LEFT SPEAKER/AUDIO CIRCUIT	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. In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
2.PERFORM THE SYSTEM OPERATION CHECK. Perform [Speaker ON] in the system operation check mode. System Operation Check Mode	Does it sound-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A05 LEFT SPEAKER/AUDIO CIRCUIT	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. In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
3.CHECK HARNESS (OPEN CIRCUIT). 1) Turn the ignition switch to OFF. 2) Disconnect the speaker connector and tweeter connector. 3) Disconnect the DCM connector. 4) Measure the resistance between speaker connector and tweeter connector and DCM connector. Connector & terminal Without audio amplifier (i271) No. 2 — (D12) No. 2: (i271) No. 2 — (i158) No. 1: (i271) No. 10 — (D12) No. 1: (i271) No. 10 — (i158) No. 3: With audio amplifier (i271) No. 2 — (i158) No. 3: (i271) No. 10 — (i158) No. 4:	Is the resistance 1 - or less-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A05 LEFT SPEAKER/AUDIO CIRCUIT	Repair or replace the open circuit of harness.
4.CHECK HARNESS (GROUND SHORT CIRCUIT). Measure the resistance between DCM connector and chassis ground. Connector & terminal (i271) No. 2 — Chassis ground: (i271) No. 10 — Chassis ground:	Is the resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A05 LEFT SPEAKER/AUDIO CIRCUIT	Repair or replace the open circuit of harness.
5.CHECK THE CONNECTOR (SHORT CIRCUIT TO POWER SUPPLY). Measure the voltage between DCM connector and chassis ground. Connector & terminal (i271) No. 2 (+) — Chassis ground (−): (i271) No. 10 (+) — Chassis ground (−):	Is the voltage less than 1 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A05 LEFT SPEAKER/AUDIO CIRCUIT	Repair or replace the short circuit of the harness.
6.CHECK THE SPEAKER. Perform the inspection of speaker unit and tweeter unit. Front Speaker Rear Speaker	Are the speaker and tweeter OK-	Replace the DCM. Data Communication Module	Replace the speaker and tweeter. Front Speaker Rear Speaker

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