Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2a0e mute line circuit

Subaru Legacy BN/BS (2015-2019) Service Manual / Telematics system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b2a0e mute line circuit

DIAGNOSIS START CONDITION:

When ignition switch is ON.

DTC DETECTING CONDITION:

The following conditions occur continuously after the ignition switch is turned to ON when DCM does not mute the audio or navigation system.

• Current in the mute line is less than 1 mA. (Improper line connection, etc.)

• Current is more than 50 mA for at least 50 ms. (Short-circuited line, etc.)

TROUBLE SYMPTOM:

• The mute function of audio or navigation system does not operate.

• RED LED illuminates.

WIRING DIAGRAM:

Telematics Telematics System > WIRING DIAGRAM

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 B2A0E displayed- (Current malfunction)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A0E MUTE LINE 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.CHECK HARNESS (OPEN CIRCUIT). 1) Turn the ignition switch to OFF. 2) Disconnect the audio or navigation connector. 3) Disconnect the DCM connector. 4) Measure the resistance between audio or navigation connector and DCM connector. Connector & terminal (i270) No. 19 — (i272) No. 8:	Is the resistance 1 - or less-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A0E MUTE LINE CIRCUIT	Repair or replace the open circuit of harness.
3.CHECK HARNESS (GROUND SHORT CIRCUIT). Measure the resistance between DCM connector and chassis ground. Connector & terminal (i270) No. 19 — Chassis ground:	Is the resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A0E MUTE LINE CIRCUIT	Repair or replace the open circuit of harness.
4.CHECK THE CONNECTOR (SHORT CIRCUIT TO POWER SUPPLY). Measure the voltage between DCM connector and chassis ground. Connector & terminal (i270) No. 19 (+) — Chassis ground (−):	Is the voltage less than 1 V-	Replace the DCM. Data Communication Module	Repair or replace the short circuit of the harness.

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Other materials:

Caution
1. SRS AIRBAG SYSTEMThe airbag system wiring harness is routed near the keyless access with push button start system.CAUTION:• Do not use the electrical test equipment on all airbag system wiring harnesses and connectors.• Be careful not to damage the wiring harness of the airbag system ...