Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2a08 sos button circuit

Subaru Legacy BN/BS (2015-2019) Service Manual / Telematics system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b2a08 sos button circuit

DIAGNOSIS START CONDITION:

When ignition switch is ON.

DTC DETECTING CONDITION:

The following conditions occur for at least 50 ms.

• SOS button impedance is more than 10 k-.

• SOS button is stuck for at least 60 seconds.

TROUBLE SYMPTOM:

• SOS function cannot be used.

• RED LED illuminates.

WIRING DIAGRAM:

NOTE:

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

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 B2A08 displayed- (Current malfunction)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A08 SOS BUTTON 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 telematics button connector. 3) Disconnect the DCM connector. 4) Measure the resistance between telematics button connector and DCM connector. Connector & terminal (i270) No. 5 — (AD2) No. 6: (AD2) No. 1 — Chassis ground:	Is the resistance 1 - or less-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A08 SOS BUTTON 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 (i271) No. 4 — Chassis ground:	Is the resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A08 SOS BUTTON 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. 5 (+) — Chassis ground (−): (AD2) No. 1 (+) — Chassis ground (−):	Is the voltage less than 1 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A08 SOS BUTTON CIRCUIT	Repair or replace the short circuit of the harness.
5.CHECK THE SOS BUTTON UNIT. Measure the resistance of the SOS button unit. Connector & terminal (AD1) No. 6 — (AD1) No. 1:	Is the resistance 1 - or less when SOS button is ON, and 1.6 (±5%) k- or more when SOS button is OFF-	Replace the DCM. Data Communication Module	Replace the telematics button. Switches and Harness

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Procedure
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