Subaru Crosstrek Service Manual: Dtc b2a04 mic circuit

Diagnosis start condition:

When ACC is ON.

DTC detecting condition:

Any of the followings continues for 1 second or more.

• MIC impedance is more than 10 k?. (Detached MIC, etc.)

• MIC impedance is less than 10 ?. (Short-circuited MIC, etc.)

• Call function cannot be used.

• RED LED illuminates.

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

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

1.CHECK DTC.

Read the DTC. Diagnostic Code(s) Display">

Is DTC B2A04 displayed? (Current malfunction)

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A04 MIC CIRCUIT">Go to Step 2.

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 microphone connector.

3) Disconnect the DCM connector.

4) Measure the resistance between microphone connector and DCM connector.

Connector & terminal

With sunroof and without EyeSight

(R56) No. 7 — (i271) No. 14:
(R56) No. 8 — (i271) No. 8:
(R56) No. 9 — (i271) No. 6:

Without sunroof and without EyeSight

(R56) No. 4 — (i271) No. 14:
(R56) No. 5 — (i271) No. 8:
(R56) No. 6 — (i271) No. 6:

With EyeSight

(R405) No. 4 — (i271) No. 6:
(R405) No. 3 — (i271) No. 8:
(R405) No. 5 — (i271) No. 14:

Is the resistance 1 ? or less?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A04 MIC CIRCUIT">Go to Step 3.

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. 8 — Chassis ground:
(i271) No. 14 — Chassis ground:
(i271) No. 6 — Chassis ground:

Is the resistance 1 M? or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A04 MIC CIRCUIT">Go to Step 4.

Repair or replace the short circuit of the harness.

4.CHECK THE CONNECTOR (SHORT CIRCUIT TO POWER SUPPLY).

Measure the voltage between DCM connector and chassis ground.

Connector & terminal

(i271) No. 8 (+) — Chassis ground (−):
(i271) No. 14 (+) — Chassis ground (−):
(i271) No. 6 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A04 MIC CIRCUIT">Go to Step 5.

Repair or replace the short circuit of the harness.

5.CHECK MICROPHONE.

Confirm the microphone voice input.

Is the voice input OK?

Replace the DCM. Data Communication Module">

Replace the microphone. Microphone">

Dtc b2a03 gps antenna circuit

Dtc b2a05 left speaker/audio circuit

Other materials:

Dtc u0151 lost communication with restraints control module
TELEMATICS SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC U0151 LOST COMMUNICATION WITH RESTRAINTS CONTROL MODULEDetected when CAN data is not received from airbag CM.NOTE:Perform the diagnosis for LAN system. Basic Diagnostic Procedure > PROCEDURE"> ...

Front seats
WARNING Never adjust the seat while driving to avoid loss of vehicle control and personal injury. Before adjusting the seat, make sure the hands and feet of rear seat passengers and cargo are clear of the adjusting mechanism. After adjusting the seat, push it slightly to make sur ...

Airflow mode selection
To select the airflow mode: Type A, B and C: Turn the airflow mode selection dial. Type D: Press the airflow mode selection button. To select the defrost mode: Type A and B: Turn the airflow mode selection dial. Type C and D: Press the defroster button. Airflow modes are as follows. ...