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Home >> Subaru >> 2023 >> Outback Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Telematics System (Diagnostics) >> Diagnostics with Phenomenon >> Inspection >> Phone Conversation Is Not Possible. (The Microphone Does Not Respond To A Voice. No Sound Is Heard From The Speaker.)

Phone Conversation Is Not Possible. (The Microphone Does Not Respond To A Voice. No Sound Is Heard From The Speaker.)

Probable cause: 

Microphone malfunction, speaker malfunction, DCM malfunction

Wiring diagram: 

Telematics Ref. to WIRING SYSTEM>TELEMATICS SYSTEM>WIRING DIAGRAM .

G16391250Courtesy of SUBARU OF AMERICA, INC.
CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to TELEMATICS SYSTEM (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .
  1. CHECK DTCS  .
    1. Turn the ignition switch to ON.
    2. Read the DTC of [Telematics] using the Subaru Select Monitor. Ref. to TELEMATICS SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are DTCs B2A04, B2A05, B2A06 displayed?

    Yes  : Perform the diagnosis for the displayed DTC B2A04, B2A05, or B2A06. Ref. to TELEMATICS SYSTEM (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B2A04 MIC CIRCUIT . Ref. to TELEMATICS SYSTEM (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B2A05 LEFT SPEAKER/AUDIO CIRCUIT . Ref. to TELEMATICS SYSTEM (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B2A06 RIGHT SPEAKER/AUDIO CIRCUIT .

    No  : Go to  2.

  2. CHECK THE SPEAKER OPERATION  .

    Using the Subaru Select Monitor, check the following items in the [Active Test] of [Telematics]. Ref. to TELEMATICS SYSTEM (DIAGNOSTICS)>ACTIVE TEST .

    • Speaker ON

    Does it sound?

    Yes  : Go to  4.

    No  : Go to  3.

  3. CHECK THE SPEAKER  .
    1. Turn the ignition switch to OFF.
    2. Using a tester, measure the internal resistance of each speaker.

    Terminals 

    Without audio amplifier 

    Side tweeter (in the figure below) 

    No. 1 - No. 2:

    G16391251Courtesy of SUBARU OF AMERICA, INC.

    Front door speaker 

    No. 1 - No. 2:

    With audio amplifier 

    Side tweeter 

    No. 3 - No. 4:

    Is the resistance 3.2 Ω or more? (Side tweeter without audio amplifier)

    Is the resistance 3.1 Ω or more? (Front door speaker without audio amplifier)

    Is the resistance 3.4 Ω or more? (Side tweeter with audio amplifier)

    Yes  : Go to  4.

    No  : Replace the speaker. Ref. to ENTERTAINMENT & MONITORING>FRONT SPEAKER .

  4. CHECK THE TELEPHONE CALL  .
    1. Place the mobile phone in the vehicle.
    2. Establish a Bluetooth connection between the mobile phone in the vehicle and the vehicle unit.
    3. Make a call from outside to the mobile phone in the vehicle.
    4. Check that a telephone call is available through the in-vehicle microphone with the handsfree function.

    Is a telephone call successful?

    Yes  : The circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

    NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

    No  : Perform the diagnosis according to inspection for DTC B2A04 MIC CIRCUIT. Ref. to TELEMATICS SYSTEM (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B2A04 MIC CIRCUIT .

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