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Home >> Mitsubishi >> 2014 >> Lancer ES Sportback >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> MITSUBISHI Multi-Communication System (MMCS) - Lancer >> Symptom Procedures >> Inspection Procedure 2: No sound is heard < Vehicles without audio amplifier > >> Diagnosis

Inspection Procedure 2: No sound is heard < Vehicles without audio amplifier >: Diagnosis

Required Special Tools: 

  1. STEP 1. Checking with speaker test 

    Perform the speaker test, and check which speaker does not output the sound (Refer to SUBWOOFER < VEHICLES WITH ROCKFORD FOSGATE® PREMIUM SOUND SYSTEM > ).

    NOTE: In the following procedure, check the speaker or tweeter that is abnormal.

    Q: Is the check result normal? 

    • YES (normal for all):  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    • NO (No speaker and tweeter sound.):  Go to Step 2.
    • NO (No sound is heard from one of the speaker and tweeter.):  Go to  Step 5.
  2. STEP 2. Check door speaker connector E-13 < front-LH >, E-11 < front-RH >, E-24 < rear-LH > or E-23 < rear-RH >, or tweeter connector E-02 < LH > or E-04 < RH >, multivision display connector C-105 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is door speaker connector E-13 < front-LH >, E-11 < front-RH >, E-24 < rear-LH > or E-23 < rear-RH >, or tweeter connector E-02 < LH > or E-04 < RH >, multivision display connector C-105 in good condition? 

  3. STEP 3. Check the speaker or tweeter. 
    1. Remove the speaker or tweeter (Refer to REMOVAL AND INSTALLATION ).
    2. Check that the speaker or tweeter outputs the noise when the voltage of 5 V is applied to the speaker or tweeter connector terminal.

    Q: Does the speaker or tweeter output the noise? 

    • YES:  Go to Step 4.
    • NO:  Replace the speaker or tweeter.
  4. STEP 4. Check the wiring harness between the speaker, tweeter or subwoofer connector terminal and the multivision display connector terminal. 

    Check the communication lines for open circuit and short circuit.

    • < Front door speaker (LH) > Check the wiring harness between front door speaker (LH) connector E-13 (terminal 1, 2) and multivision display connector C-105 (terminal 8, 18).
      NOTE: Also check intermediate connector C-126 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-126 is damaged, repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .
    • < Front door speaker (RH) > Check the wiring harness between front door speaker (RH) connector E-11 (terminal 1, 2) and multivision display connector C-105 (terminal 6, 16).
      NOTE: Also check intermediate connector C-115 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-115 is damaged, repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .
    • < Rear door speaker (LH) > Check the wiring harness between rear door speaker (LH) connector E-24 (terminal 1, 2) and multivision display connector C-105 (terminal 7, 17).
      NOTE: Also check intermediate connectors C-36 and D-20 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-36 and D-20 is damaged, repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .
    • < Rear door speaker (RH) > Check the wiring harness between rear door speaker (RH) connector E-23 (terminal 1, 2) and multivision display connector C-105 (terminal 5, 15).
      NOTE: Also check intermediate connectors C-22 and D-01 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-22 and D-01 is damaged, repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .
    • < Tweeter (LH) > Check the wiring harness between tweeter (LH) connector E-02 (terminal 2, 1) and multivision display connector C-105 (terminal 8, 18).
      NOTE: Also check intermediate connector C-126 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-126 is damaged, repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .
    • < Tweeter (RH) > Check the wiring harness between tweeter (RH) connector E-04 (terminal 2, 1) and multivision display connector C-105 (terminal 6, 16).
      NOTE: Also check intermediate connector C-115 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-115 is damaged, repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between the speaker, tweeter or subwoofer connector terminal and the multivision display connector terminal in good condition? 

  5. STEP 5. Check door speaker connector E-13 < front-LH >, E-11 < front-RH >, E-24 < rear-LH > or E-23 < rear-RH >, or tweeter connector E-02 < LH > or E-04 < RH >, multivision display connector C-105 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is door speaker connector E-13 < front-LH >, E-11 < front-RH >, E-24 < rear-LH > or E-23 < rear-RH >, or tweeter connector E-02 < LH > or E-04 < RH >, multivision display connector C-105 in good condition? 

  6. STEP 6. Check the speaker or tweeter. 
    1. Remove the speaker or tweeter (Refer to REMOVAL AND INSTALLATION ).
    2. Check that the speaker or tweeter outputs the noise when the voltage of 5 V is applied to the speaker or tweeter connector terminal.

    Q: Does the speaker or tweeter output the noise? 

    • YES:  Go to Step 7.
    • NO:  Replace the speaker or tweeter.
  7. STEP 7. Check the wiring harness between the speaker, tweeter or subwoofer connector terminal and the multivision display connector terminal. 

    Follow the speaker test to check which speaker or tweeter circuit is defective.

    Check the communication lines for open circuit and short circuit.

    • < Front door speaker (LH) > Check the wiring harness between front door speaker (LH) connector E-13 (terminal 1, 2) and multivision display connector C-105 (terminal 8, 18).
      NOTE: Also check intermediate connector C-126 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-126 is damaged, repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .
    • < Front door speaker (RH) > Check the wiring harness between front door speaker (RH) connector E-11 (terminal 1, 2) and multivision display connector C-105 (terminal 6, 16).
      NOTE: Also check intermediate connector C-115 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-115 is damaged, repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .
    • < Rear door speaker (LH) > Check the wiring harness between rear door speaker (LH) connector E-24 (terminal 1, 2) and multivision display connector C-105 (terminal 7, 17).
      NOTE: Also check intermediate connectors C-36 and D-20 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-36 and D-20 is damaged, repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .
    • < Rear door speaker (RH) > Check the wiring harness between rear door speaker (RH) connector E-23 (terminal 1, 2) and multivision display connector C-105 (terminal 5, 15).
      NOTE: Also check intermediate connectors C-22 and D-01 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-22 and D-01 is damaged, repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .
    • < Tweeter (LH) > Check the wiring harness between tweeter (LH) connector E-02 (terminal 2, 1) and multivision display connector C-105 (terminal 8, 18).
      NOTE: Also check intermediate connector C-126 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-126 is damaged, repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .
    • < Tweeter (RH) > Check the wiring harness between tweeter (RH) connector E-04 (terminal 2, 1) and multivision display connector C-105 (terminal 6, 16).
      NOTE: Also check intermediate connector C-115 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-115 is damaged, repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between the speaker, tweeter or subwoofer connector terminal and the multivision display connector terminal in good condition? 

  8. STEP 8. Retest the system 

    Check if the sound is output from all the speaker, tweeter or subwoofer.

    Q: Is the check result normal? 

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