Inspection Procedure 3: No sound is heard from one of the speakers. < Vehicles without audio amplifier >: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: Vehicle Communication Interface (V.C.I.).
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A

1. STEP 1. ETACS-ECU coding data check. 
   1. Operate the scan tool to read the ETACS-ECU option coding information (Refer to CODING LIST ).
   2. Check that the "Speaker" is set to "6 speakers" or "4 speakers".

   Q: Is the check result normal? 

   YES:  Go to Step 2.

   NO:  Operate the scan tool to set the option coding "Speaker" to "6 speakers" or "4 speakers," and check the trouble symptom.

   Fig 1: Connecting Special Tools To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Checking with audio speaker check. 

   Perform the audio speaker check, and check which speaker does not output the sound. Refer to SPEAKER TEST .

   Q: Is the check result normal? 

   YES < normal for all >  : The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).

   NO < abnormal for all >  : Go to  Step 27.

   NO < only front door speaker (RH) is abnormal >  : Go to Step 3.

   NO < only front door speaker (LH) is abnormal >  : Go to  Step 7.

   NO < only rear door speaker (RH) is abnormal >  : Go to  Step 11.

   NO < only rear door speaker (LH) is abnormal >  : Go to  Step 15.

   NO < only tweeter (RH) vehicles with 6 speakers is abnormal >  : Go to  Step 19.

   NO < only tweeter (LH) vehicles with 6 speakers is abnormal >  : Go to  Step 23.

3. STEP 3. Check front door speaker (RH) connector E-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is front door speaker (RH) connector E-04 in good condition? 

   YES:  Go to Step 4.

   NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .

4. STEP 4. Front door speaker (RH) check. 
   1. Remove the front door speaker (RH). Refer to FRONT OR REAR DOOR SPEAKER .
   2. Check that the front door speaker (RH) outputs the noise when the voltage of five volts is applied to the front door speaker (RH) connector terminal.

   Q: Does the front door speaker (RH) output the noise? 

   YES:  Go to Step 5.

   NO:  Replace the front door speaker (RH).

   Fig 2: Checking Front Door Speaker (RH)

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. Check radio and CD player connector C-16 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is radio and CD player connector C-16 in good condition? 

   YES:  Go to Step 6.

   NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .

6. STEP 6. Check the wiring harness between radio and CD player connector C-16 (terminal 26, 36) and front door speaker (RH) connector E-04 (terminal 1, 2). 
   NOTE: Also check intermediate connector C-112 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-112 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .
   • Check the communication lines for open circuit and short circuit.

   Q: Is the wiring harness between radio and CD player connector C-16 (terminal 26, 36) and front door speaker (RH) connector E-04 (terminal 1, 2) in good condition? 

   YES:  Check the trouble symptom. Go to  Step 27.

   NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.

7. STEP 7. Check front door speaker (LH) connector E-17 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is front door speaker (LH) connector E-17 in good condition? 

   YES:  Go to Step 8.

   NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .

8. STEP 8. Front door speaker (LH) check. 
   1. Remove the front door speaker (LH). Refer to FRONT OR REAR DOOR SPEAKER .
   2. Check that the front door speaker (LH) outputs the noise when the voltage of five volts is applied to the front door speaker (LH) connector terminal.

   Q: Does the front door speaker (LH) output the noise? 

   YES:  Go to Step 9.

   NO:  Replace the front door speaker (LH).

   Fig 3: Checking Front Door Speaker (LH)

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
9. STEP 9. Check radio and CD player connector C-16 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is radio and CD player connector C-16 in good condition? 

   YES:  Go to Step 10.

   NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .

10. STEP 10. Check the wiring harness between radio and CD player connector C-16 (terminal 28, 38) and front door speaker (LH) connector E-17 (terminal 1, 2). 
    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 as described in HARNESS CONNECTOR INSPECTION .
    • Check the communication lines for open circuit and short circuit.

    Q: Is the wiring harness between radio and CD player connector C-16 (terminal 28, 38) and front door speaker (LH) connector E-17 (terminal 1, 2) in good condition? 

    YES:  Check the trouble symptom. Go to  Step 27.

    NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.

11. STEP 11. Check rear door speaker (RH) connector E-10 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is rear door speaker (RH) connector E-10 in good condition? 

    YES:  Go to Step 12.

    NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .

12. STEP 12. Rear door speaker (RH) check 
    1. Remove the rear door speaker (RH). Refer to FRONT OR REAR DOOR SPEAKER .
    2. Check that the rear door speaker (RH) outputs the noise when the voltage of five volts is applied to the rear door speaker (RH) connector terminal.

    Q: Does the rear door speaker (RH) output the noise? 

    YES:  Go to Step 13.

    NO:  Replace the rear door speaker (RH).

    Fig 4: Checking Rear Door Speaker (RH)

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
13. STEP 13. Check radio and CD player connector C-16 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is radio and CD player connector C-16 in good condition? 

    YES:  Go to Step 14.

    NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .

14. STEP 14. Check the wiring harness between radio and CD player connector C-16 (terminal 25, 35) and rear door speaker (RH) connector E-10 (terminal 1, 2). 
    NOTE: Also check intermediate connectors C-20 and D-36 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-20 or D-36 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .
    • Check the communication lines for open circuit and short circuit.

    Q: Is the wiring harness between radio and CD player connector C-16 (terminal 25, 35) and rear door speaker (RH) connector E-10 (terminal 1, 2) in good condition? 

    YES:  Check the trouble symptom. Go to  Step 27.

    NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.

15. STEP 15. Check rear door speaker (LH) connector E-24 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is rear door speaker (LH) connector E-24 in good condition? 

    YES:  Go to Step 16.

    NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .

16. STEP 16. Rear door speaker (LH) check. 
    1. Remove the rear door speaker (LH). Refer to FRONT OR REAR DOOR SPEAKER .
    2. Check that the rear door speaker (LH) outputs the noise when the voltage of five volts is applied to the rear door speaker (LH) connector terminal.

    Q: Does the rear door speaker (LH) output the noise? 

    YES:  Go to Step 17.

    NO:  Replace the rear door speaker (LH).

    Fig 5: Checking Rear Door Speaker (LH)

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
17. STEP 17. Check radio and CD player connector C-16 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is radio and CD player connector C-16 in good condition? 

    YES:  Go to Step 18.

    NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .

18. STEP 18. Check the wiring harness between radio and CD player connector C-16 (terminal 27, 37) and rear door speaker (LH) connector E-24 (terminal 1, 2). 
    NOTE: Also check intermediate connectors C-32 and D-21 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-32 or D-21 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .
    • Check the communication lines for open circuit and short circuit.

    Q: Is the wiring harness between radio and CD player connector C-16 (terminal 27, 37) and rear door speaker (LH) connector E-24 (terminal 1, 2) in good condition? 

    YES:  Check the trouble symptom. Go to  Step 27.

    NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.

19. STEP 19. Check tweeter (RH) connector E-02 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is tweeter (RH) connector E-02 in good condition? 

    YES:  Go to Step 20.

    NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .

20. STEP 20. Tweeter (RH) check. 
    1. Remove the tweeter (RH). Refer to FRONT OR REAR DOOR SPEAKER .
    2. Check that the tweeter (RH) outputs the noise when the voltage of five volts is applied to the tweeter (RH) connector terminal.

    Q: Does the tweeter (RH) output the noise? 

    YES:  Go to Step 21.

    NO:  Replace the tweeter (RH).

    Fig 6: Checking Tweeter (RH)

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
21. STEP 21. Check radio and CD player connector C-16 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is radio and CD player connector C-16 in good condition? 

    YES:  Go to Step 22.

    NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .

22. STEP 22. Check the wiring harness between radio and CD player connector C-16 (terminal 26, 36) and tweeter (RH) connector E-02 (terminal 2, 1). 
    NOTE: Also check intermediate connector C-113 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-113 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .
    • Check the communication lines for open circuit and short circuit.

    Q: Is the wiring harness between radio and CD player connector C-16 (terminal 26, 36) and tweeter (RH) connector E-02 (terminal 2, 1) in good condition? 

    YES:  Check the trouble symptom. Go to  Step 27.

    NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.

23. STEP 23. Check tweeter (LH) connector E-14 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is tweeter (LH) connector E-14 in good condition? 

    YES:  Go to Step 24.

    NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .

24. STEP 24. Tweeter (LH) check. 
    1. Remove the tweeter (LH). Refer to FRONT OR REAR DOOR SPEAKER .
    2. Check that the tweeter (LH) outputs the noise when the voltage of five volts is applied to the tweeter (LH) connector terminal.

    Q: Does the tweeter (LH) output the noise? 

    YES:  Go to Step 25.

    NO:  Replace the tweeter (LH).

    Fig 7: Checking Tweeter (LH)

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
25. STEP 25. Check radio and CD player connector C-16 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is radio and CD player connector C-16 in good condition? 

    YES:  Go to Step 26.

    NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .

26. STEP 26. Check the wiring harness between radio and CD player connector C-16 (terminal 28, 38) and tweeter (LH) connector E-14 (terminal 2, 1). 
    NOTE: Also check intermediate connector C-127 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-127 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .
    • Check the communication lines for open circuit and short circuit.

    Q: Is the wiring harness between radio and CD player or CD changer connector C-16 (terminal 28, 38) and tweeter (LH) connector E-14 (terminal 2, 1) in good condition? 

    YES:  Check the trouble symptom. Go to Step 27.

    NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.

27. STEP 27. Retest the system 

    Check if the sound is output from the speakers.

    Q: Is the check result normal? 

    YES:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).

    NO:  Replace the radio and CD player.