Inspection Procedure 3: No sound is heard from one of the speakers. < Vehicles with 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. Check the ETACS-ECU coding data. 

   Use scan tool MB991958 to diagnose the CAN bus lines.

   CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
   1. Connect scan tool MB991958. Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)  ".
   2. Turn the ignition switch to "ON" position.
   3. Operate the scan tool MB991958 to read the ETACS-ECU option coding information (Refer to CODING LIST ).
   4. Check that the "Speaker" is set to "Premium".

   Q: Is the check result normal? 

   YES:  Go to Step 2.

   NO:  Operate scan tool MB991958 to set the option coding "Speaker" to "Premium," and check the trouble symptom.

   Fig 1: Connecting Special Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Check the MMCS service mode, CAN communication confirmation, and coding data. 
   1. Display the CAN Communication Confirmation and Coding Data of the MMCS service mode (Refer to SERVICE MODE  )
   2. Check if PREMIUM is displayed.

   Q: Is the check result normal? 

   YES:  Go to Step 3.

   NO:  Go to  Step 4.

3. STEP 3. Check the service data log for the MMCS service mode. 

   With the service data log of MMCS service mode displayed, check if the service data log for SP (speaker) is displayed (Refer to SERVICE MODE  ).

   Q: Is the service data log for SP (speaker) displayed? 

   YES:  Go to step 4.

   NO:  Go to  Step 7.

4. STEP 4. Using scan tool MB991958, diagnose the CAN bus line. 

   Use scan tool MB991958 to diagnose the CAN bus lines.

   1. Turn the ignition switch to "ON" position.
   2. Diagnose the CAN bus line.

   Q: Is the check result normal? 

   YES:  Go to step 5.

   NO:  Repair the CAN bus line.

5. STEP 5. Using scan tool MB991958, read the CAN box unit diagnostic trouble code. 

   Check again if the DTC is set to the CAN box unit.

   Q: Is the DTC set? 

   YES:  Troubleshoot the MMCS (Refer to DIAGNOSTIC TROUBLE CODE CHART  ).

   NO:  Go to Step 6.

6. STEP 6. Using scan tool MB991958, read the ETACS-ECU diagnostic trouble code. 

   Check if the diagnostic trouble code is set to the ETACS-ECU.

   Q: Is the DTC set? 

   YES:  Diagnose the ETACS-ECU (Refer to ETACS-ECU - Troubleshooting ).

   NO:  Go to Step 7.

7. STEP 7. Checking with audio speaker check. 

   Perform the audio speaker check, and check which speaker does not output the sound. Refer to SERVICE MODE  .

   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 >  : Refer to INSPECTION PROCEDURE 2 "NO SOUND IS HEARD"  .

   NO < only front door speaker (RH) is abnormal >  : Go to Step 8.

   NO < only front door speaker (LH) is abnormal >  : Go to  Step 14.

   NO < only rear door speaker (RH) is abnormal >  : Go to  Step 20.

   NO < only rear door speaker (LH) is abnormal >  : Go to  Step 24.

   NO < only tweeter (RH) is abnormal >  : Go to  Step 28.

   NO < only tweeter (LH) is abnormal >  : Go to  Step 32.

   NO < only subwoofer is abnormal >  : Go to  Step 36.

8. STEP 8. 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 9.

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

9. STEP 9. Check the front door speaker (RH). 
   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 five volts are applied to the front door speaker (RH) connector terminal.

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

   YES:  Go to Step 10.

   NO:  Replace the front door speaker (RH).

   Fig 2: Checking Front Door Speaker (RH)

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
10. STEP 10. Check audio amplifier connector D-126 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is audio amplifier connector D-126 in good condition? 

    YES:  Go to Step 11.

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

11. STEP 11. Check the wiring harness between audio amplifier connector D-126 (terminal 27, 37) and front door speaker (RH) connector E-04 (terminal 1, 2). 
    NOTE: Also check intermediate connectors C-20 and C-112 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-20 or 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 audio amplifier connector D-126 (terminal 27, 37) and front door speaker (RH) connector E-04 (terminal 1, 2) in good condition? 

    YES:  Go to Step 12.

    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.

12. STEP 12. Check audio visual navigation unit connector C-10 and audio amplifier connector D-127 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are audio visual navigation unit connector C-10 and audio amplifier connector D-127 in good condition? 

    YES:  Go to Step 13.

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

13. STEP 13. Check the wiring harness between audio visual navigation unit connector C-10 (terminal 7, 15) and audio amplifier connector D-127 (terminal 11, 10). 
    NOTE: Also check intermediate connectors C-17 and C-22 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-17 or C-22 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 audio visual navigation unit connector C-10 (terminal 7, 15) and audio amplifier connector D-127 (terminal 11, 10) in good condition? 

    YES:  Check the trouble symptom, and go to  Step 40.

    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.

14. STEP 14. 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 15.

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

15. STEP 15. Check the front door speaker (LH). 
    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 five volts are applied to the front door speaker (LH) connector terminal.

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

    YES:  Go to Step 16.

    NO:  Replace the front door speaker (LH).

    Fig 3: Checking Front Door Speaker (LH)

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
16. STEP 16. Check audio amplifier connector D-126 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is audio amplifier connector D-126 in good condition? 

    YES:  Go to Step 17.

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

17. STEP 17. Check the wiring harness between audio amplifier connector D-126 (terminal 28, 38) and front door speaker (LH) connector E-17 (terminal 1, 2). 
    NOTE: Also check intermediate connectors C-20 and C-126 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-20 or 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 audio amplifier connector D-126 (terminal 28, 38) and front door speaker (LH) connector E-17 (terminal 1, 2) in good condition? 

    YES:  Go to Step 18.

    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.

18. STEP 18. Check audio visual navigation unit connector C-10 and audio amplifier connector D-127 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are audio visual navigation unit connector C-10 and audio amplifier connector D-127 in good condition? 

    YES:  Go to Step 19.

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

19. STEP 19. Check the wiring harness between audio visual navigation unit connector C-10 (terminal 3, 12) and audio amplifier connector D-127 (terminal 12, 4) 
    • Check the communication lines for open circuit and short circuit.
      NOTE: Also check intermediate connectors C-17 and C-22 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-17 or C-22 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between audio visual navigation unit connector C-10 (terminal 3, 12) and audio amplifier connector D-127 (terminal 12, 4) in good condition? 

    YES:  Check the trouble symptom, and go to  Step 40.

    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.

20. STEP 20. 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 21.

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

21. STEP 21. Check the rear door speaker (RH). 
    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 five volts are applied to the rear door speaker (RH) connector terminal.

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

    YES:  Go to Step 22.

    NO:  Replace the rear door speaker (RH).

    Fig 4: Checking Rear Door Speaker (RH)

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
22. STEP 22. Check audio amplifier connector D-127 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is audio amplifier connector D-127 in good condition? 

    YES:  Go to Step 23.

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

23. STEP 23. Check the wiring harness between audio amplifier connector D-127 (terminal 2, 8) and rear door speaker (RH) connector E-10 (terminal 1, 2). 
    NOTE: Also check intermediate connector D-36 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector 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 audio amplifier connector D-127 (terminal 2, 8) and rear door speaker (RH) connector E-10 (terminal 1, 2) in good condition? 

    YES:  Check the trouble symptom, and go to  Step 40.

    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.

24. STEP 24. 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 25.

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

25. STEP 25. Check the rear door speaker (LH). 
    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 five volts are applied to the rear door speaker (LH) connector terminal.

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

    YES:  Go to Step 26.

    NO:  Replace the rear door speaker (LH).

    Fig 5: Checking Rear Door Speaker (LH)

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
26. STEP 26. Check audio amplifier connector D-127 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is audio amplifier connector D-127 in good condition? 

    YES:  Go to Step 27.

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

27. STEP 27. Check the wiring harness between audio amplifier connector D-127 (terminal 1, 7) and rear door speaker (LH) connector E-24 (terminal 1, 2). 
    NOTE: Also check intermediate connector D-21 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector 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 audio amplifier connector D-127 (terminal 1, 7) and rear door speaker (LH) connector E-24 (terminal 1, 2) in good condition? 

    YES:  Check the trouble symptom, and go to  Step 40.

    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.

28. STEP 28. 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 29.

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

29. STEP 29. Check the tweeter (RH). 
    1. Remove the tweeter (RH). Refer to FRONT OR REAR DOOR SPEAKER .
    2. Check that the tweeter (RH) outputs the noise when five volts are applied to the tweeter (RH) connector terminal.

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

    YES:  Go to Step 30.

    NO:  Replace the tweeter (RH).

    Fig 6: Checking Tweeter (RH)

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
30. STEP 30. Check audio amplifier connector D-127 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is audio amplifier connector D-127 in good condition? 

    YES:  Go to Step 31.

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

31. STEP 31. Check the wiring harness between audio amplifier connector D-127 (terminal 5, 13) and tweeter (RH) connector E-02 (terminal 2, 1). 
    NOTE: Also check intermediate connectors C-22 and C-113 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-22 or 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 audio amplifier connector D-127 (terminal 5, 13) and tweeter (RH) connector E-02 (terminal 2, 1) in good condition? 

    YES:  Check the trouble symptom, and go to  Step 40.

    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.

32. STEP 32. 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 33.

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

33. STEP 33. Check the tweeter (LH). 
    1. Remove the tweeter (LH). Refer to FRONT OR REAR DOOR SPEAKER .
    2. Check that the tweeter (LH) outputs the noise when five volts are applied to the tweeter (LH) connector terminal.

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

    YES:  Go to Step 34.

    NO:  Replace the tweeter (LH).

    Fig 7: Checking Tweeter (LH)

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
34. STEP 34. Check audio amplifier connector D-127 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is audio amplifier connector D-127 in good condition? 

    YES:  Go to Step 35.

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

35. STEP 35. Check the wiring harness between audio amplifier connector D-127 (terminal 6, 14) and tweeter (LH) connector E-14 (terminal 2, 1). 
    NOTE: Also check intermediate connectors C-22 and C-113 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-22 or 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 audio amplifier connector D-127 (terminal 6, 14) and tweeter (LH) connector E-14 (terminal 2, 1) in good condition? 

    YES:  Check the trouble symptom, and go to  Step 40.

    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.

36. STEP 36. Check subwoofer connector D-15 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is subwoofer connector D-15 in good condition? 

    YES:  Go to Step 37.

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

37. STEP 37. Check the Subwoofer. 
    1. Remove the subwoofer. Refer to FRONT OR REAR DOOR SPEAKER .
    2. Check that the subwoofer outputs the noise when five volts are applied to the subwoofer connector terminal.

    Q: Does the subwoofer output the noise? 

    YES:  Go to Step 38.

    NO:  Replace the subwoofer.

    Fig 8: Checking Subwoofer Connector Terminal

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
38. STEP 38. Check audio amplifier connector D-126 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is audio amplifier connector D-126 in good condition? 

    YES:  Go to Step 39.

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

39. STEP 39. Check the wiring harness between audio amplifier connector D-126 (terminal 21, 22, 29, 30) and subwoofer connector D-15 (terminal 4, 2, 3, 1). 
    • Check the communication lines for open circuit and short circuit.

    Q: Is the wiring harness between audio amplifier connector D-126 (terminal 21, 22, 29, 30) and subwoofer connector D-15 (terminal 4, 2, 3, 1) in good condition? 

    YES:  Check the trouble symptom, and go to Step 40.

    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.

40. STEP 40. Replace the audio amplifier temporarily, and check the trouble symptom. 

    Replace the audio amplifier temporarily, and check that the sound is output from the speaker.

    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 audio visual navigation unit.