Vehicles With Audio Amplifier
Inspection Procedure 2: No sound is heard. [Vehicles with audio amplifier]
CAUTION:
Before replacing the multivision display, ensure that the power supply circuit, the ground circuit, and the communication circuit are normal. (Check that the voltage is 10 V or more.)
COMMENTS ON TROUBLE SYMPTOM
If the audio sound is not output, the multivision display, audio amplifier, or power supply circuit of audio amplifier may have a problem. In addition, if any of the speakers is short-circuited, the protection circuit inside the multivision display disables all the speakers to sound. Therefore, if all the speakers do not output sound, the speaker circuit may be shorted or the speaker may be defective. In some cases, the sound is output depending on sources, thus use the music server, radio, CD/DVD, and others to check if the sound is output. Also, the option coding information may be inconsistent.
PROBABLE CAUSES
- Malfunctions of multivision display
- Malfunction of audio amplifier
- Malfunction of speaker or tweeter
- Option coding information inconsistency
- Damaged harness wires and connectors
DIAGNOSIS
Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
STEP 1. Check the multivision display operation.
Q. Check the sources from which the sound is not output.
No sound only from radio : Perform Inspection Procedure 6 "The AM/FM radio broadcasting cannot be received."
(Refer to Inspection Procedure 6.)
No sound only when the CD is played : Perform Inspection Procedure 8 "CD/DVD cannot be Played." (Refer to Inspection Procedure 8.)
No sound only when the DVD is played : Perform Inspection Procedure 8 "CD/DVD cannot be Played."(Refer to Inspection Procedure 8.) or Inspection Procedure 9 "Image of a DVD is Played, but no Sound is Played." (Refer to Inspection Procedure 9.)
No sound only when the music server is used : Go to Step 8.
No sound from any of the sources : Go to Step 2.
STEP 2. Check the ETACS-ECU coding data.
Use scan tool MB991958 to diagnose the CAN bus lines.
(1)
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.
Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."
(2)Turn the ignition switch to "ON" position.
(3)Operate the scan tool MB991958 to read the ETACS-ECU option coding information
Programming and Relearning).
(4)Check that the "Speaker" is set to "Premium."
Q. Is the check result normal?
YES Go to Step 3.
NO Operate scan tool MB991958 to set the option coding "Speaker" to "Premium," and check the trouble symptom.
STEP 3. 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 Without Manufacture's Scan Tool (Service Mode))
(2)Check if PREMIUM is displayed.
Q. Is the check result normal?
YES Go to step 4.
NO Go to step 5.
STEP 4. 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 Without Manufacture's Scan Tool (Service Mode))
Q. Is the service data log for SP (speaker) displayed?
YES Go to step 5.
NO Go to step 8.
STEP 5. 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 6.
NO Repair the CAN bus line. CAN Bus Diagnostics Chart).
STEP 6. 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 Mitsubishi Multi Communication System (MMCS)).
NO Go to Step 7.
STEP 7. 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 Electronic Time and Alarm Control System (ETACS)).
NO Go to Step 8.
STEP 8. Check the service data log for the MMCS service mode.
(1)Display the service data log for the MMCS service mode. (Refer to Without Manufacture's Scan Tool (Service Mode))
(2)Check if the service data log for drive and HDD is displayed.
Q. Is the service data log displayed?
YES (The service data log for drive is displayed.) : Perform Inspection Procedure 8 "CD/DVD cannot be Played."(Refer to Inspection Procedure 8.) or Inspection Procedure 9 "Image of a DVD is Played, but no Sound is Played." (Refer to Inspection Procedure 9.) Go to Step 9.
YES (The service data log for HDD is displayed.) : Abnormalities relating to high or low temperature may be present. Check if the multivision display can output the sound at the operable temperature. If it cannot output the sound, go to Step 9.
YES (The service data log for AMP is displayed.) : Go to Step 9.
NO Go to Step 9.
STEP 9. Perform "Network/Connect Line Check" in the MMCS service mode.
(1)Display "Network/Connect Line Check" in the MMCS service mode. (Refer to Without Manufacture's Scan Tool (Service Mode))
(2)Check if "DVD Drive OK" is displayed.
(3)Check if "HDD Drive OK" is displayed.
(4)Check if "Premium Audio OK" is displayed.
Q. Is the check result normal?
YES Go to Step 10.
NO Go to Step 22.
STEP 10. Check audio amplifier connector D-06 and D-07 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q. Is audio amplifier connector D-06 and D-07 in good condition?
YES Go to Step 11.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 11. Check the ground circuit to the rear monitor. Measure the resistance at audio amplifier connector D-07.
(1)Disconnect audio amplifier connector D-07, and measure the resistance available at the wiring harness side of the connector.
(2)Measure the resistance between terminal 24 and ground.
OK: The resistance should be 2 ohms or less.
(3)Measure the resistance between terminal 31 and ground.
OK: The resistance should be 2 ohms or less.
(4)Measure the resistance between terminal 32 and ground.
OK: The resistance should be 2 ohms or less.
Q. Is the measured resistance 2 ohms or less?
YES Go to Step 13.
NO Go to Step 12.
STEP 12. Check the wiring harness between audio amplifier connector D-07 (terminal 24, 31, 32) and ground.
- Check the ground wires for open circuit.
Q. Is the wiring harness between audio amplifier connector D-07 (terminal 24, 31, 32) and ground in good condition?
YES Go to Step 13.
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.
STEP 13. Check the power supply circuit to the ETACS-ECU. Measure the voltage at audio amplifier connector D-07.
(1)Disconnect audio amplifier connector D-07, and measure the voltage available at the wiring harness-side connector.
(2)Measure the voltage between terminal 25 and ground.
OK: The voltage should measure approximately 12 volts (battery positive voltage).
(3)Measure the voltage between terminal 35 and ground.
OK: The voltage should measure approximately 12 volts (battery positive voltage).
(4)Measure the voltage between terminal 36 and ground.
OK: The voltage should measure approximately 12 volts (battery positive voltage).
Q. Is the measured voltage approximately 12 volts (battery positive voltage)?
YES Go to Step 15.
NO Go to Step 14.
STEP 14. Check the wiring harness between audio amplifier connector D-07 (terminal 25, 35, 36) and fusible link (36).
- Check the power supply lines for open circuit and short circuit.
NOTE:
Also check intermediate connector C-15 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-15 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.
Q. Is the wiring harness between audio amplifier connector D-07 (terminal 25, 35, 36) and fusible link (36) in good condition?
YES Go to Step 15.
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.
STEP 15. Check multivision display connector C-111 and C-118 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q. Are multivision display connector C-111 and C-118 in good condition?
YES Go to Step 16.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 16. Check the wiring harness between multivision display connector C-111 (terminal 102) and audio amplifier connector D-06 (terminal 3)
- Check the communication line for open circuit and short circuit.
NOTE:
Also check intermediate connectors C-16 and C-106 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-16 or C-106 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.
Q. Is the wiring harness between multivision display connector C-111 (terminal 102) and audio amplifier connector D-06 (terminal 3) in good condition?
YES
Go to Step 17.
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.
STEP 17. Check the wiring harness between multivision display connector C-118 (terminal 6) and audio amplifier connector D-07 (terminal 34)
- Check the communication line for open circuit and short circuit.
NOTE:
Also check intermediate connectors C-16 and C-106 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-16 or C-106 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.
Q. Is the wiring harness between multivision display connector C-118 (terminal 6) and audio amplifier connector D-07 (terminal 34) 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.
STEP 18. Check the following connectors.
Check the following connectors:
- F-11 front door speaker (LH) connector
- F-08 front door speaker (RH) connector
- F-23 rear door speaker (LH) connector
- F-20 rear door speaker (RH) connector
- F-02 tweeter (LH) connector
- F-03 tweeter (RH) connector
- D-14 sub woofer connector
Q. Are all the connectors in good condition?
YES Go to Step 19.
NO Repair the defective connector.
STEP 19. Check the speaker, tweeter or subwoofer.
(1)Remove the speaker, tweeter or subwoofer (Refer to Service and Repair).
(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. [speaker or tweeter]
(3)Check that the subwoofer outputs the noise when the voltage of 5 V is applied to the subwoofer connector terminal. [subwoofer]
Q. Is the check result normal?
YES Go to Step 20.
NO Replace the speaker, tweeter or subwoofer.
STEP 20. Check the wiring harness between the speaker, tweeter or sub woofer connector terminal and the audio amplifier connector terminal.
Check the communication lines for short circuit.
- [Front door speaker (LH)] Check the wiring harness between front door speaker (LH) connector F-11 (terminal 1, 2) and audio amplifier connector D-07 (terminal 28, 38).
NOTE:
Also check intermediate connectors C-225 and C-16 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-225 or C-16 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection .
- [ Front door speaker (RH)] Check the wiring harness between front door speaker (RH) connector F-08 (terminal 1, 2) and audio amplifier connector D-07 (terminal 27, 37).
NOTE:
Also check intermediate connectors C-212 and C-16 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-212 or C-16 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection .
- [ Rear door speaker (LH)] Check the wiring harness between rear door speaker (LH) connector F-23 (terminal 1, 2) and audio amplifier connector D-06 (terminal 1, 7).
NOTE:
Also check intermediate connector F-22 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector F-22 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection .
- [ Rear door speaker (RH)] Check the wiring harness between rear door speaker (RH) connector F-20 (terminal 1, 2) and audio amplifier connector D-06 (terminal 2, 8).
NOTE:
Also check intermediate connector F-21 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector F-21 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection .
- [ Tweeter (LH)] Check the wiring harness between tweeter (LH) connector F-02 (terminal 1, 2) and audio amplifier connector D-06 (terminal 14, 6).
NOTE:
Also check intermediate connectors C-225 and C-16 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-225 or C-16 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection .
- [ Tweeter (RH)] Check the wiring harness between tweeter (RH) connector F-03 (terminal 1, 2) and audio amplifier connector D-06 (terminal 13, 5).
NOTE:
Also check intermediate connectors C-212 and C-16 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-212 or C-16 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection .
- [ Subwoofer] Check the wiring harness between subwoofer connector D-14 (terminal 1, 2, 3, 4) and audio amplifier connector D-07 (terminal No.30, 22, 29, 21).
Q. Is the wiring harness between the speaker, tweeter or sub woofer connector terminal and the audio amplifier connector terminal in good condition?
YES Go to Step 21.
NO Repair or replace the damaged component Harness Connector Inspection).
STEP 21. Check the harness wire between multivision display connector C-118 (terminal 3, 7, 12, 15) and audio amplifier connector D-06 (terminal 12, 11, 4, 10).
- Check the communication lines for short circuit.
NOTE:
Also check intermediate connectors C-16 and C-104 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-16 or C-104 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.
Q. Is the wiring harness between multivision display connector C-118 (terminal 3, 7, 12, 15) and audio amplifier connector D-06 (terminal 12, 11, 4, 10) in good condition?
YES Check the trouble symptom, go to Step 22.
NO Repair or replace the damaged component Harness Connector Inspection).
STEP 22. Retest the system
Check if the sound is output from all the speakers.
Q. Is the check result normal?
YES The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Go to Step 23.
STEP 23. Replace the audio amplifier temporarily, and check the trouble symptom.
Replace the audio amplifier temporarily, and check that the sound is output from all the speakers.
Q. Is the check result normal?
YES Replace the audio amplifier.
NO Replace the multivision display.