Vehicles Without Audio Amplifier

Inspection Procedure 2: No sound is heard. [Vehicles without 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 sound is not output, the multivision display 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

- The multivision display may be defective
- The speaker or tweeter may be defective
- 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 "Number of speaker" is set to "6 speakers".

Q. Is the check result normal?

YES Go to Step 3.
NO Operate scan tool MB991958 to set the option coding "Number of speaker" to "6 speakers," 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 "6 SPEAKER (2 TWEETER)" is displayed as the number of installed speakers.

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.
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.
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.

Q. Is the check result normal?

YES Go to Step 10.
NO Go to Step 14.
STEP 10. 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

Q. Are all the connectors in good condition?

YES Go to Step 11.
NO Repair the defective connector.
STEP 11. Check the speaker or tweeter.

(1)Remove the speaker or tweeter (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.

Q. Does the speaker or tweeter output the noise?

YES Go to Step 12.
NO Replace the speaker or tweeter.
STEP 12. Check multivision display connector C-118 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is multivision display connector C-118 in good condition?

YES Go to Step 13.
NO Repair or replace the damaged component Harness Connector Inspection).
STEP 13. Check the wiring harness between the speaker or tweeter connector terminal and the multivision display 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 multivision display connector C-118 (terminal 12, 3).
NOTE:
Also check intermediate connectors C-104 and C-225 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-104 or C-225 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 multivision display connector C-118 (terminal 15, 7).
NOTE:
Also check intermediate connectors C-104 and C-212 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-104 or C-212 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 multivision display connector C-118 (terminal 11, 2).
NOTE:
Also check intermediate connectors C-26, C-104 and F-22 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-26, C-104 or 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 multivision display connector C-118 (terminal 16, 8).
NOTE:
Also check intermediate connectors C-17, C-104 and F-21 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-17, C-104 or 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 multivision display connector C-118 (terminal 3, 12).
NOTE:
Also check intermediate connectors C-104 and C-225 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-104, C-225 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 multivision display connector C-118 (terminal 7, 15).
NOTE:
Also check intermediate connectors C-104 and C-212 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-104, C-212 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection .

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

YES Go to Step 14.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 14. 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 Replace the multivision display.