Vehicles Without Audio Amplifier
Inspection Procedure 3: No sound is heard from one of the speakers. [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.)
TECHNICAL DESCRIPTION (COMMENT)
If the sound is not heard from one of the speakers, the speaker, multivision display, communication line from the multivision display to the speaker may have a problem. Also, the option coding information may be inconsistent.
TROUBLESHOOTING HINTS
- Speaker may be defective
- Multivision display may be defective
- Option coding information inconsistency
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
DIAGNOSIS
STEP 1. 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 2.
NO Operate scan tool MB991958 to set the option coding "Number of speaker" to "6 speakers" and check the trouble symptom.
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 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 3.
NO Go to Step 4.
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 Without Manufacture's Scan Tool (Service Mode).)
Q. Is the service data log for SP (speaker) displayed?
YES Go to Step 4.
NO Go to Step 7.
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.
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 Mitsubishi Multi Communication System (MMCS)).
NO Go to Step 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 Electronic Time and Alarm Control System (ETACS)).
NO Go to Step 7.
STEP 7. Checking with audio speaker check
Perform the audio speaker check, and check which speaker does not output the sound (Refer to Without Manufacture's Scan Tool (Service Mode)).
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 How to Cope With Intermittent Malfunctions).
NO (abnormal for all) : Check the multivision display power supply and ground circuit, and repair if necessary.
If the multivision display power supply and ground circuit is normal, replace the multivision display.
NO (Either a speaker is abnormal) : Go to Step 8.
STEP 8. Check door speaker connector F-11 [front-LH], F-08 [front-RH], F-23 [rear-LH] or F-20 [rear-RH], or tweeter connector F-02 [LH] or F-03 [RH] for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q. Is door speaker connector F-11[ front-LH], F-08[ front-RH], F-23[ rear-LH] or F-20[ rear-RH], or tweeter connector F-02[ LH] or F-03[ RH] in good condition?
YES Go to Step 9.
NO Repair or replace the damaged component Harness Connector Inspection).
STEP 9. 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 10.
NO Replace the speaker or tweeter.
STEP 10. 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 11.
NO Repair or replace the damaged component Harness Connector Inspection).
STEP 11. Check the wiring harness between the speaker or tweeter 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 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 connectors 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 F-22, C-26 and C-104 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors F-22, C-26 or C-104 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 F-21, C-17 and C-104 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector F-21, C-17 or C-104 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 2, 1) and multivision display connector C-118 (terminal 12, 3).
NOTE:
Also check intermediate connectors C-225 and C-104 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-225 or C-104 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 2, 1) and multivision display connector C-118 (terminal 15, 7).
NOTE:
Also check intermediate connectors C-212 and C-104 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-212 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 the speaker or tweeter connector terminal and the audio amplifier connector terminal 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.
STEP 12. Replace the multivision display temporarily, and check the trouble symptom.
Replace the multivision display temporarily, and check that the sound is output from the speaker.
Q. Is the check result normal?
YES Replace the multivision display.
NO Replace the speaker or tweeter that does not output sound.