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.)
TECHNICAL DESCRIPTION (COMMENT)
If the audio sound is not output, the multivision display, audio amplifier, or power supply circuit of audio amplifier may have a problem, or the option coding information may be inconsistent.
TROUBLESHOOTING HINTS
- The multivision display may be defective
- The audio amplifier may be defective
- Option coding information inconsistency
DIAGNOSIS
Required Special Tools:
- 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
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.)
Only the sound that is relevant to the hands free function and USB adapter function is not output. [Vehicles with hands free module] : Diagnose the hands free module. (Refer to Symptom Chart.)
Only the sound relevant to USB adapter is not output. [Vehicles with USB box] : Troubleshoot the USB box. (Refer to Symptom Chart.)
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) With Manufacture's Scan Tool (Service Mode)."
(2)Turn the ignition switch to "ON" position.
(3)Operate the scan tool MB991958 to read the ETACS-ECU option coding information Coding List).
(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 11.
NO Go to Step 10.
STEP 10. Retest the system
Check that the audio sound is output.
Q. Is the check result normal?
YES The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Go to Step 11.
STEP 11. Retest the system
Temporarily replace the multivision display and check if the sound is output.
Q. Is the check result normal?
YES Replace the multivision display.
NO Perform Inspection Procedure 3 "No sound is heard from one of the speakers. [Vehicles without audio amplifier]" (Refer to Inspection Procedure 3.)