Inspection Procedure 2: No Sound is Heard. <Vehicles with Audio Amplifier>


caution Whenever the multivision display is replaced, ensure that the power supply circuit and the earthing circuit are normal. (Check that the voltage is 10 V or more.)








COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunctions of multivision display
  • Malfunction of audio amplifier
  • Option coding information inconsistency
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

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 "Poor Reception."(Refer to .)
No sound only when the CD is played : Perform Inspection Procedure 8 "CD/DVD cannot be played." (Refer to .)
No sound only when the DVD is played : Perform Inspection Procedure 8 "CD/DVD cannot be Played." (Refer to .) Or, perform Inspection Procedure 9 "Image of a DVD is Played, but no Sound is Played."(Refer to .)
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. ETACS-ECU coding data check
(1)Operate the M.U.T.-III to read the ETACS-ECU option coding information (Refer to GROUP 00 - Coding Table ).
(2)Check that the "Number of speaker" is set to "Premium".

Q. Is the check result normal?
Go to Step 3
Operate the M.U.T.-III to set the option coding "Number of 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 for the MMCS service mode. (Refer to )
(2)Check if "PREMIUM" is displayed as the number of installed speakers.

Q. Is the check result normal?
Go to Step 4.
Go to Step 5.

STEP 4. Check the service data log for the MMCS service mode.
Display the service data log for the MMCS service mode and check if the service data log for the SP (speaker) is displayed. (Refer to )

Q. Is the service data log for the SP (speaker) displayed?
Go to Step 5.
Go to Step 8.

STEP 5. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 6
Repair the CAN bus line.

STEP 6. Check whether the diagnosis code is set.
Check if the diagnosis code is set to the CAN box unit.
(1)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(2)Check if diagnosis code is set.

Q. Is the diagnosis code set?
Troubleshoot the MMCS (Refer to ).
Go to Step 7

STEP 7. M.U.T.-III other system diagnosis code
Check if the diagnosis code is set to the ETACS-ECU.

Q. Is the diagnosis code set?
Diagnose the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU - Troubleshooting ).
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)
(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 .) Or, perform Inspection Procedure 9 "Image of a DVD is Played, but no Sound is Played."(Refer to .) 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
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)
(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?
Go to Step 17
Go to Step 10

STEP 10. Connector check: D-26 audio amplifier connector

Q. Is the check result normal?
Go to Step 11
Repair or replace the damaged component(s).

STEP 11. Resistance measurement at D-26 audio amplifier connector.
(1)Disconnect audio amplifier connector D-26, and measure the resistance available at the wiring harness side of the connector.
(2)Check the continuity between terminal No.24 and body earth.
OK: Continuity exists (2 ohms or less)
(3)Check the continuity between terminal No.31 and body earth.
OK: Continuity exists (2 ohms or less)
(4)Check the continuity between terminal No.32 and body earth.
OK: Continuity exists (2 ohms or less)

Q. Is the check result normal?
Go to Step 13
Go to Step 12

STEP 12. Check the wiring harness between D-26 audio amplifier connector terminal No.24, 31, 32 and body earth.

  • Check the body earth wires for open circuit.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the wiring harness.

STEP 13. Voltage measurement at D-26 audio amplifier connector.
(1)Disconnect D-26 audio amplifier connector, and measure the voltage available at the wiring harness-side connector.
(2)Measure the voltage between terminal No.25 and body earth.
OK: System voltage
(3)Measure the voltage between terminal No.35 and body earth.
OK: System voltage
(4)Measure the voltage between terminal No.36 and body earth.
OK: System voltage

Q. Is the check result normal?
Go to Step 15
Go to Step 14

STEP 14. Check the wiring harness between D-26 audio amplifier connector terminal No.25, 35, 36 and fusible link (36) <PETROL, RALLIART> or (38) <DIESEL>.
note Prior to the wiring harness inspection, check intermediate connector C-31, and repair if necessary.

  • Check the power supply lines for open circuit and short circuit.

Q. Is the check result normal?
Go to Step 15
Repair the wiring harness.

STEP 15. Connector check: C-141 multivision display connector and D-27 audio amplifier connector

Q. Is the check result normal?
Go to Step 16
Repair the defective connector.

STEP 16. Check the wiring harness between C-141 multivision display connector terminal No.82 and D-27 audio amplifier connector terminal No.3.
note Prior to the wiring harness inspection, check intermediate connectors C-17 and C-140, and repair if necessary.

  • Check the communication line for open circuit or short circuit.

Q. Is the check result normal?

    Go to Step 17
Repair the wiring harness.

STEP 17. Connector check: C-144 multivision display connector

Q. Is the check result normal?
Go to Step 18
Repair the defective connector.

STEP 18. Check the wiring harness between C-144 multivision display connector terminal No.6 and D-26 audio amplifier connector terminal No.34.
note Prior to the wiring harness inspection, check intermediate connectors C-17 and C-140, and repair if necessary.

  • Check the communication line for open circuit or short circuit.

Q. Is the check result normal?

    Go to Step 19
Repair the wiring harness.

STEP 19. Retest the system
Check that the audio sound is output.

Q. Is the check result normal?
This diagnosis is complete.
Go to Step 20

STEP 20. Retest the system
Temporarily replace the multivision display, and check if the sound is output.

Q. Is the check result normal?
Replace the multivision display.
Replace the audio amplifier.