Inspection Procedure 3: Not Sound is Heard from one of the Speakers. <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



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

DIAGNOSIS PROCEDURE

STEP 1. 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 2.
Operate the M.U.T.-III to set the option coding "Number of speaker" to "Premium," 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 for the MMCS service mode. (Refer to )
(2)Check if "PREMIUM" is displayed.

Q. Is the check result normal?
Go to Step 3.
Go to Step 4.

STEP 3. 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 4.
Go to Step 7.

STEP 4. 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 5.
Repair the CAN bus line.

STEP 5. Check whether the diagnosis code is set.
Check if the diagnosis code is set to the CAN box unit.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.

Q. Is the diagnosis code set?
Troubleshoot the MMCS (Refer to ).
Go to Step 6.

STEP 6. 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 7.

STEP 7. Checking with audio speaker check
Perform the audio speaker check, and check which speaker does not output the sound (Refer to ).
note In the following procedure, check the speaker, tweeter or subwoofer that is abnormal.

Q. Is the check result normal?
YES (normal for all) : The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
NO (Either a speaker, a tweeter or a subwoofer is abnormal) : Go to Step 8.

STEP 8. Connector check: E-12 <front-LH>, E-10 <front-RH>, E-22 <rear-LH> or E-21 <rear-RH> door speaker connector, E-02 <LH>, E-04 <RH> tweeter connector, F-25 subwoofer connector

Q. Is the check result normal?
Go to Step 9.
Repair the defective connector.

STEP 9. Check the speaker, tweeter or subwoofer.
(1)Remove the speaker, tweeter or subwoofer. Refer to .
(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?
Go to Step 10.
Replace the speaker, tweeter or subwoofer.

STEP 10. Connector check: D-26 <front door speaker or sub woofer>, D-27 <tweeter or rear door speaker> audio amplifier connector

Q. Is the check result normal?
Go to Step 11.
Repair the defective connector.

STEP 11. Check the wire harness between the speaker or tweeter connector terminal and the audio amplifier connector terminal.
Check the communication lines for open circuit or short circuit.

  • <Front door speaker (LH)> Check the wire harness between E-12 front door speaker (LH) connector terminal No.1, 2 and D-26 audio amplifier connector terminal No.28, 38.
    note Prior to the wiring harness inspection, check intermediate connectors C-17 and C-125, and repair if necessary.
  • <Front door speaker (RH)> Check the wire harness between E-10 front door speaker (RH) connector terminal No.1, 2 and D-26 audio amplifier connector terminal No.27, 37.
    note Prior to the wiring harness inspection, check intermediate connectors C-17 and C-111, and repair if necessary.
  • <Rear door speaker (LH)> Check the wire harness between E-22 rear door speaker (LH) connector terminal No.1, 2 and D-27 audio amplifier connector terminal No.1, 7.
    note Prior to the wiring harness inspection, check intermediate connector D-21, and repair if necessary.
  • <Rear door speaker (RH)> Check the wire harness between E-21 rear door speaker (RH) connector terminal No.1, 2 and D-27 audio amplifier connector terminal No.2, 8.
    note Prior to the wiring harness inspection, check intermediate connector D-01, and repair if necessary.
  • <Tweeter (LH)> Check the wire harness between E-02 tweeter (LH) connector terminal No.1, 2 and D-27 audio amplifier connector terminal No.14, 6.
    note Prior to the wiring harness inspection, check intermediate connectors C-17 and C-126, and repair if necessary.
  • <Tweeter (RH)> Check the wire harness between E-04 tweeter (RH) connector terminal No.1, 2 and D-27 audio amplifier connector terminal No.13, 5.
    note Prior to the wiring harness inspection, check intermediate connectors C-17 and C-112, and repair if necessary.
  • <Subwoofer> Check the wire harness between F-25 subwoofer connector terminal No.1, 2, 3, 4 and D-26 audio amplifier connector terminal No.30, 22, 29, 21.
    note Prior to the wiring harness inspection, check intermediate connector D-17, and repair if necessary.

Q. Is the check result normal?
YES <front door speaker> : Go to Step 12.
YES <except front door speaker> : Go to Step 14.
NO (harness wire is abnormal) : Repair the wiring harness.

STEP 12. Connector check: C-144 multivision display connector

Q. Is the check result normal?
Go to Step 13.
Repair the defective connector.

STEP 13. Check the harness wire between C-144 multivision display connector terminal No.3, 7, 12, 15 and D-27 audio amplifier connector No.12, 11, 4, 10.

  • Check the communication lines for open circuit or short circuit.
note Prior to the wiring harness inspection, check intermediate connectors C-139 and C-17, and repair if necessary.

Q. Is the check result normal?
Check the trouble symptom, go to Step 14.
Repair the wiring harness.

STEP 14. 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?
Replace the multivision display.
Replace the audio amplifier..