Inspection Procedure 3: Not Sound is Heard from one of the Speakers. <Vehicles without 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 or tweeter
  • Malfunction of multivision display
  • 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 List ).
(2)Check that the result matches with the number of speakers ("6 speakers" or "4 speakers") specified by "Number of speaker."

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 "6 speakers" or "4 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 for the MMCS service mode. (Refer to .)
(2)Check if "6SPEAKER(2TWEETER) or 4SPEAKER" is displayed as the number of installed speakers.

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 or tweeter that is abnormal.

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 ).
NO (Either a speaker 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

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

STEP 9. Check the speaker or tweeter.
(1)Remove the speaker or tweeter (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.

Q. Is the check result normal?
Go to Step 10.
Replace the speaker or tweeter.

STEP 10. Connector check: C-144 multivision display 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 multivision display 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 C-144 multivision display connector terminal No.12, 3.
    note Prior to the wiring harness inspection, check intermediate connectors C-125 and C-139, joint connector C-39, 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 C-144 multivision display connector terminal No.15, 7.
    note Prior to the wiring harness inspection, check intermediate connectors C-111 and C-139, joint connector C-39, 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 C-144 multivision display connector terminal No.11, 2.
    note Prior to the wiring harness inspection, check intermediate connectors C-139, C-28 and 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 C-144 multivision display connector terminal No.16, 8.
    note Prior to the wiring harness inspection, check intermediate connectors C-139, C-16 and D-01, and repair if necessary.
  • <Tweeter (LH)> Check the wire harness between E-02 tweeter (LH) connector terminal No.2, 1 and C-144 multivision display connector terminal No.12, 3.
    note Prior to the wiring harness inspection, check intermediate connectors C-126 and C-139, joint connector C-39, and repair if necessary.
  • <Tweeter (RH)> Check the wire harness between E-04 tweeter (RH) connector terminal No.2, 1 and C-144 multivision display connector terminal No.15, 7.
    note Prior to the wiring harness inspection, check intermediate connectors C-112 and C-139, joint connector C-39, and repair if necessary.

Q. Is the check result normal?
Go to Step 12.
Repair the wiring harness.

STEP 12. Check of the troubles
Check if the sound is output from all the speakers normally.

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 ).
Go to Step 13.

STEP 13. Check of the troubles
Temporarily replace the multivision display, and check if the sound is output.

Q. Is the check result normal?
Replace the multivision display.
Replace the faulty speaker or tweeter.