Inspection Procedure 3: No sound is heard from one of the speakers. <Vehicles without audio amplifier>


caution Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.


















COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of speaker
  • Malfunctions of audio unit
  • 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 "Speaker" is set to "6 speakers".

Q. Is the check result normal?
Go to Step 2.
Operate the M.U.T.-III to set the option coding "Speaker" to "6 speakers", and check the trouble symptom.

STEP 2. 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?
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 (abnormal for all) : Check the audio unit power supply and earth circuit, and repair if necessary. If the audio unit power supply and earth circuit is normal, replace the audiovisual navigation unit.
NO (Either a speaker is abnormal) : Go to Step 3.

STEP 3. Connector check: E-16 <front-LH>, E-04 <front-RH>, E-23 <rear-LH> or E-09 <rear-RH> door speaker connector, E-13 <LH>, E-02 <RH> tweeter connector

Q. Is the check result normal?
Go to Step 4.
Repair the defective connector.

STEP 4. 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 5.
Replace the speaker or tweeter.

STEP 5. Connector check: C-18 audio unit connector.

Q. Is the check result normal?
Go to Step 6.
Repair the defective connector.

STEP 6. Check the wire harness between the speaker or tweeter connector terminal and the audio unit connector terminal.
Check the communication lines for open circuit.

  • <Front door speaker (LH)> Check the wire harness between E-16 front door speaker (LH) connector terminal No.1, 2 and C-18 audio unit connector terminal No.28, 38.
    note Prior to the wiring harness inspection, check intermediate connector C-113 <RH drive vehicles> or C-128 <LH drive vehicles>, and repair if necessary.
  • <Front door speaker (RH)> Check the wire harness between E-04 front door speaker (RH) connector terminal No.1, 2 and C-18 audio unit connector terminal No.26, 36.
    note Prior to the wiring harness inspection, check intermediate connector C-113 <LH drive vehicles> or C-128 <RH drive vehicles>, and repair if necessary.
  • <Rear speaker (LH) or rear door speaker (LH)> Check the wire harness between E-23 rear door speaker (LH) connector terminal No.1, 2 and C-18 audio unit connector terminal No.27, 37.
    note Prior to the wiring harness inspection, check intermediate connectors C-36 and D-23, and repair if necessary.
  • <Rear speaker (RH) or rear door speaker (RH)> Check the wire harness between E-09 rear door speaker (RH) connector terminal No.1, 2 and C-18 audio unit connector terminal No.25, 35.
    note Prior to the wiring harness inspection, check intermediate connectors C-24 and D-36, and repair if necessary.
  • <Tweeter (LH)> Check the wire harness between E-13 tweeter (LH) connector terminal No.1, 2 and C-18 audio unit connector terminal No.38, 28.
    note Prior to the wiring harness inspection, check intermediate connector C-114 <RH drive vehicles> or C-129 <LH drive vehicles>, and repair if necessary.
  • <Tweeter (RH)> Check the wire harness between E-02 tweeter (RH) connector terminal No.1, 2 and C-18 audio unit connector terminal No.36, 26.
    note Prior to the wiring harness inspection, check intermediate connector C-114 <LH drive vehicles> or C-129 <RH drive vehicles>, and repair if necessary.

Q. Is the check result normal?
Replace the audio unit.
Repair the wiring harness.