Inspection Procedure 3: No Sound is Heard from One of The Speakers. <Vehicles with audio amplifier>


caution Before replacing the radio and CD player, 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 radio and CD player
  • 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 List ).
(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 "Number of speaker," 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?
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 3.

STEP 3. 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 4.
Repair the defective connector.

STEP 4. 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 5.
Replace the speaker, tweeter or subwoofer.

STEP 5. 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 6.
Repair the defective connector.

STEP 6. 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 connectors 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.

Q. Is the check result normal?
Go to Step 7.
Repair the wiring harness.

STEP 7. Connector check: C-103 radio and CD player connector

Q. Is the check result normal?
Go to Step 8.
Repair the defective connector.

STEP 8. Check the harness wire between C-103 radio and CD player connector terminal No.26, 28, 36, 38, 24 and D-27 audio amplifier connector No.10, 4, 11, 12, 9.

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

Q. Is the check result normal?
Go to Step 9.
Repair the wiring harness.

STEP 9. Replace the audio amplifier temporarily, and check the trouble symptom.
Replace the audio amplifier temporarily, and check that the sound is output from the speaker.

Q. Is the check result normal?
Replace the audio amplifier.
Replace the radio and CD player.