No Sound Is Heard From One of the Speakers. [Vehicles Without Audio Amplifier]

INSPECTION PROCEDURE 3: No Sound Is Heard From One Of The Speakers. [Vehicles Without Audio Amplifier]

CAUTION: Before replacing the radio and CD player, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

Speaker System Circuit (Part 1):

Speaker System Circuit (Part 2):

COMMENTS ON TROUBLE SYMPTOM
If the sound is not output from one of the speakers, the speaker, radio and CD player, communication line from the radio and CD player to the speakers may have a problem.

PROBABLE CAUSES
- The speaker may be defective
- The radio and CD player may be defective
- Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. ETACS-ECU coding data check.







1. Operate the scan tool to read the ETACS-ECU option coding information.
2. Check that the "Number of speaker" is set to "6 speakers".

Q: Is the check result normal?

YES : Go to Step 2.

NO : Operate the scan tool to set the option coding "Number of 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. Speaker Test [Vehicles With Radio and CD Player]

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.

NO (Either a speaker is abnormal) : Go to Step 3.

STEP 3. Check door speaker connector E-13 [front-LH], E-11 [front-RH], E-23 [rear-LH] or E-22 [rear-RH], or tweeter connector E-02 [LH] or E-04 [RH] for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is door speaker connector E-13 [front-LH], E-11 [front-RH], E-23 [rear-LH] or E-22 [rear-RH], or tweeter connector E-02 [LH] or E-04 [RH] in good condition?

YES : Go to Step 4.

NO : Repair or replace the damaged component(s).

STEP 4. Check the speaker or tweeter.

1. Remove the speaker or tweeter
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: Does the speaker or tweeter output the noise?

YES : Go to Step 5.

NO : Replace the speaker or tweeter.

STEP 5. Check radio and CD player connector C-107 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is radio and CD player connector C-107 in good condition?

YES : Go to Step 6.

NO : Repair or replace the damaged component.

STEP 6. Check the wiring harness between the speaker or tweeter connector terminal and the radio and CD player connector terminal.

- Check the communication lines for open circuit and short circuit.
- [Front door speaker (LH)] Check the wiring harness between front door speaker (LH) connector E-13 (terminal 1, 2) and radio and CD player connector C-107 (terminal 28, 38).

NOTE: Also check joint connector C-101 and intermediate connector C-128 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-101 or intermediate connector C-128 is damaged, repair or replace the connector.

- [Front door speaker (RH)] Check the wiring harness between front door speaker (RH) connector E-11 (terminal 1, 2) and radio and CD player connector C-107 (terminal 26, 36).

NOTE: Also check joint connector C-101 and intermediate connector C-116 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-101 or intermediate connector C-116 is damaged, repair or replace the connector.

- [Rear door speaker (LH)] Check the wiring harness between rear door speaker (LH) connector E-23 (terminal 1, 2) and radio and CD player connector C-107 (terminal 27, 37).

NOTE: Also check intermediate connectors D-24 and C-42 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-24 or C-42 is damaged, repair or replace the connector.

- [Rear door speaker (RH)] Check the wiring harness between rear door speaker (RH) connector E-22 (terminal 1, 2) and radio and CD player connector C-107 (terminal 25, 35).

NOTE: Also check intermediate connectors C-23 and D-01 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-23 or D-01 is damaged, repair or replace the connector.

- [Tweeter (LH)] Check the wiring harness between tweeter (LH) connector E-02 (terminal 1, 2) and radio and CD player connector C-107 (terminal 38, 28).

NOTE: Also check joint connector C-101 and intermediate connector C-129 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-101 or intermediate connector C-129 is damaged, repair or replace the connector.

- [Tweeter (RH)] Check the wiring harness between tweeter (RH) connector E-04 (terminal 1, 2) and radio and CD player connector C-107 (terminal 36, 26).

NOTE: Also check joint connector C-101 and intermediate connector C-117 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-101 or intermediate connector C-117 is damaged, repair or replace the connector.

Q: Is the wiring harness between the speaker or tweeter connector terminal and the radio and CD player connector terminal in good condition?

YES : Replace the radio and CD player.

NO : Repair or replace the damaged component(s).