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
- Malfunction of speaker
- Malfunctions of radio and CD player
- 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.(Refer to Coding Table).
2. Check that the "Number of speaker" is set to "6 speakers" or "4 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" or "4 speakers," and check the trouble symptom.

STEP 2. Checking with speaker test

Perform the speaker test, and check which speaker does not output the sound. Testing and Inspection

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 (abnormal for all) : Check the radio and CD player power supply and ground circuit, and repair if necessary. If the radio and CD player power supply and ground circuit is normal, replace the radio and CD player.

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-24 [rear-LH] or E-23 [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-24 [rear-LH] or E-23 [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-104 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is radio and CD player connector C-104 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-104 (terminal 28, 38).

NOTE: Also check joint connector C-03 and intermediate connector C-125 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-03 or intermediate connector C-125 is damaged, repair or replace the connector as described.

- [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-104 (terminal 26, 36).

NOTE: Also check joint connector C-03 and intermediate connector C-114 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-03 or intermediate connector C-114 is damaged, repair or replace the connector as described.

- [Rear door speaker (LH)] Check the wiring harness between rear door speaker (LH) connector E-24 (terminal 1, 2) and radio and CD player connector C-104 (terminal 27, 37).

NOTE: Also check intermediate connectors C-36 and D-20 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-36 or D-20 is damaged, repair or replace the connector as described.

- [Rear door speaker (RH)] Check the wiring harness between rear door speaker (RH) connector E-23 (terminal 1, 2) and radio and CD player connector C-104 (terminal 25, 35).

NOTE: Also check intermediate connectors C-21 and D-01 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-21 or D-01 is damaged, repair or replace the connector as described.

- [Tweeter (LH)] Check the wiring harness between tweeter (LH) connector E-02 (terminal 1, 2) and radio and CD player connector C-104 (terminal 38, 28).

NOTE: Also check joint connector C-03 and intermediate connector C-126 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-03 or intermediate connector C-126 is damaged, repair or replace the connector as described.

- [Tweeter (RH)] Check the wiring harness between tweeter (RH) connector E-04 (terminal 1, 2) and radio and CD player connector C-104 (terminal 36, 26).

NOTE: Also check joint connector C-03 and intermediate connector C-115 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-03 or intermediate connector C-115 is damaged, repair or replace the connector as described.

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).