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.CAUTION: Before replacing the ECU, 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, AM/FM radio and CD player, communication line from the AM/FM radio and CD player to the speakers may have a problem.
PROBABLE CAUSES
- Malfunction of speaker
- Malfunctions of radio and CD player or CD changer
- 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 general (Body and Chassis) Coding Table).
2. Check that the "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 "Speaker" to "6 speakers" or "4 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. 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 (Refer to general (Body and Chassis) How to use Troubleshooting/inspection Service Points How to Cope with Intermittent Malfunction).
NO (abnormal for all) : Check the radio and CD player or CD changer power supply and ground circuit, and repair if necessary. If the radio and CD player or CD changer power supply and ground circuit is normal, replace the audiovisual navigation unit.
NO (Either a speaker is abnormal) : Go to Step 3.
STEP 3. Check door speaker connector E-13
Q: Is door speaker connector E-13
YES : Go to Step 4.
NO : Repair or replace the damaged component(s) (Refer to general (electrical) Harness Connector Inspection).
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 or CD changer connector C-104 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is radio and CD player or CD changer connector C-104 in good condition?
YES : Go to Step 6.
NO : Repair or replace the damaged component (Refer to general (electrical), Harness Connector Inspection).
STEP 6. Check the wiring harness between the speaker or tweeter connector terminal and the radio and CD player or CD changer connector terminal.
Check the communication lines for open circuit.
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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 in general (electrical) Harness Connector Inspection.
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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 in general (electrical) Harness Connector Inspection.
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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 in general (electrical) Harness Connector Inspection.
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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 in general (electrical) Harness Connector Inspection.
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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 in general (electrical), Harness Connector Inspection.
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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 in general (electrical) Harness Connector Inspection.
Q: Is the wiring harness between the speaker or tweeter connector terminal and the radio and CD player or CD changer connector terminal in good condition?
YES : Replace the radio and CD player or CD changer.
NO : Repair or replace the damaged component(s). Refer to general (electrical), Harness Connector Inspection.