No Sound Is Heard From One of the Speakers. [Vehicles With Audio Amplifier]
Inspection Procedure 3: No Sound is Heard from one of the Speakers.Speaker System Circuit (Part 1):
Speaker System Circuit (Part 2):
Speaker System Circuit (Part 3):
COMMENTS ON TROUBLE SYMPTOM
If the sound is not heard from one of the speakers, the speaker, audio visual navigation unit, audio amplifier, communication line from the audio visual navigation unit to the audio amplifier, or communication line from the audio amplifier to the speaker may have a problem. Also, the option coding information may be inconsistent.
PROBABLE CAUSES
- Malfunction of speaker
- Malfunctions of audio visual navigation unit
- Malfunction of audio amplifier
- Option coding information inconsistency
- 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 scan tool MB991958 to read the ETACS-ECU option coding information (Refer to general (Body and Chassis) Coding Table).
2. Check that the "Speaker" is set to "Premium."
Q: Is the check result normal?
YES : Go to Step 2.
NO : Operate scan tool MB991958 to set the option coding "Speaker" to "Premium," 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. Service Mode
NOTE: In the following procedure, check the speaker, tweeter or subwoofer 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 Cope with Intermittent Malfunction).
NO (abnormal for all) : Refer to Inspection Procedure 2 "No sound is heard". Inspection Procedure 2
NO (Either a speaker, a tweeter or a subwoofer 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 (Refer to general (electrical), Harness Connector Inspection).
STEP 4. Check the speaker, tweeter or subwoofer.
1. Remove the speaker, tweeter or subwoofer.
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.
3. Check that the subwoofer outputs the noise when the voltage of 5 V is applied to the subwoofer connector terminal.
Q: Does the speaker, tweeter or subwoofer output the noise?
YES : Go to Step 5.
NO : Replace the speaker, tweeter or subwoofer.
STEP 5. Check audio amplifier connector D-125
Q: Is audio amplifier connector D-125
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 audio amplifier connector terminal.
Check the communication lines for open circuit.
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NOTE: Also check intermediate connectors C-22 and C-125 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-22 or C-125 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-22 and C-114 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-22 or 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 connector D-20 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector 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 connector D-01 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-01 is dam- aged, repair or replace the connector as described in general (electrical), Harness Connector Inspection.
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NOTE: Also check intermediate connectors C-22 and C-126 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-22 or C-126 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-22 and C-115 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-22 or C-115 is damaged, repair or replace the connector as described in general (electrical), Harness Connector Inspection.
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NOTE: Also check intermediate connector D-15 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-15 is damaged, repair or replace the connector as described in general (electrical), Harness Connector Inspection.
Q: Is the wiring harness between the speaker, tweeter or subwoofer connector terminal and the audio amplifier connector terminal in good condition?
YES
YES
NO (harness wire is abnormal) : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 7. Check audio visual navigation unit connector D-26 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is audio visual navigation unit connector D-26 in good condition?
YES : Go to Step 8.
NO : Repair or replace the damaged component (Refer to general (electrical), Harness Connector Inspection).
STEP 8. Check the wiring harness between audio visual navigation unit connector C-14 (terminal 3, 7, 12, 15) and audio amplifier connector D-26 (terminal 12, 11, 4, 15).
- Check the communication lines for open circuit.
NOTE: Also check intermediate connectors C-22 and C-105 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-22 or C-105 is damaged, repair or replace the connector as described in general (electrical), Harness Connector Inspection.
Q: Is the wiring harness between audio visual navigation unit connector C-14 (terminal 3, 7, 12, 15) and audio amplifier connector D-26 (terminal 12, 11, 4, 15) in good condition?
YES : Check the trouble symptom, go to Step 9.
NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
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?
YES : Replace the audio amplifier.
NO : Replace the audio visual navigation unit.