Inspection Procedure 2: No sound is heard.


caution Before replacing the multivision display, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM


If the audio sound is not output, the multivision display may have a problem. In addition, if any of the speakers or tweeters is short-circuited, the protection circuit inside the multivision display disables all the speakers or tweeters to sound. Therefore, if all the speakers do not output sound, the speaker or tweeter circuit may be shorted or the speaker or tweeter may be defective.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Checking with audio speaker test
Perform the audio speaker test, and check which speaker or tweeter does not output the sound.

Q. Is the check result normal?
YES : The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction).
NO (No speakers and tweeters sound.) : Go to Step 2.
NO (No sound is heard from one of the speakers or tweeters.) : Go to Step 4.

STEP 2. 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. Do the speaker output the noise?

Go to Step 3.

Replace the speaker or tweeter.

STEP 3. Check the wiring harness between the speaker or tweeter connector terminal and the smartphone link display audio connector terminal.
Front door speaker (LH)
    Check of short circuit in FL+, FL- line between front door speaker (LH) connector and smartphone link display audio connector.
Front door speaker (RH)
    Check of short circuit in FR+, FR- line between front door speaker (RH) connector and smartphone link display audio connector.
Front tweeter (LH)
    Check of short circuit in FL+, FL- line between front tweeter (LH) connector and smartphone link display audio connector.
Front tweeter (RH)
    Check of short circuit in FR+, FR- line between front tweeter (RH) connector and smartphone link display audio connector.
Rear door speaker (LH)
    Check of short circuit in RL+, RL- line between rear door speaker (LH) connector and smartphone link display audio connector.
Rear door speaker (RH)
    Check of short circuit in RR+, RR- line between rear door speaker (RH) connector and smartphone link display audio connector.

Q. Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness.

STEP 4. Check the speaker or tweeter.
Follow the speaker test to check which speaker or tweeter does not sound.
(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. Do the speaker output the noise?

Go to Step 5.

Replace the speaker or tweeter.

STEP 5. Check the wiring harness between the speaker or tweeter connector terminal and the smartphone link display audio connector terminal.
Follow the speaker test to check which speaker or tweeter circuit is defective.
Front door speaker (LH)
    Check of short circuit in FL+, FL- line between front door speaker (LH) connector and smartphone link display audio connector.
Front door speaker (RH)
    Check of short circuit in FR+, FR- line between front door speaker (RH) connector and smartphone link display audio connector.
Front tweeter (LH)
    Check of short circuit in FL+, FL- line between front tweeter (LH) connector and smartphone link display audio connector.
Front tweeter (RH)
    Check of short circuit in FR+, FR- line between front tweeter (RH) connector and smartphone link display audio connector.
Rear door speaker (LH)
    Check of short circuit in RL+, RL- line between rear door speaker (LH) connector and smartphone link display audio connector.
Rear door speaker (RH)
    Check of short circuit in RR+, RR- line between rear door speaker (RH) connector and smartphone link display audio connector.

Q. Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness.

STEP 6. Retest the system
Check if the sound is output from all the speakers or tweeters.

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).
Replace the multivision display (Refer to ).