Inspection Procedure 2: No sound is heard. <Vehicles without audio amplifier>


caution Whenever the multivision display is replaced, ensure that the power supply circuit and the earthing circuit are normal. (Check that the voltage is 10 V or more.)

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 6.

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 or tweeter output the noise?

YES <Except ERA-GLONASS SYSTEM> : Go to Step 5.

YES <ERA-GLONASS SYSTEM> : Go to Step 3.

Replace the speaker or tweeter.

STEP 3. Check the wiring harness between the e-Call relay box connector terminal and the multivision display connector terminal.
Check of short circuit in FR+, FR- line e-Call relay box connector and multivision display connector.

Q. Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness. Then go to Step 5.

STEP 4. Check the wiring harness between the front door speaker (RH) connector terminal and the e-Call relay box connector terminal.
Check of short circuit in FR+, FR- line front door speaker (RH) connector and e-Call relay box connector.

Q. Is the check result normal?
Replace the e-Call relay box (Refer to ). Then go to Step 5.
Repair the connector(s) or wiring harness. Then go to Step 5.

STEP 5. Check the wiring harness between the speaker or tweeter connector terminal and the multivision display connector terminal.

  • Check of short circuit in FR+, FR- line front door speaker (RH) connector and multivision display connector. <Front door speaker (RH) except ERA-GLONASS SYSTEM>
  • Check of short circuit in FL+, FL- line front door speaker (LH) connector and multivision display connector. <Front door speaker (LH)>
  • Check of short circuit in RR+, RR- line rear door speaker (RH) connector and multivision display connector. <Rear door speaker (RH)>
  • Check of short circuit in RL+, RL- line rear door speaker (LH) connector and multivision display connector. <Rear door speaker (LH)>
  • Check of short circuit in FR+, FR- line tweeter (RH) connector and multivision display connector. <Tweeter (RH)>
  • Check of short circuit in FL+, FL- line tweeter (LH) connector and multivision display connector. <Tweeter (LH)>

Q. Is the check result normal?
Go to Step 10.
Repair the connector(s) or wiring harness.

STEP 6. Check the speaker or tweeter.
Follow the speaker or tweeter 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 connector terminal.

Q. Do the speaker or tweeter output the noise?

YES <Except ERA-GLONASS SYSTEM> : Go to Step 9.

YES <ERA-GLONASS SYSTEM> : Go to Step 7.

Replace the speaker or tweeter.

STEP 7. Check the wiring harness between the e-Call relay box connector terminal and the multivision display connector terminal.
Check of short circuit in FR+, FR- line e-Call relay box connector and multivision display connector.

Q. Is the check result normal?
Go to Step 8.
Repair the connector(s) or wiring harness. Then go to Step 9.

STEP 8. Check the wiring harness between the front door speaker (RH) connector terminal and the e-Call relay box connector terminal.
Check of short circuit in FR+, FR- line front door speaker (RH) connector and e-Call relay box connector.

Q. Is the check result normal?
Replace the e-Call relay box (Refer to ). Then go to Step 9.
Repair the connector(s) or wiring harness. Then go to Step 9.

STEP 9. Check the wiring harness between the speaker or tweeter connector terminal and the multivision display connector terminal.
Follow the speaker test to check which speaker or tweeter circuit is defective.

  • Check of open circuit in FR+, FR- line front door speaker (RH) connector and multivision display connector. <Front door speaker (RH) except ERA-GLONASS SYSTEM>
  • Check of open circuit in FL+, FL- line front door speaker (LH) connector and multivision display connector. <Front door speaker (LH)>
  • Check of open circuit in RR+, RR- line rear door speaker (RH) connector and multivision display connector. <Rear door speaker (RH)>
  • Check of open circuit in RL+, RL- line rear door speaker (LH) connector and multivision displayer connector. <Rear door speaker (LH)>
  • Check of open circuit in FR+, FR- line tweeter (RH) connector and multivision display connector. <Tweeter (RH)>
  • Check of open circuit in FL+, FL- line tweeter (LH) connector and multivision display connector. <Tweeter (LH)>

Q. Is the check result normal?
Go to Step 10.
Repair the connector(s) or wiring harness.

STEP 10. 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.