Inspection Procedure 2: No sound is heard.


caution Before replacing the radio and CD player, 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 radio and CD player may have a problem. In addition, if any of the speakers is short-circuited, the protection circuit inside the radio and CD player disables all the speakers to sound. Therefore, if all the speakers do not output sound, the speaker circuit may be shorted or the speaker may be defective.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

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

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 sound.) : Go to Step 2
NO (No sound is heard from one of the speakers.) : Go to Step 4

STEP 2. Check the speaker.
(1)Remove the speaker. Refer to .

(2)Check that the speaker outputs the noise when the voltage of 5 V is applied to the speaker connector terminal.

Q. Do the speaker output the noise?

Go to Step 3

Replace the speaker.

STEP 3. Check the wiring harness between the speaker connector terminal and the radio and CD player connector terminal.

  • Check of short circuit in DFR+, DFR- line front door speaker (RH) connector and radio and CD player connector. <Front door speaker (RH)>
  • Check of short circuit in DFL+, DFL- line front door speaker (LH) connector and radio and CD player connector. <Front door speaker (LH)>
  • Check of short circuit in RR+, RR- line rear door speaker (RH) connector and radio and CD player connector. <Rear door speaker (RH)>
  • Check of short circuit in RL+, RL- line rear door speaker (LH) connector and radio and CD player connector. <Rear door speaker (LH)>

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

STEP 4. Check the speaker.
Follow the speaker test to check which speaker does not sound.
(1)Remove the speaker. Refer to .

(2)Check that the speaker outputs the noise when the voltage of 5 V is applied to the speaker connector terminal.

Q. Do the speaker output the noise?

Go to Step 5

Replace the speaker.

STEP 5. Check the wiring harness between the speaker connector terminal and the radio and CD player connector terminal.
Follow the speaker test to check which speaker circuit is defective.

  • Check of open circuit in DFR+, DFR- line front door speaker (RH) connector and radio and CD player connector. <Front door speaker (RH)>
  • Check of open circuit in DFL+, DFL- line front door speaker (LH) connector and radio and CD player connector. <Front door speaker (LH)>
  • Check of open circuit in RR+, RR- line rear door speaker (RH) connector and radio and CD player connector. <Rear door speaker (RH)>
  • Check of open circuit in RL+, RL- line rear door speaker (LH) connector and radio and CD player connector. <Rear door speaker (LH)>

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.

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 radio and CD player.