Inspection Procedure 9

Inspection Procedure 9: The sound of external input are not played.

CAUTION: Before replacing the radio and CD player, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

Aux Adapter Circuit (Part 1):

Aux Adapter Circuit (Part 2):

COMMENTS ON TROUBLE SYMPTOM
If the external input sound is not output, the radio and CD player or radio and CD player with CD changer, audio communication line of radio and CD player or radio and CD player with CD changer, or audio adapter may have a problem.

PROBABLE CAUSES
- The audio adapter may be defective.
- The radio and CD player or radio and CD player with CD changer may be defective.
- Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check the Radio and CD player or radio and CD player with CD changer.

Check that the Radio and CD player or radio and CD player with CD changer operates normally, and the sound is output.

Q: Is the check result normal?

YES : Go to Step 2.

NO : Troubleshoot the radio and CD player or radio and CD player with CD changer (Refer to Audio System Diagnostic Troubleshooting Strategy).

STEP 2. Check the AUX mode.

Check if the AUX mode of the radio and CD player or radio and CD player with CD changer is set.

Q: Is the check result normal?

YES : Go to Step 3.

NO : Set the AUX mode.

STEP 3. Check the AUX adapter.

Check if the AUX adapter is normal. (Refer to Testing and Inspection.)

Q: Is the check result normal?

YES : Go to step 4.

NO : Replace the AUX adapter.

STEP 4. Check that the AUX adapter and the AUX box are connected to the DIN cable normally.

Q: Are they connected to the DIN cable normally?

YES : Go to Step 5.

NO : Repair the connection.

STEP 5. Check if the DIN cable is damaged.

Q: Is the DIN cable damaged or bent?

YES : Repair or replace the DIN cable.

NO : Go to Step 6.

STEP 6. Check AUX adapter connector C-139 and AUX box connector C-138 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Are AUX adapter connector C-139 and AUX box connector C-138 in good condition?

YES : Go to step 7.

NO : Repair or replace the damaged component(s).

STEP 7. Check the wiring harness between AUX adapter connector C-139 (terminal 5, 4, 6) and AUX box connector C-138 (terminal 4, 1, 2).







- Check the communication lines for open circuit and short circuit.

NOTE: Also check intermediate connector C-21 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-21 is damaged, repair or replace the connector.

Q: Is the wiring harness between AUX adapter connector C-139 (terminal 5, 4, 6) and AUX box connector C-138 (terminal 4, 1, 2) in good condition?

YES : Replace the audio adapter, and go to Step 8.

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 8. Replace the radio and CD player or radio and CD player with CD changer temporarily, and check the trouble symptom.

Replace the radio and CD player or radio and CD player with CD changer temporarily, and check that the sound is output from the speaker.

Q: Is the check result normal?

YES : Replace the radio and CD player or radio and CD player with CD changer.

NO : Replace the AUX box.