Inspection Procedure 6: The sound of external input are not played: Diagnosis

WARNING: This page is about a different variant/trim than selected.

Required Special Tools:

MB991223: Harness Set
MB992006: Extra Fine Probe

STEP 1. Check the Radio and CD player.
Check that the Radio and CD player 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 (Refer to TROUBLE SYMPTOM CHART ).
STEP 2. Check the external sound input mode.
Check if the external sound input mode of the radio and CD player is set.

Q: Is the check result normal?
- YES: Go to Step 3.
- NO: Set the external sound input mode.
STEP 3. Check the audio adapter.
Check if the audio adapter is normal. (Refer to AUDIO ADAPTER INSPECTION .)
Q: Is the check result normal?
- YES: Go to Step 4.
- NO: Replace the Audio adapter.
STEP 4. Check audio adapter connector C-125 and radio and CD player connector C-109 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are audio adapter connector C-125 and radio and CD player connector C-109 in good condition?
- YES: Go to Step 5.
- NO: Repair or replace the damaged component(s) (Refer to HARNESS CONNECTOR INSPECTION ).
STEP 5. Check the wiring harness between audio adapter connector C-125 (terminal 5, 4, 6) and radio and CD player connector C-109 (terminal 14, 13, 4).
- Check the communication lines for open circuit and short circuit.
  Q: Is the wiring harness between audio adapter connector C-125 (terminal 5, 4, 6) and radio and CD player connector C-109 (terminal 14, 13, 4) in good condition?
  - YES: Replace the audio adapter, and go to Step 6.
  - 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 6. Retest the system.
Check that the external input is normal.

Q: Is the check result normal?
- YES: The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
- NO: Replace the radio and CD player.