Inspection Procedure 11

Inspection Procedure 11: The picture and sound of external input are not played.

Audio And Video Adapter Communication Circuit:

DIAGNOSIS

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

STEP 1. Check of DVD picture

Check that the DVD picture is displayed normally.

Q: Is the check result normal?

YES : Go to Step 2.

NO : Perform the troubleshooting related to the MMCS. Trouble Symptom Chart

STEP 2. Check audio navigation unit connector C-12 and audio and video adaptor connector C-121 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are audio navigation unit connector C-12 and audio and video adaptor connector C-121 in good condition?

YES : Go to Step 3.

NO : Repair the connector concerned.

STEP 3. Check the wiring harness between audio visual navigation unit connector C-12 (terminal 47, 48, 49, 63, 64) and audio and video adaptor connector C-121 (terminal 1, 6, 5, 4, 2).

- Check the communication lines for open circuit.

NOTE: Also check intermediate connectors C-103 and C-107 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-103 or C-107 is damaged, repair or replace the connector as described in general (electrical), Harness Connector Inspection.

Q: Is the wiring harness between audio visual navigation unit connector C-12 (terminal 47, 48, 49, 63, 64) and audio and video adaptor connector C-121 (terminal 1, 6, 5, 4, 2) in good condition?

YES : Replace the audio and video adapter.

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. The system should communicate with the CAN box unit normally.

STEP 4. 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 general (Body and Chassis), How to use Troubleshooting/inspection Service Points, How to Cope with Intermittent Malfunction).

NO : Replace the rear display unit.