Inspection Procedure 11

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

CAUTION: Whenever the audio visual navigation unit is replaced, ensure that the power supply circuit and the grounding circuit are normal. (Check that the voltage is 10 V or more.)

Audio And Video Adapter Communication Circuit:

COMMENTS ON TROUBLE SYMPTOM
The wiring harness between audio and video adapter and audio visual navigation unit, audio and video adapter, or audio visual navigation unit may have a problem.

NOTE: Problem of the device to be connected and the connection problem between the audio and video adapter and the device is suspected. Thus, check the operation condition and connecting method of the devices to be connected to the audio visual navigation unit and audio and video adapter before diagnosis.

PROBABLE CAUSES
- The audio visual navigation unit may be defective
- The audio and video adaptor may be defective
- Damaged harness wires and connectors

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 the audio and video adapter.

Inspect the audio and video adapter.

Q: Is the check result normal?

YES : Go to Step 3.

NO : Replace the audio and video adapter.

STEP 3. 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 4.

NO : Repair the connector concerned.

STEP 4. 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 and short 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.

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 : Go to Step 5.

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 5. Retest the system

Check that the external input is normal.

Q: Is the check result normal?

YES : The trouble can be an intermittent malfunction.

NO : Replace the audio and video adaptor.