Audio System Information Does Not Display on the Audio-HVAC Subdisplay Unit (With ELS Audio System)

Audio system information does not display on the audio-HVAC subdisplay unit (with ELS audio system)

NOTE:
- Check the vehicle battery condition first.
- Always check the connectors for poor connection or loose terminals.

1. Remove the audio-HVAC subdisplay unit.
2. Check the connections at the audio-HVAC subdisplay unit 12P connector and audio unit connector C (28P).

Are the connectors and terminals connected properly?

YES - Go to step 3.

NO - Repair the connection and recheck.

3. Turn the ignition switch to ON (II).
4. Measure the voltage between audio-HVAC subdisplay unit 12P connector No. 6 terminal and body ground.






Is there less than 0.1 V?

YES - Go to step 5.

NO - Repair open in the wire between audio-HVAC subdisplay unit 12P connector No. 6 terminal and body ground (G502).

5. Turn the ignition switch to LOCK (0).
6. Disconnect the audio unit connector C (28P) and the audio-HVAC subdisplay unit 12P connector.
7. Check for continuity between audio unit connector C (28P) and the audio-HVAC subdisplay unit 12P connector according to the table.






Is there continuity?

YES - Go to step 8.

NO - Repair open in the wire(s) between the audio unit and audio-HVAC subdisplay unit.

8. Check for continuity between the audio-HVAC subdisplay unit 12P connector and body ground as shown.






Is there continuity?

YES - Repair short to body ground in the wire(s) between the audio unit and audio-HVAC subdisplay unit.

NO - Go to step 9.

9. Check for continuity between audio unit connector C (28P) and the audio-HVAC subdisplay unit 12P connector according to the table.






Is there continuity?

YES - Go to step 10.

NO - Repair open in the wire(s) between the audio unit and audio-HVAC subdisplay unit.

10. Check for continuity between the audio-HVAC subdisplay unit 12P connector and body ground according to the table.






Is there continuity?

YES - Repair short to body ground in the wire(s) between the audio unit and audio-HVAC subdisplay unit.

NO - Go to step 11.

11. Check for continuity between the terminals of the audio-HVAC subdisplay unit 12P connector according to the table.






Is there continuity between any of the terminals?

YES - Repair short in the wire(s) between the audio unit and audio-HVAC subdisplay unit (replace the appropriate shielded harness).

NO - Substitute a known-good audio unit and recheck. If the symptom/indication goes away, replace the original audio unit. If the symptom is still present, substitute a known-good audio-HVAC subdisplay unit and recheck. If the symptom/indication goes away, replace the original audio-HVAC subdisplay unit.