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)

1. Remove the audio-HVAC subdisplay unit.
2. Check the connections at 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 ON (II).




4. Measure the voltage between audio-HVAC subdisplay unit 12P connector terminal No. 6 and the body ground.

Is there less than 0.5 V?

YES - Go to step 5.

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

5. Turn the ignition switch OFF.
6. Disconnect the audio unit connector C (28P) and audio-HVAC subdisplay unit 12P connector.




7. Check for continuity between audio unit connector C (28P) and audio-HVAC subdisplay unit 12P connector as shown.

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 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 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 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 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.