Audio Communication Line Circuit Troubleshooting (With Climate Control, With Navigation)

Audio Communication Line Circuit Troubleshooting

With Navigation

1. Disconnect the audio-HVAC subdisplay unit 12P connector.

2. Turn the ignition switch to ON (II).

3. Measure the voltage between audio-HVAC subdisplay unit 12P connector terminal No. 5 and body ground.





Is there battery voltage?

YES -

Go to step 4.

NO -

Repair an open in the wire between the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box and audio-HVAC subdisplay unit.

4. Turn the ignition switch to LOCK (0).

5. Disconnect climate control unit connector A (28P).

6. Check for continuity between the following terminals of climate control unit connector A (28P) and the audio-HVAC subdisplay unit 12P connector.









Is there continuity?

YES -

Go to step 7.

NO -

Repair an open in the wire(s) between climate control unit and the audio-HVAC subdisplay unit.

7. Check for continuity between body ground and climate control unit connector A (28P) terminals No. 19 and No. 20 individually.





Is there continuity?

YES -

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

NO -

Go to step 8.

8. Reconnect climate control unit connector A (28P).

9. Connect audio-HVAC subdisplay unit 12P connector terminals No. 7 and No. 8 with a jumper wire.





10. Turn the ignition switch to ON (II).

11. Press and hold the WINDSHIELD DEFROSTER button and the OFF button ('08-09 models) or the ON/OFF button ('10-12 models).

12. Check the WINDSHIELD DEFROSTER button LED.

Is the LED blinking?

YES -

Audio-HVAC subdisplay unit is faulty, replace the audio-HVAC subdisplay unit Audio-HVAC Subdisplay Unit Removal/Installation.

NO -

Climate control unit is faulty, replace the climate control unit Climate Control Unit Removal/Installation (With Navigation).