Audio Communication Line Circuit Troubleshooting

Audio Communication Line Circuit Troubleshooting

With Navigation

1. Disconnect climate control unit connector A (32P) and the audio-navigation switch panel 24P connector.

2. Check for continuity between the following terminals of climate control unit connector A (32P) and the audio-navigation switch panel 24P connector.









Is there continuity?

YES -

Go to step 3.

NO -

Repair an open in the wire between climate control unit connector A (32P) and the audio-navigation switch panel 24P connector.�

3. Check for continuity between body ground and climate control unit connector A (32P) terminals No. 3 and No. 4 individually.





Is there continuity?

YES -

Repair a short to body ground in the wire between climate control unit connector A (32P) and the audio-navigation switch panel 24P connector.�

NO -

Go to step 4.

4. Reconnect climate control unit connector A (32P).

5. Connect audio-navigation switch panel 24P connector terminals No. 7 and No. 19 with a jumper wire.





6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

7. Press and hold the front DEF button and OFF button.

Is the front DEF button LED blinking?

YES -

The audio-navigation switch panel is faulty, replace the audio-navigation switch panel Audio-Navigation Switch Panel Removal/Installation (With Navigation).�

NO -

The climate control unit is faulty, replace the climate control unit Climate Control Unit Removal/Installation.�

Without Navigation

8. Disconnect climate control unit connector A (32P) and the audio-HVAC display unit 12P connector.

9. Check for continuity between the following terminals of climate control unit connector A (32P) and the audio-HVAC display unit 12P connector.









Is there continuity?

YES -

Go to step 3.

NO -

Repair an open in the wire between climate control unit connector A (32P) and the audio-HVAC display unit 12P connector.�

10. Check for continuity between body ground and climate control unit connector A (32P) terminals No. 3 and No. 4 individually.





Is there continuity?

YES -

Repair a short to body ground in the wire between climate control unit connector A (32P) and the audio-HVAC display unit 12P connector.�

NO -

Go to step 4.

11. Reconnect climate control unit connector A (32P).

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





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

14. Press and hold the front DEF button and OFF button.

Is the front DEF button LED blinking?

YES -

The audio-HVAC display unit is faulty, replace the audio-HVAC display unit Audio-HVAC Display Unit Removal/Installation (Without Navigation).�

NO -

The climate control unit is faulty, replace the climate control unit Climate Control Unit Removal/Installation.�