Audio Communication Line Circuit Troubleshooting

Audio Communication Line Circuit Troubleshooting

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

2. Disconnect climate control unit connector B (16P) and audio unit connector C (28P).

3. Check for continuity between climate control unit connector B (16P) terminal No. 11 and audio unit connector C (28P) terminal No. 15.





Is there continuity?

YES -

Go to step 4.

NO -

Repair an open in the wire between climate control unit connector B (16P) and audio unit connector C (28P).�

4. Check for continuity between body ground and climate control unit connector B (16P) terminal No. 11.





Is there continuity?

YES -

Repair a short to body ground in the wire between climate control unit connector B (16P) and audio unit connector C (28P).�

NO -

Go to step 5.

5. Reconnect climate control unit connector B (16P).

6. Disconnect the in-car temperature sensor 2P connector Service and Repair.

7. Connect climate control unit connector B (16P) terminals No. 11 and No. 14 with a jumper wire.





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

9. Press and hold the DEF button and OFF button.

Is the DEF button LED blinking?

YES -

Audio unit is faulty, replace the audio unit Audio Unit Removal/Installation (With Navigation System).�

NO -

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