Component Tests and General Diagnostics

Navigation Communication Line Circuit Troubleshooting

1. Operate the climate control system in several modes.

Is the climate control system OK?

YES -

Go to step 2.

NO -

Do the Self-Diagnostic Function with the HDS or the climate control unit.

2. Do the System Links in Navigation System Diagnostic Mode.

Is the A/C icon red?

YES -

Go to step 3.

NO -

Go to step 9.

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

4. Disconnect audio-navigation unit connector D (12P).

5. Disconnect climate control unit 36P connector.

6. Check for continuity between the following terminals of climate control unit 36P connector and audio-navigation unit connector D (12P).









Is there continuity?

YES -

Go to step 7.

NO -

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

7. Check for continuity between body ground and climate control unit 36P connector terminals No. 8, No. 9, and No. 10 individually.





Is there continuity?

YES -

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

NO -

Go to step 8.

8. Reconnect climate control unit 36P connector.

9. Connect audio-navigation unit connector D (12P) terminals No. 1, No. 2, and No. 7 with jumper wires.





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

11. Press and hold the AUTO button, then press and hold the ON/OFF button.





Is the HEAT/VENT indicator solid with the remaining icons blinking?

YES -

Do the unit check with the navigation.

NO -

Substitute a known-good climate control unit, and recheck. If the symptom goes away, replace the original climate control unit Climate Control Unit Removal/Installation.