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 -

Disconnect audio-navigation unit connector D (20P), then go to step 9.

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

4. Disconnect audio-navigation unit connector D (20P).

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 (20P).









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. 31, No. 32, and No. 33 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 (20P) terminals No. 5, No. 6, and No. 15 with jumper wires.





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

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





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

YES -

Do the Unit check with the audio-navigation system.

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.