Navigation Communication Line Circuit Troubleshooting

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 Navi system link.

Is the A/C or TALK/BACK icon red?

YES -

- A/C icon is red, go to step 3.
- If other icon is red, check navigation system error code (DTCs).�

NO -

Go to step 9.

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

4. Disconnect navigation unit connector B (32P).

5. Disconnect climate control unit connector B (20P).

6. Check for continuity between the following terminals of climate control unit connector B (20P) and navigation unit connector B (32P).









Is there continuity?

YES -

Go to step 7.

NO -

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

7. Check for continuity between body ground and the climate control unit connector B (20P) terminals No. 2, 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 navigation unit.�

NO -

Go to step 8.

8. Reconnect climate control unit connector B (20P).

9. Disconnect navigation unit connector B (32P).

10. Connect the navigation unit connector B (32P) terminals No. 4, No. 20, and No. 21 with jumper wires.






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

12. 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 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.�