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 with the HDS or the climate control unit.�

2. Do the Navi system link.

Is the Air-Con or TALK/BACK icon red?

YES -

- If Air-con icon is red, go to step 3.
- If TALK/BACK icon is red, go to "voice control does not work/respond" in the navigation system symptom troubleshooting Symptom Troubleshooting.�

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 (16P).

6. Check for continuity between the following terminals of climate control unit connector B (16P) 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 climate control unit connector B (16P) terminals No. 1, 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 (16P).

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

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





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.�