Navigation Communication Line Circuit Troubleshooting (With Navigation)

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 Initial Inspection and Diagnostic Overview or climate control unit. Initial Inspection and Diagnostic Overview


2. Do the Navi system link.

Is the Air-Con icon red?
YES -
- '06-08 models: Go to step 3.

- '09 model: Go to step 7.


NO - Go to step 13.


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

4. Disconnect navigation unit connector F (5P).

5. Disconnect climate control unit connector A (32P).

6. Check for continuity between the following terminals of climate control unit connector A (32P) and navigation unit connector F (5P).





Is there continuity?
YES - Go to step 11.

NO - Repair open in the wire(s) between the climate control unit and the navigation unit.






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

8. Disconnect navigation unit connector D (12P).

9. Disconnect climate control unit connector A (32P).

10. Check for continuity between the following terminals of climate control unit connector A (32P) and navigation unit connector D (12P).





Is there continuity?
YES - Go to step 11.

NO - Repair open in the wire(s) between the climate control unit and the navigation unit.






11. Check for continuity between body ground and climate control unit connector A (32P) terminals No. 28, 29, and No. 30 individually.

Is there continuity?
YES - Repair short to body ground in the wire(s) between the climate control unit and the navigation unit.

NO - Go to step 12.






12. Reconnect climate control unit connector A (32P).

13. '06-08 models: Disconnect navigation unit connector F (5P).
'09 model: Disconnect navigation unit connector D (12P).

14. Connect climate control unit connector A (32P) terminals No. 28, 29, and No. 30 with a jumper wire.

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

16. Press the RECIRCULATION and OFF buttons.

Does the RECIRCULATION indicator turn on?
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