Manufacturer Code Charts: 2703

Navigation System DTC Troubleshooting: 1501, 2703

DTC 1501:

Aircon System Error

DTC 2703:

Aircon Diag

NOTE:

- Check the vehicle battery condition first Testing and Inspection.
- Check any official Honda service website for more service information about the navigation system.
- Check for B-CAN DTCs and resolve them before troubleshooting.
- These navigation DTCs set when a common error between the climate control unit and the navigation unit (open or short) is detected.
- When the ignition switch is in ACCESSORY (I), the A/C unit is turned off. The navigation loses communication with the A/C unit and stores DTC 1501 and/or 2703. Therefore, there is a possibility that the system is normal even though DTC 1501 and/or 2703 is stored. Check system links Navigation System Diagnostic Mode with the engine running, and if it appears OK, the system is OK at this time. If it is NG, do the following troubleshooting.
- Before you troubleshoot, make sure to follow the general troubleshooting information How To Troubleshoot The Navigation System.

1. Clear the hard error code.

2. Turn the ignition switch to LOCK (0), and then back to ON (II).

3. Go into the Diagnostic Menu, and select the Self-Diagnosis Mode in the Select Diagnosis Items menu Navigation System Diagnostic Mode.

4. Check the System Links.

Is the Aircon icon red?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time.�

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

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

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






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

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

Are both HEAT/VENT indicators solid with the remaining icons blinking?

YES -

Replace the navigation unit Service and Repair.�

NO -

Go to step 10.

10. Turn the ignition switch to LOCK (0), then disconnect the jumper wires.

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

12. Connect the climate control unit connector B (20P) terminals No. 2, No. 9, and No. 10 to body ground with jumper wires.






13. Check for continuity between body ground and navigation unit connector B (32P) terminals No. 4, No. 20, and No. 21 individually.





Is there continuity?

YES -

Go to step 14.

NO -

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

14. Disconnect the jumper wires.

15. Check for continuity between body ground and navigation unit connector B (32P) terminals No. 4,
No. 20, and No. 21 individually.





Is there continuity?

YES -

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

NO -

Go to step 16.

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

17. Measure the voltage between body ground and navigation unit connector B (32P) terminals No. 4,
No. 20, and No. 21 individually.





Is there 0.2 V or more?

YES -

Repair a short to power in the wire(s) between the navigation unit and the climate control unit.�

NO -

Go to step 18.

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

19. Check for continuity between the terminals of navigation unit connector B (32P) according to the table.









Is there continuity?

YES -

Repair a short in the wires between the navigation unit and the climate control unit.�

NO -

Replace the climate control unit Climate Control Unit Removal/Installation.�