Honda Accord: 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 (see page 21-102) or climate control unit (see page 21-103).

2. Do the Navi system links (see page 23-176).

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

- • 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 (see page 23-226).

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 (12P).

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

12P:       32P:

No. 7    No. 20

No. 8    No. 4

No. 9    No. 21

CLIMATE CONTROL UNIT CONNECTOR B (12P)

Wire side of female terminals

NAVIGATION UNIT CONNECTOR B (32P)

Wire side of female terminals

Is there continuity? YES

-Go to step 7.

NO

-Repair an open in the wire(s) between the climate control unit and the navigation u n i t.

7. Check for continuity between body ground and climate control unit connector B (12P) terminals No. 7, 8, and No. 9 individually.

CLIMATE CONTROL UNIT CONNECTOR B (12P)

Wire side of female terminals

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 (12P).

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

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

NAVIGATION UNIT CONNECTOR B (32P)

Wire side of female terminals

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 (see page 23-182).

NO

-Substitute a known-good climate control unit, and recheck. If the symptom goes away, replace the original climate control unit (see page 2 1 - 1 9 0 ).