Honda Accord: Navigation Communication Line Circuit Troubleshooting - Climate Control - Heating, Ventilation, and Air Conditioning - Honda Accord MK8 2008-2012 Service ManualHonda 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)


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


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


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


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 ).

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