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

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

2. Disconnect climate control unit connector A (28P) and the audio-HVAC subdisplay (with navigation) or audio-HVAC display unit (without navigation) 12P connector.

3. Check for continuity between the following terminals of climate control unit connector A (28P) and the audio-HVAC subdisplay or display unit 12P connector.

28P:         12P:

No. 19     No. 7

No. 20     No. 8

CLIMATE CONTROL UNIT CONNECTOR A (28P)

Wire side of female terminals

AUDIO-HVAC SUBDISPLAY UNIT 12P CONNECTOR*!


AUDIO-HVAC SUBDISPLAY UNIT 12P CONNECTOR*!

AUDIO-HVAC DISPLAY UNIT 12P CONNECTOR*2

Wire side of female terminals

*1: With navigation

*2: Without navigation

Is there continuity? YES

-Go to step 4.

NO-

Repair an open in the wire between climate control unit connector A (28P) and the audio-HVAC subdisplay or display unit 12P connector.

4, Check for continuity between body ground and climate control unit connector A (28P) terminals No. 19 and No. 20 individually.

CLIMATE CONTROL UNIT CONNECTOR A (28P)

Wire side of female terminals


Wire side of female terminals

*1: With navigation

*2: Without navigation

Is there continuity? YES-Repair a short to body ground in the wire

between climate control unit connector A (28P) and the audio-HVAC control unit 12P connector.

NO

-Go to step 5.

5. Reconnect climate control unit connector A (28P).

6. Connect audio-HVAC subdisplay or display unit 12P connector terminals No. 7 and No. 8 with a jumper wire.

AUDIO-HVAC SUBDISPLAY UNIT 12P CONNECTOR* 1

AUDIO-HVAC DISPLAY UNIT 12P CONNECTOR*2

Wire side of female terminals


Wire side of female terminals

* 1 : With navigation

*2: Without navigation

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

8. Press and hold the DEF button and OFF button.

Is the DEF button LED blinking? YES

-Audio-HVAC subdisplay unit or display unit is faulty, replace the audio-HVAC subdisplay unit (see page 23-118) or audio-HVAC display unit (see page 23-119).

NO

-Climate control unit is faulty, replace the climate control unit (with navigation) (see page 21-190), (without navigation) (see page 21-191).

    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 ...

    Climate Control Switch Communication Line Circuit Troubleshooting
    1. Operate the climate control system with the passenger's climate control switch in all modes. Does the climate control system operate? YES-lntermittent failure. Check for loose wires or poor c ...

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