Navigation Communication Line Circuit Troubleshooting

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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 HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS ) or the climate control unit (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS ).
Do the System Links in navigation System Diagnostic Mode (see SYSTEM DIAGNOSTIC MODE ).
Is the A/C icon red?

YES -Go to step 3.

NO -Go to step 9.
Turn the ignition switch to LOCK (0).
Disconnect navigation unit connector B (32P).
Disconnect climate control unit connector B (12P).
Check for continuity between the following terminals of climate control unit connector B (12P) and navigation unit connector B (32P).
12P: 32P:

No. 10 No. 28

No. 11 No. 13

No. 12 No. 29

Fig 1: Checking For Continuity Between Following Terminals Of Climate Control Unit Connector B (12P) And Navigation Unit Connector B (32P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 7.

NO -Repair an open in the wire(s) between the climate control unit and the navigation unit.
Check for continuity between body ground and climate control unit connector B (12P) terminals No. 10, No. 11, and No. 12 individually.

Fig 2: Checking For Continuity Between Body Ground And Climate Control Unit Connector B (12P) Terminals No. 10, No. 11, And No. 12 Individually
Courtesy of AMERICAN HONDA MOTOR CO., INC.

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.
Reconnect climate control unit connector B (12P).
Connect navigation unit connector B (32P) terminals No. 13, and No. 29 with a jumper wire.

Fig 3: Connecting Navigation Unit Connector B (32P) Terminals No. 13, And No. 29 With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Press and hold both the AUTO button and the ON/OFF button, then turn the ignition switch to ON (II).
Check the mode indicator displaying in the audio-HVAC subdisplay unit.

Fig 4: Checking Mode Indicator Displaying In Audio-HVAC Subdisplay Unit
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the HEAT/VENT indicator solid with the remaining icons blinking?

YES -Do the Unit Check in the navigation System Diagnostic Mode (see UNIT CHECK (QUICK CHECK) ).

NO -Substitute a known-good climate control unit, and recheck. If the symptom goes away, replace the original climate control unit (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION ).