Navigation Communication Line Circuit Troubleshooting

Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Operate the climate control system in several modes.
Is the climate control system OK?

YES - Go to step 3.

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 ).
Go into the System Diagnostic Mode (see SYSTEM DIAGNOSTIC MODE ), and select the Self-Diagnosis Mode to check the System Link.
Is the A/C or Mic icon red?

YES -
- If A/C icon is red, go to step 4.
- If Mic icon is red, go to "Voice control does not work/respond" in the navigation system Symptom Troubleshooting (see VOICE CONTROL DOES NOT WORK/RESPOND ).
NO - Go to step 10.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Disconnect audio-navigation unit connector D (36P).
Disconnect climate control unit connector C (20P).
Check for continuity between the following terminals of climate control unit connector C (20P) and audio-navigation unit connector D (36P).
20P: 36P:

No. 4 No. 10

No. 5 No. 11

No. 6 No. 27

Fig 1: Checking Continuity Between Terminals Of Climate Control Unit Connector C (20P) And Audio-Navigation Unit Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 8.

NO - Repair an open in the wire(s) between the climate control unit and the audio-navigation unit.
Check for continuity between body ground and climate control unit connector terminals No. 4, No. 5, and No. 6 individually.

Fig 2: Checking Continuity Between Body Ground And Climate Control Unit Connector Terminals
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 audio-navigation unit.

NO - Go to step 9.
Reconnect climate control unit connector C (20P).
Connect audio-navigation unit connector D (36P) terminals No. 10 and No. 11, then terminals No. 11 and No. 27 with jumper wires.

Fig 3: Connecting Audio-Navigation Unit Connector D (36P) Terminals No. 11 And No. 27 With Jumper Wires
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Press and hold the AUTO button, then press and hold the OFF button.

Fig 4: Pressing Auto Button
Courtesy of AMERICAN HONDA MOTOR CO., INC.

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

YES - Do the Unit Check with the navigation system (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 ).