Navigation Communication Line Circuit Troubleshooting

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.

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 LINKS ).
Is the A/C icon red?

YES -Go to step 3.

NO -Disconnect audio-navigation unit connector D (12P), then go to step 9.
Turn the ignition switch to LOCK (0).
Disconnect audio-navigation unit connector D (12P).
Disconnect climate control unit 36P connector.
Check for continuity between the following terminals of climate control unit 36P connector and audio-navigation unit connector D (12P).
36P: 12P:

No. 31 No. 5

No. 32 No. 12

No. 33 No. 6

Fig 1: Checking Continuity Between Climate Control Unit 36P Connector And Audio-Navigation Unit Connector D (12P)
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 audio-navigation unit.
Check for continuity between body ground and climate control unit 36P connector terminals No. 31, No. 32, and No. 33 individually.

Fig 2: Checking Continuity Between Body Ground And Climate Control Unit 36P 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 8.
Reconnect climate control unit 36P connector.
Connect audio-navigation unit connector D (12P) terminals No. 5, No. 6, and No. 12 with jumper wires.

Fig 3: Connecting Audio-Navigation Unit Connector D (12P) Terminals With Jumper Wires
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to ON (II).
Press and hold the AUTO button, then press and hold the OFF button.

Fig 4: Identifying 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 audio-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.