With Navigation

1. Disconnect climate control unit connector A (32P) and the audio-navigation switch panel 24P connector
2. Check for continuity between the following terminals of climate control unit connector A (32P) and the audio-navigation switch panel 24P connector

   32P 24P

   No 3 No 7

   No 4 No 19

   Fig 1: Checking Continuity Between Terminals Of Climate Control Unit Connector A (32P) And Audio-Navigation Switch Panel 24P Connector

   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity? 

   YES  -Go to step 3

   NO  -Repair open in the wire between climate control unit connector A (32P) and the audio-navigation switch panel 24P connector

3. Check for continuity between body ground and climate control unit connector A (32P) terminals No 3 and No 4 individually
   Fig 2: Checking Continuity Between Body Ground And Climate Control Unit Connector A (32P) Terminals 3 And 4

   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity? 

   YES  -Repair short to body ground in the wire between climate control unit connector A (32P) and the audio-navigation switch panel 24P connector

   NO  -Go to step 4

4. Reconnect climate control unit connector A (32P)
5. Connect the audio-navigation switch panel 24P connector terminals No 7 and No 19 with a jumper wire
   Fig 3: Connecting Audio-Navigation Switch Panel 24P Connector Terminals 7 And 19 With Jumper Wire

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
7. Press and hold the front DEF button and OFF button

Is the front DEF button LED blinking? 

YES  -The audio-navigation switch panel is faulty, replace the audio-navigation switch panel (see AUDIO-NAVIGATION SWITCH PANEL REMOVAL/INSTALLATION )

NO  -The climate control unit is faulty, replace the climate control unit (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION )