With Navigation

WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect climate control unit connector A (32P) and the audio-navigation switch panel 24P connector
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
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
Reconnect climate control unit connector A (32P)
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.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
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 )