Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSACURA2008CSX BASE, K20A3REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 17 (CLIMATE CONTROL SYSTEM)CLIMATE CONTROLAUDIO COMMUNICATION LINE CIRCUIT TROUBLESHOOTINGWITH NAVIGATION

2008 Acura CSX Base, K20A3

With Navigation

2008 Acura CSX Base, K20A3SECTION 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 )

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.