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Home >> Acura >> 2014 >> TSX Special Edition, Automatic Trans >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control (4-CYL) >> Audio Communication Line Circuit Troubleshooting >> Without Navigation

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  1. Disconnect the audio-HVAC display unit 12P connector.
  2. Turn the ignition switch to ON (II).
  3. Measure the voltage between audio-HVAC display unit 12P connector terminal No. 6 and body ground.
    Fig 1: Measuring The Voltage Between Audio-HVAC Display Unit 12P Connector Terminal No. 6 And Body Ground
    G00520182Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 4.

    NO  -Repair an open in the wire between the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box and the audio-HVAC display unit.

  4. Turn the ignition switch to LOCK (0).
  5. Disconnect climate control unit connector A (28P).
  6. Check for continuity between the following terminals of climate control unit connector A (28P) and the audio-HVAC display unit 12P connector.

    28P: 12P:

    No. 19 No. 7

    No. 20 No. 8

    Fig 2: Checking Continuity Between Terminals Of Climate Control Unit Connector A (28P) And Audio-HVAC Display Unit 12P Connector
    G07770681Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 7.

    NO  -Repair an open in the wire between climate control unit connector A (28P) and the audio-HVAC display unit 12P connector.

  7. Check for continuity between body ground and climate control unit connector A (28P) terminals No. 19 and No. 20 individually.
    Fig 3: Checking Continuity Between Body Ground And Climate Control Unit Connector A (28P) Terminals No. 19 And No. 20
    G07770682Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short to body ground in the wire between climate control unit connector A (28P) and the audio-HVAC display unit 12P connector.

    NO  -Go to step 8.

  8. Reconnect climate control unit connector A (28P).
  9. Connect audio-HVAC display unit 12P connector terminals No. 7 and No. 8 with a jumper wire.
    Fig 4: Connecting Audio-HVAC Display Unit 12P Connector Terminals No. 7 And No. 8 Using Jumper Wire
    G07770683Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Turn the ignition switch to ON (II).
  11. Press and hold the WINDSHIELD DEFOGGER button and ON/OFF button.

    Is the WINDSHIELD DEFOGGER button LED blinking? 

    YES  -The audio-HVAC display unit is faulty, replace the audio-HVAC display unit (see AUDIO-HVAC DISPLAY UNIT REMOVAL/INSTALLATION ).

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

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