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Home >> Acura >> 2012 >> ZDX >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control >> HVAC Switch Communication Line Circuit Troubleshooting >> Without Navigation

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  1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  2. Disconnect audio and HVAC switch panel connector A (20P).
  3. Check for continuity between audio and HVAC switch panel connector A (20P) terminal No. 3 and body ground.
    Fig 1: Checking For Continuity Between Audio And HVAC Switch Panel Connector A (20P) Terminal No. 3 And Body Ground
    G08076326Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 4.

    NO  -Check for an open in the wire between the audio and HVAC switch panel and body ground. If the wire is OK, check for poor body ground at G501 (see CONNECTOR TO FUSE/RELAY BOX INDEX ).

  4. If the following switches do not work, go to the step indicated below respectively.
    • DRIVER'S SIDE MODE CONTROL button, go to step 5.
    • DRIVER'S SIDE TEMPERATURE CONTROL switch, go to step 5.
    • DRIVER'S SIDE AUTO button, go to step 5.
    • PASSENGER'S SIDE MODE CONTROL button, go to step  16.
    • PASSENGER'S SIDE TEMPERATURE CONTROL switch, go to step  16.
    • PASSENGER'S SIDE AUTO button, go to step  16.
    • ON/OFF button, go to step  27.
    • FAN CONTROL button, go to step  27.
    • SYNC button, go to step  27.
    • WINDSHIELD DEFROST button, go to step  38.
    • RECIRCULATION button, go to step  38.
    • AIR CONDITIONING button, go to step  38.
    • REAR WINDOW DEFOGGER/MIRROR DEFOGGER button, go to step  38.
  5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  6. Measure the voltage between body ground and climate control unit connector B (24P) terminals No. 17, No. 18, No. 19, and No. 20 individually.
    Fig 2: Measuring Voltage Between Body Ground And Climate Control Unit Connector B (24P) Terminals
    G08076327Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Go to step 7.

    NO  -Go to step  11.

  7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  8. Disconnect audio and HVAC switch panel connector B (32P).
  9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  10. Measure the voltage between body ground and audio and HVAC switch panel connector B (32P) terminals No. 10, No. 24, No. 25, and No. 26 individually.
    Fig 3: Measuring Voltage Between Body Ground And Audio And Hvac Switch Panel Connector B (32P) Terminals
    G08076328Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Substitute a known-good audio and HVAC switch panel, and recheck. If the symptom goes away, replace the original audio and HVAC switch panel (see AUDIO AND HVAC SWITCH PANEL REMOVAL/INSTALLATION ).

    NO  -Repair an open in the wires between the climate control unit and the audio and HVAC switch panel.

  11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  12. Disconnect climate control unit connector B (24P) and audio and HVAC switch panel connector B (32P).
  13. Check for continuity between body ground and climate control unit connector B (24P) terminals No. 17, No. 18, No. 19 and No. 20 individually.
    Fig 4: Checking For Continuity Between Body Ground And Climate Control Unit Connector B (24P) Terminals
    G08076329Courtesy 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 and HVAC switch panel.

    NO  -Go to step 14.

  14. Reconnect audio and HVAC switch panel connector B (32P).
  15. Check for continuity between body ground and audio and HVAC switch panel connector B (32P) terminals No. 10, No. 24, No. 25, and No. 26 individually. Do not press the switch or the button.
    Fig 5: Checking For Continuity Between Body Ground And Audio And HVAC Switch Panel Connector B (32P) Terminals
    G08076330Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Substitute a known-good audio and HVAC switch panel, and recheck. If the symptom goes away, replace the original audio and HVAC switch panel (see AUDIO AND HVAC SWITCH PANEL REMOVAL/INSTALLATION ).

    NO  -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION  ).

  16. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  17. Measure the voltage between body ground and climate control unit connector B (24P) terminals No. 5, No. 6, No. 7 and No. 8 individually.
    Fig 6: Measuring Voltage Between Body Ground And Climate Control Unit Connector B (24P) Terminals
    G08076331Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Go to step 18.

    NO  -Go to step  22.

  18. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  19. Disconnect audio and HVAC switch panel connector B (32P).
  20. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  21. Measure the voltage between body ground and audio and HVAC switch panel connector B (32P) terminals No. 13, No. 14, No. 29 and No. 30 individually.
    Fig 7: Measuring Voltage Between Body Ground And Audio And HVAC Switch Panel Connector B (32P) Terminals
    G08076332Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Substitute a known-good audio and HVAC switch panel, and recheck. If the symptom goes away, replace the original audio and HVAC switch panel (see AUDIO AND HVAC SWITCH PANEL REMOVAL/INSTALLATION ).

    NO  -Repair an open in the wires between the climate control unit and the audio and HVAC switch panel.

  22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  23. Disconnect climate control unit connector B (24P) and audio and HVAC switch panel connector B (32P).
  24. Check for continuity between body ground and climate control unit connector B (24P) terminals No. 5, No. 6, No. 7, and No. 8 individually.
    Fig 8: Checking For Continuity Between Body Ground And Climate Control Unit Connector B (24P) Terminals
    G08076333Courtesy 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 and HVAC switch panel.

    NO  -Go to step 25.

  25. Reconnect audio and HVAC switch panel connector B (32P).
  26. Check for continuity between body ground and audio and HVAC switch panel connector B (32P) terminals No. 13, No. 14, No. 29, and No. 30 individually. Do not press the switch or the button.
    Fig 9: Checking For Continuity Between Body Ground And Audio And HVAC Switch Panel Connector B (32P) Terminals
    G08076334Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Substitute a known-good audio and HVAC switch panel, and recheck. If the symptom goes away, replace the original audio and HVAC switch panel (see AUDIO AND HVAC SWITCH PANEL REMOVAL/INSTALLATION ).

    NO  -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION  ).

  27. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  28. Measure the voltage between body ground and climate control unit connector B (24P) terminals No. 21, No. 22, No. 23, and No. 24 individually.
    Fig 10: Measuring Voltage Between Body Ground And Climate Control Unit Connector B (24P) Terminals
    G08076335Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Go to step 29.

    NO  -Go to step  33.

  29. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  30. Disconnect audio and HVAC switch panel connector B (32P).
  31. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  32. Measure the voltage between body ground and audio and HVAC switch panel connector B (32P) terminals No. 11, No. 12, No. 27, and No. 28 individually.
    Fig 11: Measuring Voltage Between Body Ground And Audio And HVAC Switch Panel Connector B (32P) Terminals
    G08076336Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Substitute a known-good audio and HVAC switch panel, and recheck. If the symptom goes away, replace the original audio and HVAC switch panel (see AUDIO AND HVAC SWITCH PANEL REMOVAL/INSTALLATION ).

    NO  -Repair an open in the wires between the climate control unit and the audio and HVAC switch panel.

  33. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  34. Disconnect climate control unit connector B (24P) and audio and HVAC switch panel connector B (32P).
  35. Check for continuity between body ground and climate control unit connector B (24P) terminals No. 21, No. 22, No. 23, and No. 24 individually.
    Fig 12: Checking For Continuity Between Body Ground And Climate Control Unit Connector B (24P) Terminals
    G08076337Courtesy 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 and HVAC switch panel.

    NO  -Go to step 36.

  36. Reconnect audio and HVAC switch panel connector B (32P).
  37. Check for continuity between body ground and audio and HVAC switch panel connector B (32P) terminals No. 11, No. 12, No. 27, and No. 28 individually. Do not press the switch or the button.
    Fig 13: Checking For Continuity Between Body Ground And Audio And Hvac Switch Panel Connector B (32P) Terminals
    G08076338Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Substitute a known-good audio and HVAC switch panel, and recheck. If the symptom goes away, replace the original audio and HVAC switch panel (see AUDIO AND HVAC SWITCH PANEL REMOVAL/INSTALLATION ).

    NO  -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION  ).

  38. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  39. Measure the voltage between body ground and climate control unit connector B (24P) terminals No. 9, No. 10, No. 11, and No. 12 individually.
    Fig 14: Measuring Voltage Between Body Ground And Climate Control Unit Connector B (24P) Terminals
    G08076339Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Go to step 40.

    NO  -Go to step  44.

  40. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  41. Disconnect audio and HVAC switch panel connector B (32P).
  42. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  43. Measure the voltage between body ground and audio and HVAC switch panel connector B (32P) terminals No. 15, No. 16, No. 31, and No. 32 individually.
    Fig 15: Measuring Voltage Between Body Ground And Audio And HVAC Switch Panel Connector B (32P) Terminals
    G08076340Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Substitute a known-good audio and HVAC switch panel, and recheck. If the symptom goes away, replace the original audio and HVAC switch panel (see AUDIO AND HVAC SWITCH PANEL REMOVAL/INSTALLATION ).

    NO  -Repair an open in the wires between the climate control unit and the audio and HVAC switch panel.

  44. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  45. Disconnect climate control unit connector B (24P) and audio and HVAC switch panel connector B (32P).
  46. Check for continuity between body ground and climate control unit connector B (24P) terminals No. 9, No. 10, No. 11, and No. 12 individually.
    Fig 16: Checking For Continuity Between Body Ground And Climate Control Unit Connector B (24P) Terminals
    G08076341Courtesy 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 and HVAC switch panel.

    NO  -Go to step 47.

  47. Reconnect audio and HVAC switch panel connector B (32P).
  48. Check for continuity between body ground and audio and HVAC switch panel connector B (32P) terminals No. 15, No. 16, No. 31, and No. 32 individually. Do not press the switch or the button.
    Fig 17: Checking For Continuity Between Body Ground And Audio And HVAC Switch Panel Connector B (32P) Terminals
    G08076342Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Substitute a known-good audio and HVAC switch panel, and recheck. If the symptom goes away, replace the original audio and HVAC switch panel (see AUDIO AND HVAC SWITCH PANEL REMOVAL/INSTALLATION ).

    NO  -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION  ).

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