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Home › Acura › 2012 › ZDX › Repair and Diagnosis › Heating, Ventilation & A/C (HVAC) › HVAC Control Systems › Climate Control › Navigation Communication Line Circuit Troubleshooting

Navigation Communication Line Circuit Troubleshooting

  1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  2. Operate the climate control system in several modes.

    Is the climate control system OK? 

    YES  -Go to step 3.

    NO  -Do the Self-Diagnostic Function with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS  ) or the climate control unit (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS  ).

  3. Go into the System Diagnostic Mode (see SYSTEM LINKS ), and select the Self-Diagnosis Mode to check the System Link.

    Is the A/C or Mic icon red? 

    YES  -

    • If A/C icon is red, go to step 4.
    • If Mic icon is red, go to "Voice control does not work/respond" in the navigation system Symptom Troubleshooting (see SYMPTOM TROUBLESHOOTING INDEX ).

    NO  -Go to step  9.

  4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  5. Disconnect audio-navigation unit connector D (20P).
  6. Disconnect climate control unit connector C (20P).
  7. Check for continuity between the following terminals of climate control unit connector C (20P) and audio-navigation unit connector D (20P).

    20P 20P:

    No. 4 No. 4

    No. 5 No. 5

    No. 6 No. 14

    Fig 1: Checking For Continuity Between Following Terminals Of Climate Control Unit Connector C (20P) And Audio-Navigation Unit Connector D (20P)
    G08076343Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 8.

    NO  -Repair an open in the wire(s) between the climate control unit and the audio-navigation unit.

  8. Check for continuity between body ground and climate control unit connector terminals No. 4, No. 5, and No. 6 individually.
    Fig 2: Checking For Continuity Between Body Ground And Climate Control Unit Connector Terminals
    G08076344Courtesy 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-navigation unit.

    NO  -Reconnect climate control unit connector C (20P), then go to step  10.

  9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  10. Connect audio-navigation unit connector D (20P) terminals No. 4 and No. 5 with jumper wire, then connect terminals No. 4 and No. 14 with a jumper wire.
    Fig 3: Connecting Audio-Navigation Unit Connector D (20P) Terminals
    G08076345Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  12. Press and hold the AUTO button, then press and hold the ON/OFF button.
    Fig 4: Identifying HEAT/VENT Indicator
    G08076346Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is the HEAT/VENT indicator solid with the remaining icons blinking? 

    YES  -Substitute a known-good audio-navigation unit (including the HDD), and recheck. If the symptom goes away, replace the original audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).

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

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