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Diagnostic Test: Mic Level

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Check the vehicle battery condition first (see BATTERY TEST ).
  • Check any official Honda service website for more service information about the navigation system.
  • Before assuming that a voice complaint is hardware related, ensure that the voice control system is being operated correctly.
    • Make sure you are sitting in the driver's seat when you give voice commands.
    • Make sure you are on the correct screen when trying to issue a voice command. For instance, the command "Find the nearest Italian Restaurant" only works on Map screen. (See the Navigation System manual for a complete list of allowed voice commands for the information being displayed).
    • Close the windows and sunroof.
    • Set the fan speed to low (1 or 2).
    • Adjust the air flow from the air conditioning vents so that they do not blow against the microphone on the ceiling.
    • Pause after pressing the TALK button then give a voice command clearly in a natural speaking voice. If the system cannot recognize your command, speak louder.
    • If you speak a command with something in your mouth, or your voice is too husky, or high pitched, the system may misunderstand your command.
  • Check the connectors for poor connections or loose terminals.
  • Check for a loose roof console microphone; if it's loose, tighten it.
  • Before troubleshooting, make sure you have anti-theft codes for the audio-navigation unit.
  • After troubleshooting, enter the anti-theft codes for the audio-navigation unit.
  • Determine if the problem only happens to one person, or everyone who uses the system.
  • If the system only has a problem with one person's voice, this should be considered a system limitation.
  • Check for and resolve all CAN DTCs before troubleshooting the navigation system.
  1. Turn the ignition switch to ON (II).
  2. Measure the voltage between body ground and HFL-navigation microphone 7P connector terminals No. 6 and No. 7 individually.
    Fig 1: Measuring Voltage Between Body Ground And 7P Connector Terminals
    G08058210Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 3.

    NO  -If the +B wire does not have voltage, repair an open in the wire between the under-dash fuse/relay box and the HFL-navigation microphone 7P connector. If the ACC wire does not have voltage, repair an open in the wire between the under-dash fuse/relay box and the HFL-navigation microphone 7P connector.

  3. Measure the voltage between HFL-navigation microphone 7P connector terminal No. 1 and body ground.
    Fig 2: Measuring Voltage Between 7P Connector Terminal No. 1 And Body Ground
    G08058211Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there less than 0.2 V? 

    YES  -Go to step 4.

    NO  -Repair an open or high resistance in the wire between HFL-navigation microphone 7P connector terminal No. 1 and body ground (G601) (see CONNECTOR TO FUSE/RELAY BOX INDEX ).

  4. Go into the Self-Diagnosis Mode, select Mic Icon Menu, and use the Mic Level test under Functional Setup (see FUNCTIONAL SETUP  ) to check the operation of the TALK and BACK buttons.

    Are the TALK and BA CK buttons operational? 

    YES  -Go to step 5.

    NO  -Do the HFL system troubleshooting.

  5. Use the Mic Level diagnostic under Functional Setup (see FUNCTIONAL SETUP  ) to check the operation of the microphone.

    Is the microphone operational? 

    YES  -Check the operation of the voice control system (see the Navigation System Manual).

    NO  -Go to step 6.

  6. Turn the ignition switch to LOCK (0).
  7. Disconnect the HandsFreeLink control unit 28P connector (see step 2 under HANDSFREELINK CONTROL UNIT REMOVAL/INSTALLATION
  8. Disconnect audio-navigation unit connector C (28P).
  9. Check for continuity between body ground and audio-navigation unit connector C (28P) terminal No. 27 and No. 28 individually.
    Fig 3: Checking Continuity Between Body Ground And Connector C (28P) Terminal
    G08058212Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -There is a short to body ground in the wire(s) between the HandsFreeLink control unit and the audio-navigation unit. Replace the affected shielded harness.

    NO  -Go to step 10.

  10. Check for continuity between audio-navigation unit connector C (28P) terminals No. 27 and No. 28.
    Fig 4: Checking Continuity Between Connector C (28P) Terminals
    G08058213Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -There is a short in the wires between the HandsFreeLink control unit and the audio-navigation unit. Replace the affected shielded harness.

    NO  -Go to step 11.

  11. Check for continuity between the terminals of audio-navigation unit connector C (28P) according to the table.
From terminal To terminals
C14 (BRN) C27 (LT BLU), C28 (PUR)
Fig 5: Identifying Audio-Navigation Unit Connecter C (28P)
G08058214Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity between any of the terminals? 

YES  -There is a short in the wires between the HandsFreeLink control unit and the audio-navigation unit. Replace the affected shielded harness.

NO  -Substitute a known-good components in this order until the problem goes away:

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