Diagnostic Test Mic Level

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.

NOTE:

Check the vehicle battery condition first (see BATTERY TEST )
Make sure that the latest navigation software is installed
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 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 navigation 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 code
After troubleshooting, enter the anti-theft code
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

Connect the HDS to the DLC
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
Check for DTCs with the HDS
Are there any DTCs present?

YES -Troubleshoot the DTC, then retest

NO -Go to step 4
Measure the voltage between body ground and HFL-navigation microphone connector terminals No 6 and No 7 individually

Fig 1: Measuring Voltage Between HFL-Navigation Microphone Connector Terminals No 6 And No 7 Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 5

NO -If the +B wire does not have voltage, repair open in the wire between the under-hood fuse/relay box and the HFL-navigation microphone 7P connector If the ACC wire does not have voltage, repair open in the wire between the driver's under-dash fuse/relay box and the HFL-navigation microphone 7P connector
Measure the voltage between HFL-navigation microphone 7P connector terminal No 1 and body ground

Fig 2: Measuring Voltage Between HFL-Navigation Microphone 7P Connector Terminal No 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2V?

YES -Go to step 6

NO -Repair open or high resistance in the wire between the HFL-navigation microphone and body ground (G401) (see DASHBOARD WIRE HARNESS (VIEW OF DRIVER'S SIDE) )
Go into the System Diagnostic Mode and use the Mic Level test under Functional Setup (see Mic Level ) to check the operation of the TALK and BACK buttons
Are the TALK and BACK buttons operational?

YES -Go to step 7

NO -Troubleshoot the HFL system
Use the Mic Level diagnostic under Functional Setup (see Mic Level ) 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 8
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
Remove the center console panel (see CENTER CONSOLE PANEL REMOVAL/INSTALLATION )
Disconnect the HandsFreeLink control unit 28P connector (see step 2 on HFL SWITCH TEST )
Disconnect the audio-navigation unit connector H (28P)
Check for continuity between body ground and audio-navigation unit connector H (28P) terminal No 27 and No 28 individually

Fig 3: Checking Continuity Between Audio-Navigation Unit Connector H (28P) Terminal No 27 And No 28 Body Ground
Courtesy 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 13
Check for continuity between audio-navigation unit connector H (28P) terminals No 27 and No 28

Fig 4: Checking Continuity Between Audio-Navigation Unit Connector H (28P) Terminals No 27 And No 28
Courtesy 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 14

Check for continuity between the terminals of audio-navigation unit connector H (28P) according to the table

CONTINUITY REFERENCE CHART

From terminal	To terminals
H14 (GRY)	H27 (RED), H28 (GRN)

Fig 5: Identifying Audio-Navigation Unit Connector H (28P)

Courtesy 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 known-good components in this order until the problem goes away

HFL-navigation microphone
HandsFreeLink control unit
Audio-navigation unit