Interface Dial Buttons Do Not Work

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 )
Check the connectors for poor connections or loose terminals
Check any official Honda service website for more service information about the navigation system
Before troubleshooting, make sure you have anti-theft code
After troubleshooting, enter the anti-theft code

Start the vehicle
Go into the System Diagnostic Mode select Unit Check, and use Hard Key test under Unit Check (see UNIT CHECK (QUICK CHECK) )
Do the interface dial buttons work properly?

YES -The system is OK at this time

NO -Go to step 3
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
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 7
Measure the voltage between the interface dial 5P connector terminal No 4 and body ground

Fig 1: Measuring Voltage Between Interface Dial 5P Connector Terminal No 4 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 8

NO -Repair open in the wire between the driver's under-dash fuse/relay box and the interface dial
Measure the voltage between interface dial 5P connector terminal No 3 and body ground

Fig 2: Measuring Voltage Between Interface Dial 5P Connector Terminal No 3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2V?

YES -Go to step 9

NO -Repair open or high resistance in the wire between the interface dial and body ground (G501) (see AUDIO WIRE HARNESS )
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
Disconnect audio-navigation unit connector H (28P)
Disconnect the interface dial 5P connector
Check for continuity between audio-navigation unit connector H (28P) terminal No 26 and interface dial 5P connector terminal No 1

Fig 3: Checking Continuity Between Audio-Navigation Unit Connector H (28P) And Interface Dial 5P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 13

NO -There is an open in the wire between the interface dial and the audio-navigation unit Replace the affected shielded harness
Check for continuity between audio-navigation unit connector H (28P) terminals No 13 and No 26

Fig 4: Checking Continuity Between Audio-Navigation Unit Connector H (28P) Terminals No 13 And No 26
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -There is a short in the wires between the audio-navigation unit and the interface dial Replace the affected shielded harness

NO -Go to step 14
Substitute a known-good interface dial (see HFL-NAVIGATION MICROPHONE REMOVAL/INSTALLATION ), and recheck
Is the system OK?

YES -Replace the original interface dial (see HFL-NAVIGATION MICROPHONE REMOVAL/INSTALLATION )

NO -Replace the audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION )