Interface dial buttons do not work

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 the connectors for poor connections or loose terminals.
Check for and resolve all CAN DTCs before troubleshooting the navigation system.
Check any official Honda service website for more service information about the navigation system.
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.

Start the vehicle.
Go into the Detail Information & Settings 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.
Measure the voltage between interface dial 5P connector terminal No. 4 and body ground.

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

Is there battery voltage?

YES -Go to step 4.

NO -Repair an open in the wire between the 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 5P Connector Terminal No. 3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2 V?

YES -Go to step 5.

NO -Repair an open or high resistance in the wire between interface dial 5P connector terminal No. 3 and body ground (G506) (see CONNECTOR TO FUSE/RELAY BOX INDEX ).
Turn the ignition switch to LOCK (0).
Disconnect audio-navigation unit connector C (28P).
Disconnect the interface dial 5P connector.
Check for continuity between audio-navigation unit connector C (28P) terminal No. 26 and interface dial 5P connector terminal No. 1.

Fig 3: Checking Continuity Between Unit Connector C (28P) And 5P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 9.

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 C (28P) terminals No. 13 and No. 26.

Fig 4: Checking Continuity Between Connector C (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 10.
Substitute a known-good interface dial (see INTERFACE DIAL REMOVAL/INSTALLATION ), and recheck.
Is the system OK?

YES -Replace the original interface dial (see INTERFACE DIAL REMOVAL/INSTALLATION ).

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