Interface Dial Buttons Do Not Work

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NOTE:

Check The Vehicle Battery Condition First (See Battery Test ).
Check The Connectors At The Interface Dial And The Audio-Navigation Switch Panel For Poor Connections Or Loose Terminals.
Make Sure That The Correct Navigation DVD Color And Version Are Installed. The Wrong Navigation DVD Or Software Version Can Cause A Hardware Malfunction.
Inspect The Navigation DVD For Dirt Or Damage (See DVD Handling And Cleaning ).
Check Any Official Honda Service Website For More Service Information About The Navigation System.
Before Troubleshooting, Make Sure You Have The Anti-Theft Codes For The Audio System And The Navigation System.
After Troubleshooting, Enter The Anti-Theft Codes For The Audio System And The Navigation System.

Turn the ignition switch to ON (II).
Go Into The System Diagnostic Mode, And 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 v
Turn The Ignition Switch To Lock (0).
Remove The Audio-Navigation Switch Panel (See Audio-Navigation Switch Panel Removal/Installation ).
Turn The Ignition Switch To On (II).
Measure The Voltage Between The Interface Dial 5P Connector Terminal No. 2 And Body Ground.

Fig 1: Measuring Voltage Between Interface Dial 5P Connector Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is There Battery Voltage?

Yes -Go to next step.

No -Repair An 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 0.2 V?

Yes --Go to next step.

No -Repair An Open Or High Resistance In The Wire Between The Interface Dial And Body Ground (G502); With Navigation System (See Audio Wire Harness (With Navigation System) (Aa) ), Without Navigation System (See Audio Wire Harness (Without Navigation System) (Aa) ).
Turn The Ignition Switch To Lock (0).
Disconnect The Interface Dial 5P Connector And Navigation Unit Connector B (32P).
Check For Continuity Between Body Ground And Navigation Unit Connector B (32P) Terminal No. 26.

Fig 3: Checking Continuity Between Body Ground And Navigation Unit Connector B (32P) Terminal No. 26
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is There Continuity?

Yes -There Is A Short To Body Ground In The Wire Between The Navigation Unit And The Interface Dial, Replace The Affected Shielded Harness.

No -Go to next step.
Check For Continuity Between Navigation Unit Connector B (32P) Terminals No. 24 And No. 26.

Fig 4: Checking Continuity Between Navigation Unit Connector B (32P) Terminals No. 24 And No. 26
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is There Continuity?

Yes -There Is A Short In The Wires Between The Navigation Unit And The Interface Dial. Replace The Affected Shielded Harness.

No -Go to next step.
Check For Continuity Between Navigation Unit Connector B (32P) Terminal No. 26 And Interface Dial 5P Connector Terminal No. 5.

Fig 5: Checking Continuity Between Navigation Unit Connector B (32P) Terminal 26 And Interface Dial 5P
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is There Continuity?

Yes -Go to next step.

No -There Is An Open In The Wire Between The Interface Dial And The Navigation Unit. Replace The Affected Shielded Harness.
Substitute A Known-Good Interface Dial (See navigation Display Unit Removal/Installation ), And Recheck.
Is The System OK?

Yes -Replace The Original Interface Dial (See navigation Display Unit Removal/Installation ).

No -Replace The Navigation Unit (See navigation Unit Removal/Installation ).