Navigation system will not accept security code

NOTE:

Check the vehicle battery condition first.
Check the connectors for poor connections or loose terminals.
The system will not operate without the 4-digit security (anti-theft) code. Follow the this procedure. (After 10 consecutive tries, you must cycle the key to continue trying)
The Navigation System Diagnosis and Core Return Form is available on ISIS, under Job aids, and can be printed out for recording this information. This information will help the remain facility determine what caused the failure.
Always check for and resolve all CAN DTCs before troubleshooting the navigation system.
Verify that the correct navigation unit is installed for this model. Go into the Diagnostic mode, and use Version.
Before troubleshooting, make sure you have anti-theft codes for the audio system and the navigation system.
Make sure that the correct DVD color and version are installed.
Inspect the DVD for dirt or damage.
Check any official Honda service website for more service information about the navigation system.

Go into the "System diagnosis menu" (see SYSTEM DIAGNOSTIC MODE ), select "Unit check," and then "Navi ECU." A brief diagnostic will run for 20 seconds, and the serial number is then displayed.
Is the serial number displayed?

YES - Go to step 4.

NO - Go to step 2.
Remove the navigation unit (see NAVIGATION UNIT REMOVAL/INSTALLATION ).
Check the serial number on the label on the underside of the navigation unit.
Is the serial number confirmed ?

YES - Go to step 4.

NO - Replace the navigation unit (see NAVIGATION UNIT REMOVAL/INSTALLATION ).
Using the serial number, look up the navigation security code in the Interactive Network. (click: Service, Vehicle Information, Anti-Theft code Inquiry, and then select Navigation from the product dropdown box). Enter the serial number.
Is a 4-digit code displayed on the screen?

YES - Go to step 5.

NO - Call the Warranty Department, the telephone number is listed in the PDI/TQI bulletin, to obtain the code. Then go to step 5.
Check that the obtained code works to bypass the code screen in the navigation system.
Does the code work?

YES - The system is OK at this time. Return the vehicle to the client and give them the anti-theft code.

NO - Go to step 6.
Try entering four zeros (0000) in place for the code.
Do the four zeros work to bypass the code screen?

YES - Replace the control unit, and enter Security code is 0000 in the problem description field of the core return form

NO - Replace the control unit, and enter "Won't take security code", in the problem description field of the core return form; (as proof, enclose the sticker that contains the Serial number and the Code).