Navigation frequently asks for anti-theft code and/or needs GPS initialization

NOTE:

This is often caused by a loss of battery power, a low or poor battery condition, or a poor ground.
Make sure that the latest navigation software is installed.
Check any official Honda service website for more service information about the navigation system.

Turn the ignition switch to LOCK (0).
Disconnect audio-navigation unit connector A (24P), and check for loose terminals.
NOTE: Eject all the discs before disconnecting the audio-navigation unit to prevent damaging the CD/DVD player's load mechanism.

Are there connections or terminals loose?

YES -Repair or replace the loose terminal(s).

NO -Go to step 3.
Reconnect audio-navigation unit connector A (24P).
Turn the ignition switch to ON (II).
Measure the voltage between body ground and audio-navigation unit connector A (24P) terminals No. 3 and No. 24 individually.

Fig 1: Measuring Voltage Between Body Ground And Audio-Navigation Unit Connector A (24P) Terminals No. 3 And No. 24
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 6.

NO -If the +B wire does not have voltage, repair an open in the wire between the under-hood fuse/relay box and audio-navigation unit connector A (24P) terminal No. 3. If the ACC wire does not have voltage, repair an open in the wire between the driver's under-dash fuse/relay box and audio-navigation unit connector A (24P) terminal No. 24.
Measure the voltage between audio-navigation unit connector A (24P) terminal No. 1 and body ground.

Fig 2: Measuring Voltage Between Audio-Navigation Unit Connector A (24P) Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2 V?

YES -Replace the audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).

NO -Repair an open or high resistance in the wire between audio-navigation unit connector A (24P) terminal No. 1 and body ground (G502) (see AUDIO WIRE HARNESS (WITH NAVIGATION) (I) ).