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

Measure the voltage between navigation unit connector A (17P) terminal No. 14 and body ground, and between terminal No. 17 and body ground.

Fig 1: Measuring Voltage Between Navigation Unit Connector A (17P) Terminal 14 And 17 Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery on both terminals?

YES | Go to step 2.

NO -Repair open in the wire between the under-dash fuse/relay box and the navigation unit.
Measure the voltage between navigation unit connector A (17P) terminal No. 9 and body ground, and between navigation unit connector C (12P) terminal No. 4 and body ground.

Fig 2: Measuring Voltage Between Navigation Unit Connector A (17P) Terminal 9 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 3: Measuring Voltage Between Navigation Unit Connector C (12P) Terminal 4 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less that 0.1 V?

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

NO -Repair open in the wire between the navigation unit and body ground (G501).