NAVI control unit detects that inserted DVD-ROM map is malfunctioning or if it is impossible to load data from DVD-ROM map

1. Remove inserted DVD-ROM map to check that it is identified.

OK or NG 

OK: GO TO 2.

NG: Replace identified DVD-ROM map.

1. Check DVD-ROM for dirt, scratches and warpage.

OK or NG 

OK: GO TO 3.

NG: Replace DVD-ROM map.

1. Insert same DVD-ROM to make sure same diagnosis result is found as last self-diagnosis.

OK or NG 

OK: Replace NAVI control unit. Refer to "NAVI CONTROL UNIT ".

NG: Replace DVD-ROM map.