DTC Troubleshooting: 1001

DTC 1001:
 FROM System Info Error
NOTE:
  1. Turn the ignition switch to LOCK (0), and then back to ON (II).
Is DTC 1001 indicated?
YES -
Replace the navigation unit, because abnormality of each system in the Flash-ROM.■
NO -
Intermittent failure, the system is OK at this time.■