Navigation System Symptom Troubleshooting - Vehicle icon wanders across the map when driving (does not follow a displayed road) or map vehicle ICON spins

Vehicle icon wanders across the map when driving (does not follow a displayed road) or map vehicle ICON spins
NOTE:
  • This is not the same condition as when driving off-road (or on a fire or logging road).
  • This condition is caused by a loss of map matching from a bad sensor input. Check for aftermarket or other objects that can block the GPS signal. Always perform Map matching before proceeding with the troubleshooting.
Are all the tests OK?
YES -
The system is OK at this time.■
NO -
Repair the affected system. If the problem persist, swap a known-good navigation unit and monitor the condition.■