Navigation System Symptom Troubleshooting - Vehicle position icon constantly leaves road, moves erratically, or is displayed very far from actual vehicle position
Vehicle position icon constantly leaves road, moves erratically, or is displayed very far from actual vehicle position
NOTE:
Check the vehicle battery condition first.
Check the GPS signal reception in an open area.
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 metallic window tinting or other objects that can block the GPS signal. Always do the Map Matching before proceeding with the troubleshooting.
Make sure that the latest navigation software is installed.
1.
Problem verification:

Problem verification
?1.
Park the vehicle in an open area.

?2.
Press the engine start/stop button to select the ON mode.

?3.
Check if the vehicle position icon displays the actual vehicle position.

Does the vehicle position icon display the actual vehicle position?

     
YES
     
     
     
Intermittent failure, the system is OK at this time.?
     
NO
     
     
     
The failure is duplicated, go to step 2.
2.
Determine possible failure area (GPS, others):

Determine possible failure area (GPS, others)
?1.
Check the GPS icon on the navigation screen.

Is the GPS icon missing?

     
YES
     
     
     
     
NO
     
     
     
Go to step 3.
3.
DTC check:

DTC check
?1.
Check for hard error codes.

Are there any navigation DTCs indicated?

     
YES
     
     
     
Go to indicated DTC's troubleshooting.?
     
NO
     
     
     
Go to step 4.
4.
Audio-navigation unit check (substitution):

Audio-navigation unit check (substitution)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Substitute a known-good audio-navigation unit, and check to see if the problem occurs in the same place.

Does the problem occur in the same location each time?

     
YES
     
     
     
Try to replicate the problem in a known-good vehicle. If the problem can be duplicated, the problem is in the map database. Report the problem according to the Navigation Manual under Reporting Errors.?
     
NO
     
     
     
Replace the original audio-navigation unit.?