Navigation System Symptom Troubleshooting - Vehicle position icon wanders across the map when driving (does not follow a displayed road) or map vehicle ICON spins
Vehicle position icon wanders across the map when driving (does not follow a displayed road) or map vehicle ICON spins
NOTE:
Check the vehicle 12 volt battery condition first.
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 do the Map Matching before proceeding with the troubleshooting.
Check the connectors for poor connections or loose terminals.
1.
Problem verification:

Problem verification
?1.
Test-drive the vehicle in an open area, and check if the vehicle position icon displays the actual vehicle position.
NOTE: Make sure that a known-good vehicle's navigation can follow the displayed map in the test area.

Does the vehicle position icon wanders across the map?

     
YES
     
     
     
The failure is duplicated, go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time.?
2.
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 3.
3.
Determine possible failure area (audio-navigation unit, BACK LT line):

Determine possible failure area (audio-navigation unit, BACK LT line)
?1.
Go into the System Diagnostic Mode, and use the Vehicle Status diagnosis to check the BACK signal.

?2.
Shift the transmission to R position/mode.

Does the BACK signal change from [0] to [1] when the transmission is shifted from P position/mode to R position/mode?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
Go to step 4.
4.
Open wire check (BACK LT line):

Open wire check (BACK LT line)
?1.
Shift the transmission to Neutral or P position/mode.

?2.
Turn the vehicle to the OFF (LOCK) mode.

?3.
Disconnect the following connector.
Audio-navigation unit connector C (32P)

?4.
Turn the vehicle to the ON mode.

?5.
Shift the transmission to R position/mode.

?6.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Audio-navigation unit connector C (32P): disconnected
Test point 1
Audio-navigation unit connector C (32P) No. 15
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
     
NO
     
     
     
Repair an open in the wire between the audio-navigation unit and the under-dash fuse/relay box.?
5.
Audio-navigation unit check (substitution):

Audio-navigation unit check (substitution)
?1.
Shift the transmission to Neutral or P position/mode.

?2.
Turn the vehicle to the OFF (LOCK) mode.

?3.
Substitute a known-good audio-navigation unit, and check to see if the problem occurs in the same location.

Does the problem occur in the same location each time?

     
YES
     
     
     
Try to replicate the problem in a known-good vehicle (same model, year, and trim). If the problem can be duplicated, the problem is in the map database. Report the problem according to the Navigation System Manual under Reporting Errors.?
     
NO