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 (BACK LT line, others):

Determine possible failure area (BACK LT line, others)
?1.
Go into the System Diagnostic Mode, and use the Car 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 or N (Neutral) position/mode to R position/mode?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Go to step 6.
4.
Determine possible failure area (VSP line, others):

Determine possible failure area (VSP line, others)
?1.
Shift the transmission to P or N (Neutral) position/mode.

?2.
Go into the System Diagnostic Mode, and use the Car Status diagnosis to check the VSP signal.

?3.
With the help of an assistant test-drive the vehicle, and watch the VSP status.

Does the VSP change from [0] (stopped) to [1] (driving) as you drive?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
Go to step 7.
5.
Audio-navigation unit check:

Audio-navigation unit check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
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
     
     
     
Replace the original audio-navigation unit.?
6.
Open wire check (BACK LT line):

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

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

?3.
Disconnect the following connector.
Audio-navigation unit connector B (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 B (32P): disconnected
Test point 1
Audio-navigation unit connector B (32P) No. 15
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
     
NO
     
     
     
Repair an open in the wire.?
7.
Determine possible failure area (VSP line, others):

Determine possible failure area (VSP line, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS, and wait more than 1 minute.


?3.
Disconnect the following connector.
PCM connector A (51P)

?4.
Turn the vehicle to the ON mode.

?5.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
PCM connector A (51P): disconnected
Test point 1
PCM connector A (51P) No. 25
Test point 2
Body ground

Is there about 5.0 V?

     
YES
     
     
     
The VSP wire is OK. Go to step 8.
     
NO
     
     
     
Go to step 9.
8.
PCM check:

PCM check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Reconnect PCM connector A (51P).

?3.
Raise the vehicle on a lift.

?4.
Turn the vehicle to the ON mode.

?5.
Block the front tire of one side, and rotate the front tire slowly that is not blocked.

?6.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode, with the front tire slowly rotating
Test point 1
Audio-navigation unit connector A (24P) No. 22
Test point 2
Body ground

Does the voltage pulse between 0 V and 5 V as you rotate the tire?

     
YES
     
     
     
     
NO
     
     
     
9.
Open wire check (VSP line):

Open wire check (VSP line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
PCM connector A (51P): disconnected
Test point 1
Audio-navigation unit connector A (24P) No. 22
Test point 2
Body ground

Is there about 5.0 V?

     
YES
     
     
     
Repair an open in the wire between the audio-navigation unit and the PCM.?
     
NO
     
     
     
The VSP wire is not open. Go to step 10.
10.
Shorted wire check (VSP line):

Shorted wire check (VSP line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Audio-navigation unit connector A (24P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector A (51P): disconnected
 
Audio-navigation unit connector A (24P): disconnected
Test point 1
Audio-navigation unit connector A (24P) No. 22
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to body ground in the wire.?
     
NO