Vehicle position icon constantly leaves road, moves erratically, or is displayed very far from actual vehicle position

NOTE:

Check the vehicle battery condition first (see 12 VOLT BATTERY TEST ).
Check that the GPS antenna is plugged in.
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 (see MAP MATCHING ) before proceeding with the troubleshooting.
Make sure that the correct navigation DVD color and version are installed.
Inspect the navigation DVD for dirt or damage.
Check any official Honda service website for more service information about the navigation system.
Check the GPS signal reception in an open area.

Check the GPS icon on the navigation screen.
Is the GPS icon white?

YES -Do the troubleshooting for GPS icon is white or not shown troubleshooting (see GPS ICON IS WHITE OR NOT SHOWN ).

NO -Go to step 2.
Go into the System Diagnostic Mode, and use the Yaw Rate test (see YAW RATE ) to check the audio-navigation unit internal yaw rate sensor.
Is the yaw rate sensor OK?

YES -The condition may be normal. Check to see if the condition occurs in the same place in a known-good vehicle with the same navigation software version. If it does, the problem could be in the database. Go to step 3.

NO -Replace the audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).
Go into the System Diagnostic Mode, and use the Car Status test (see CAR STATUS ) to check the VSP signal.
Drive the vehicle, and watch the VSP signal.
Does the VSP signal change from [0] when stopped to [1] when the vehicle is moving?

YES -Condition may be normal. Check to see if the condition occurs in the same place in a known-good vehicle. If it does, the condition could be in the database. Go to step 5.

NO -Go to step 6.
Substitute a known-good audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ), and check to see if the problem occurs in the same place.
Does the problem occur in the same place?

YES -The problem is in the database and should be considered a characteristic of the system. Report the problem according to the navigation manual under Reporting Errors and look for improvements in future databases.

NO -Replace the audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).
Turn the ignition switch to LOCK (0).
Remove the audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ), and disconnect audio-navigation unit connector A (24P).
NOTE:
- Eject all the discs before removing the audio-navigation unit to prevent damaging the CD player's load mechanism.
- Remove the PC card before removing the audio-navigation unit.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (44P).
Check for continuity between audio-navigation unit connector A (24P) terminal No. 23 and body ground.

Fig 1: Checking Continuity Between Audio-Navigation Unit Connector A (24P) Terminal No. 23 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair a short to body ground in the wire between the audio-navigation unit connector A (24P) and the ECM/PCM connector terminal A (44P).

NO -Go to step 11.
Check for continuity between audio-navigation unit connector A (24P) terminal No. 23 and ECM/PCM connector A (44P) terminal No. 29.

Fig 2: Checking Continuity Between Audio-Navigation Unit Connector A (24P) Terminal No. 23 And ECM/PCM Connector A (44P) Terminal No. 29
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), and recheck. If the symptom/indication goes away, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).

NO -Repair an open in the wire between the audio-navigation unit connector A (24P) and the ECM/PCM connector terminal A (44P).