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 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, 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 DVD color and version are installed.
Inspect the 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 GPS icon is white or not shown troubleshooting (see GPS ICON IS WHITE OR NOT SHOWN ). ■

NO -Go to step 2.
Turn the ignition switch to LOCK (0).
Connect the HDS to the DLC
Turn the ignition switch to ON (II).
Check for DTCs with the HDS.
Go into the Diagnostic Menu, and use the Yaw Rate test (see YAW RATE ) to check the 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 7.

NO -Replace the navigation unit (see NAVIGATION UNIT REMOVAL/INSTALLATION ).
Go into the Diagnostic Menu, and use the Car Status test (see PC CARD INFO ) to check the vehicle speed pulse (VSP) signal.
Are the yaw rate sensor and vehicle speed pulse OK?

YES -The condition may be normal. Check to see if the condition occurs in the same place in a known-good vehicle. If it does, the problem could be in the database. Go to step 9.

NO -If the problem is the yaw rate sensor, replace the navigation unit (see NAVIGATION UNIT REMOVAL/INSTALLATION ). If the problem is the vehicle speed pulse, check for an open in the VSP wire between the navigation unit and the PCM. If the wire is OK, substitute a known-good navigation unit (see NAVIGATION UNIT REMOVAL/INSTALLATION ), and recheck. If the symptom/indication goes away, replace the original navigation unit (see NAVIGATION UNIT REMOVAL/INSTALLATION ). If the symptom/indication goes away, replace the PCM (see PCM REPLACEMENT ). ■
Substitute a known-good navigation unit (see NAVIGATION UNIT REMOVAL/INSTALLATION ) with the same navigation software version, 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 System Owner's Manual under Reporting Errors and look for improvements in future databases.

NO -Replace the original navigation unit (see NAVIGATION UNIT REMOVAL/INSTALLATION ). ■
Disconnect the navigation unit connector A (8P) and the PCM connector A (49P).
Check for continuity between navigation unit connector A (8P) terminal No. 6 and body ground.

Fig 1: Checking Continuity Between Navigation Unit Connector A (8P) Terminal No. 6 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 navigation unit and the PCM.

NO -Go to step 11.
Check for continuity between navigation unit connector A (8P) terminal No. 6 and PCM connector A (49P) terminal No. 30.

Fig 2: Checking Continuity Between Navigation Unit Connector A (8P) Terminal No. 6 And PCM Connector A (49P) Terminal No. 30
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -If the symptom/indication does not go away, update the PCM (see PCM UPDATE ), if it does not have the latest software substitute a known-good PCM (see PCM REPLACEMENT ).

NO -Repair an open in the wire between the navigation unit and the PCM.