Vehicle position icon constantly leaves road, moves erratically, or is very far from actual position
Vehicle position icon constantly leaves road, moves erratically, or is very far from actual position1. Check the GPS icon on the navigation picture.
Is the GPS icon on the map screen?
YES - Do the troubleshooting for GPS icon is white or not shown.
NO - Go to step 2.
2. Go into the Diagnostic Menu, and use the "Yaw Rate" test to check the yaw rate sensor.
3. Go into the Diagnostic Menu and use the "Car Status" test to check the vehicle speed pulse.
Are the yaw rate sensor and vehicle speed pulse OK?
YES - The problem may be a normal characteristic. Check to see if the problem occurs in the same place. If it does, the problem could be in the database. Compare to a known-good vehicle under the same conditions. If you can duplicate the problem, report it. Refer to the Customer Assistance section of the Navigation User's Guide, "Reporting Errors".
NO - If the problem is the yaw rate sensor, replace the navigation unit. If the problem is the vehicle speed pulse, troubleshoot the vehicle speed signal circuit.