Navigation System Symptom Troubleshooting - Vehicle position icon constantly leaves road, is erratic, or is very far from actual position
Vehicle position icon constantly leaves road, is erratic, or is very far from actual position
  1. Check the GPS icon on the navigation picture.
Is the GPS icon white?
YES -
NO -
Go to Step 2 .
Are the yaw rate-lateral acceleration sensor and vehicle speed pulse OK?
YES -
The problem may be normal. Check to see if the problem occurs in the same place. If it does, the problem could be in the database. Go to Step 4 .
NO -
If the problem is the yaw rate sensor, replace the navigation unit. If the problem is the vehicle speed pulse, check for an open in the wire between the navigation unit and the ECM. If the wire is OK, troubleshoot the vehicle speed signal circuit.■
  1. Substitute a known-good navigation unit, 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. Report the problem according to the Navigation System Manual under ‘‘Reporting Errors''.■
NO -