Navigation System Symptom Troubleshooting

Symptom Diagnostic procedure Also check for 
No picture is shown on the display Troubleshooting  
The picture is missing a color or tone Troubleshooting  
AVN unit buttons do not work Replace the AVN unit.  
Satellite mark in the GPS mark is not indicated Troubleshooting Electronic after market accessories 
Audio driving instructions cannot be heard Troubleshooting Vehicle position does not move on the map 
Vehicle position does not move on the map Troubleshooting