https://www.ifixit.com/Guide/SmartNav+4+false+contact+repair/78474
SmartNav 4 false contact repair - iFixit Repair Guide
Use this guide if the module behaves incorrectly or if the device does not mount properly.
smartnavfalserepairifixitguide
https://support.garmin.com/en-IE/?productID=87581
2011 Paccar SmartNav | Garmin Support
The Garmin Support Center Ireland is where you will find answers to frequently asked questions and resources to help with all of your Garmin products.
paccarsmartnavgarminsupport