Question: 

NavTool Apple CarPlay Not Working Activating

Upon connecting an iPhone to NavTool Interface Via USB Carplay Not working or Activating

Answer:
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1. Make Sure Siri of iphone is activated in setting

To use CarPlay, Siri must be enabled on your iPhone. Go to Settings
Siri & Search, then turn on Press Side Button for Siri (iPhone X and later) or Press Home for Siri (other models).

2. Make sure iphone is connected to navtool USB with usb cable only 

Do Not Use Apple AV adapter as it will block connection to carplay , must use just plain USB Lighting cable, same cables as you would use to charge the phone