I own a Nuvi 1490T, similar device.
The way I check JCV is to make a destination involving a major expressway.
Then in tools/settings/system turn the GPS simulator ON, and smulate the route.
On the Map screen, touch the top bar and hit one of the instructions. The screen will show a visual of that instruction.
Keep hitting the arrow on the bottom right of the screen until the Junction View bar lights up.
Then when you touch that Junction view bar, it will display the Junction View to be expected in that point along the route.