Nav System - External System Not Connected

[BrianP]

I just had my first problem with the navigation system (2007 ES350). The map/destination screens said "external system not connected" and the radio screen read "audio off" while the audio was on. When I shut the car and restarted, it appeared to be OK, but is this the beginning of a problem or just a fluke occurrence?

Thanks.

[SW03ES]

Probably just a fluke. Mine has had some flukey moments over the years...

[UCF3]

It might be a reoccurring issue. Just got my disconnect message from the NAV system after I was troubleshooting my VAIS XM started to give out.

On some of the other forums this issue is reoccurring and nobody has a permanent fix other than replacement