Well in manual it won't automatically tell you about problems.

Try this when driving in a TM monitored area (you can tell by the blue
cameras pointing up and down the road); press the TM button and it should
tell you :-
   a) What road you are on (with the caveat the road number will truncate
to 3 numbers if it has more)
   b) If there are problems, if not it well tell you so (i.e. all clear)

Don't forget not all roads are covered just the major routes

The above is based on my experience with the system fitted to my 2000
Xantia; YMMV.
I haven't bothered renewing for a couple of years as I have little use for
the system so some things may have changed.