TMC reception is dependent upon station and signal and location of course, but regardless, you should be able to turn it off. Normally, when calculating a route, you can chose the type of route - whether the route is dynamically routed dependent upon traffic conditions for example - or semi-dynamic or ignores them all together.
But for the general TMC, you should be able to turn that off.
The TMC icon, at the bottom left of the screen, may
appear in 3 different forms:
- No TMC station available,
- TMC station available, no message on route,
- TMC station available and messages on route
(if guidance is active).
So Press the TRAFFIC button once, to show any TMC messages you have received (there may not be any).
Press the TRAFFIC button again to see options for the various settings.
It should all be on page 9.53 of the handbook.