I haven't read (and would prefer not to for reasons LWN has discussed previously) this set of claims. But does it ever talk about a housing /not/ mounted in the dashboard?
TomTom's main range of products mounts on the windscreen glass, which is clearly not the dashboard. The usual construction of patent claims is to either add to or expand on the first claim (which is nearly always so trivial it should never have passed examination), but they sometimes miss a trick. It would be amusing if one of their patents is rendered useless by a lawyer's assumption that "mounted in the dashboard" was how new devices would inevitably be added to a motor vehicle. A lot of unusual engineering solutions in the everyday world are the way they are, despite being non-optimal, to sidestep the wording of a patent.