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I agree that if there is no wireless connection, the hack attempt would fail. However the other control modules (ECM, TCM, BCM, etc) would still be connected to a common bus that would allow them to communicate with each other. It would be no different than if you had 4 PCs connected behind a router and then disconnected the router. The PCs could still talk to each other but not the outside world. While Nav gets outside info, I don't think that Nav has the capability to control other driving/control functions(yet).
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