The brain as computer is not the best metaphor, but it’s the best metaphor we have.
In this light, voices, and hallucinations, are the outcome of subconscious computing processes.
So the question is, do a schizophrenic’s voices pass the Turing test, and if so what does it mean?
Well, it would seem there is no apparent way to test it, short of strapping a schizophrenic to a chair, speaking for a voice in some kind of prophetic trance, while another at a computer decides if it’s real.
But, we do not have to go so far, a schizophrenic’s own internal conversation is enough. And given how often schizophrenics interpret “the voices” as real, we can confidently say, yes, a schizophrenic’s voices usually pass the Turing Test.
Though this probably says more about weaknesses in the exam, than it does about the reality of hallucinations.