Hi Dave,
Sorry to hear of the trouble you're having with the Curt TriFlex NEXT Trailer Brake Controller # C24VV, as those are quite a few issues. It's pretty odd to have all of that at one time, but it's pointing to bad wiring to the 7-way on your 2007 Lexus GX470. I think it's very likely a ground issue or damaged brake wire going to the 7-way. That is going to be very difficult to trace but there is wiring going to the 7-way you can take a look at, or go to the dealer and have them examine... view full answer...
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