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1. yes you'll need a steering wheel adapter like the aswc-1 for toyota, i cant tell you about carplay but i have a pioneer headunit with steering...
this can be done but the problem is the wiring harness is different from jbl and non jbl prius. meaning you will have to cut the wire harness out...
clean install.. what did you do with the steering wheel control??? also stay tune for my prius with 4 12s