Ms250560

i have a 2007 Lexus Gx470 Non Nav, i install replacement apple car play aftermarket stereo Alpine ILX-409 with ready harness that i bought in crutchfield, all function are working including steering control back up camera, the only problem is there is no sound i did all the the guy from crutchfield told me but still i cant fix it do you or anybody here experience same issue that i have? i hope some body will help me fix the issue thanks.