I just installed a F700BT in my truck today, I've got an 07' Seirra. I hooked my pre-outs for the amp to the subwoofer RCA plugs coming from the back of the unit, and then wired the stuff up from the 'power plug' up to the matching colours, red to red, white to white, etc etc.
Theres no sound playing out of any of my speakers accept the subs. All you can hear is the low base notes. Go to the radio and you hear no lyrics, music, or anything, on the map you cant hear any voice, use the bluetooth and you cant hear anything. And yes, the volume is turned up.