2007 tacoma adding rear speakers

Do you guys know if the 2007 Tacoma Reg. Cab comes with rear speaker wiring already there? I just bought this truck and when I turn the fade over to the rear speakers(Silence) ... I checked , there are no speakers back there. So, I went and bought some Infinity speakers with the speakers boxes that will fit back there but I am unsure about whether it is already wired or do I need to get into the dash and wire these things myself. Any help is very much appreciated!Richard Tunnell

Thanks man!Richard Tunnell