2006 pontiac g6, hardwire radio

You will lose the chime functions. You will have to find a switched 12 volt source in the fusebox. I feel your pain about having to shell out the 100 bucks or so for the adapter. If you insist on hard wiring it, make sure you cut it far enough back so you can reconnect the harness to put the factory radio back in the car.      WIRE          COLOR          POLARITY          LOCATION                Battery          RED / WHITE          (+)          RADIO HARNESS                Accesory                          Ground          BLACK/ WHITE          (-)          RADIO HARNESS                Power Antenna          PINK          (+)          RADIO HARNESS                LF Speaker (+)          TAN                LF Speaker (-)          DARK GREEN                RF Speaker (+)          DARK GREEN                RF Speaker (-)          LIGHT GREEN/ BLACK                LR Speaker (+)          BROWN / WHITE                LR Speaker (-)          BROWN                RR Speaker (+)          DARK BLUE                RR Speaker (-)          TAN                Amp Location          MOUNTED UNDER REAR DECK                Steering Cntrls          OPTIONAL                Speed Cntrl          YES                Radio Security          YES