Sharp

Hi, I have recently bought a SHARP GX15 with bluetooth and I am trying to link it to the touch screen system in my car. I have a LEXUS 300GS which allows me to make and answer phone calls through the speakers in the car. I have managed to link the bluetooth so I am able to receive calls but I can't transfer my phonebook to the car computer system. Does anyone have any ideas?? When I follow the instructions in the handbook, the screen just flashes 'Check Mobile Phone'. Please help!