Hi Guys, Ive just got my handsfree fitted in my new shape vectra but the fitter didnt know how to get the sound to come through the car speakers so he had to fit an extra speaker. he asked several people but no one would tell him how to do it, vauxhall and the radio manufacturer both refused to tell him ! the radio modell is 2005. does anyone know how to do this

thanks in advance for any help

dave