IHave purchased New Maruti swift VDI car in which I Have installed a SONY XR-CA620 X FM/MW(am)/SW car stereo cassettee player 'm able to connect FM but MW,SW 'm not able to tune 'cose ext. Antina not connected. Can I connict my stereo antina lead with car built in antibna. as per Maruti accessories dealer there is no provision in this car to connect this antina pl guide how to connect and so I can tune MW/ SW stations