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what year is your car?newer cars 1999 and up the radio wiring harness goes thru the ecm (electronic control module).if that head unit is not supported it wont work correctly.in a bad case senario the head unit could damage the ecm.
If this is the model fitted in a TOYOTA then the code is only available from the Main Dealer or a Decode Specialist (or your local Car Radio / Audio Store) who will connect a laptop to read/recode the memory chip