Ok you guys on here who knows Jason and know about the Harnesses he made
so that we could hook up the 02 and newer denso units in a 2001 and older caddys

im thinking about purchasing a 2003 or 04 Seville in the next year
But i was wondering my navi unit will i have to change the harness out again
or can i use the harness he made
or do i not even need a harness at all with the 02 models and newer ?

thanks

also if i get a 04 that has onstar can i use the Voice Control Comands on the Navi unit since the car is wired ?


thanks