is there different harnesses for each radio/ speaker combo? i have the 7 speaker pioneer in mine. im about to replace the head unit so i want to make sure i get the rght one.

 

no onstar - metra gmlan03
with onstar - metra gmlan04

 

Go to Crutchfield.com, plug in your info and it will tell you the exact one you need.

 

ok i got a harness and hooked everything up. do all the aftermarket harnesses require you to run your own acc. wire from a fuse. or did i just get a cheap one?
no big deal now cause everything works like it should.

 

The GM LAN04 harness provides you with an ACC wire.