SOURCE: Radio Wiring Diagram
Go to www.crutchfield.com.
On the bottom of the page there is a link for product support. On the next page, type "2005 Grand Prix" in the search box and hit enter. The top link shows an image and pinout on models with Monsoon sound systems, the second link for ones without.
Hope that helps! Good luck!
SOURCE: I need a wiring diagram for my 2000 pontiac grand prix
I own a 2001 Pontiac Grand Prix GTP and may be able to help you out if you let me know what specifically you are looking for.
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