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  1. #1 Installing Factory Navigation 2008 Grand Prix GXP 
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    I just purchased a 2008 Grand Prix GXP and it has every option except engine block heater (don't care) and navigation. I ordered a factory ACDelco GPS/Navigation antenna and I will install it tomorrow in the factory location. I know I need to have the nav unit unlocked but I have a couple of questions.

    Can anyone tell me (without guessing) what the 4th electrical plug is on the back of the nav unit (not counting the radio antenna port)? Port 1 and 2 are the factory radio plugins, port 3 is for the nav antenna and port 4 is for??

    Once I install the nav unit and plug in the (3) know plugs will I need to install anything else to make the nav work as intended from the factory?

    Thanks for your help.
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    Last edited by Cheezehead; 06-18-2013 at 07:23 AM.
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