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To do this go to"menu", click "display", choose "rear camera options" and uncheck the box to view rear camera while in reverse. You will also want to disable the rear camera option (since your vehicle did not come with navigation it also did not come with a rear camera) or else you will get an error message about your rear video system.
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This allows you to use the other visible disk drive on the system for CD's, MP3 disks, and even DVD movies (which can only be viewed while in park and only available on units with DVD movie capability). The screen folds down and the navigation disk is inserted. The map disk is inserted behind the screen of the navigation system. The nav will need a navigation map disk to function as a navigating system but you will be able to use the the radio and all of the other features of the navigation unit. If everything works properly you should be up and running at this point! When the unit first turns on you should be greeted with the logo from the make of your vehicle (in this case GMC). If the navigation unit is functioning properly then please move on to the next step. Keep in mind if you are inside of a garage or around any large building the antenna may not be able to communicate with the satellites. It will however tell you your current GPS coordinates. You will not be able to use the navigation until you have navigation disk.
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Test the unit to make sure everything is working properly. Once you are all plugged in (don't forget about the am/fm antenna!) go ahead and turn the key on. The plugs are slotted to ensure that the correct wiring goes into the right plug. Do not be alarmed, this is correct and you cannot plug the wires into the wrong place.
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You will find you only have two wiring harnesses available. You will see the navigation system has 4 inputs on the back for a wiring harness to go into. Plug the radio wires into the navigation unit. Plug the antenna into the navigation system and set it on the dash. Remove the old radio and the heat control unit (which must be removed before the radio). For a good practice we are going to test the navigation unit before going any further.