ya thats not gonna help idk its obviously not the headunit if my stock one doesnt work either

 

Check the fuses under the hood and if there are any in the dash check them too. I think mine has a fuse panel under the hood and one in an access panel on the side of the passenger side of the dash. Cant remember tho. If you are confused as to what fuse is what, your owners manual has a diagram with labels for each fuse.

 

so when you plug in the stock one all u have is the buttons lighting up?? if thats so than it deff dosnt sound like a blown fuse, if it had a blown fuse than none of it would light up

 

Ya with the stock one all the lights will light up but the screen doesnt work at all. I have fuses on both sides and one under the hood. we were thinkin maybe its a main harness problem?