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Not sure "who" told you that but look around, tons of us have done it and it works fine. Sounds like a plug was left unplugged to me.
Here's a "proof" pic that it works!
Thank for responding dude the lights behind the buttons directly under the original info screen dont even light up. I was told that the maitinence functions run through the factory head unit and would have to tie in the oem HU for it to work
I got my new head unit installed all i have on the original screen is the outside temp,and the hvac, no gas mileage,maitinence.....how can i make this work