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So while I was on deployment my car battery died and my wife had it changed out. It is unclear if the MMI quit working before or after the new battery, but I have tried almost everything to figure it out. When you turn the car on, the screen is black and the buttons on the control module do not light up. I have checked every fuse in the car and I even removed the Amplifier and unscrewed it to see if the curcuit board was damaged and it was all in good condition. I do not have access to a scanner to run diagnostics and I do not have the money to take the car to the shop.
 

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I am having issues with certain parts of my MMI not working and believe its due to a low battery. The car has a system that shuts things down in order to be able to start...I would check the battery is correct for your car..also, they need to be programmed so they charge correctly.
 
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