Battery died put in a new one now radio wont come on

You will need to reset the wireless code to turn on the radio. Removing the battery indicates to the radio that it is being stolen and the code cuts in to make the radio worthless. The code may be in the owners hand book in the wireless section. If it is not and the radio is factory fit then the dealer will have a record of the code for the wireless fitted to that vehicle in the factory. Contact dealer customer support and get it from them