You need to make sure you are tapped into the correct wire. Use a voltmeter to make sure you are getting 12V when the car is put into reverse and then 0V when the car is not in reverse.
I am pretty sure that the purple and black wire from the headunit needs to go to the same orange wire of the car as well the red wire from the rear view camera.
Once all wired you need to go into the settings of your HU and change the camera setting to battery.
Then every time you shift into reverse the 12V from the orange wire will be sent to the HU and let it know to change screens and 12V will be sent to your camera letting it know to turn on as well.
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