Pioneer head unit reverse camera not working

Hello, I have a Mazda CX-9 2010 Grand Touring model. My husband tried to install my pioneer AVIC F980DAB head unit in the car. We purchased the bracket, harness & steering wheel harness. He hooked it all up but there was a few white plugs with no where to plug them in. AND the microphone and more importantly the reverse camera didn’t work.

Upon looking at the guides the wire for the camera was a purple/white wire which was definitely plugged in – but no image.

Anyone have a wiring chart for my car? Or any tips or advice on how to get the camera working. Hubby can easily enough install a new microphone.