How to start the 2008 bmw x5 rear view camera ?

i have a bmw x5 and it has the rear view camera bur when i change the gear to (R) it won't start , only the PDC screen is showing....... can anybody help me ?How to start the 2008 bmw x5 rear view camera ?On the left side of your display, you should see some stuff you can select for turning on/off the camera, and the parking aids. Move the wheel over to it, and press it to turn it on. The owners manual is also a good place to look.