: ,OPS,thanks.supplier helped me solve the problem

i bought a aftermaket one,from a china onlineshop.at present everything looks good,only the reverse camera image cann't switch automaticly when i reverse my car,just waiting supplier's help. this is the one i bought. http://www.autoadas.com/new-mazda-52011-car-dvd-player-with-radiobluetoothtvipodusb...

i installed an aftermarket dvd for my mazda 5,everything looks perfect,but when i reverse my car,the image cann't automatically switch to the reverse camera,anyone know this? below is the system i installed. http://www.autoadas.com/new-mazda-52011-car-dvd-player-with-radiobluetoothtvipodusbsd-p-331....