installed it, but I have 1 issue with relay - it works with 6v probably and it's not plug and play. red cable is for head unit and is only described on item's site - need to solder. blue cable is for reverse light + and also need to solder. relay has to go if you use 12v - solder black, red, blue cables to bypass relay and it works with Mazda NB1 audio system. wish it was in instruction or description
Relais causes delays in starting the camera meaning it does not work. Only power the camera with red/black wire and connect the video to the back of the radio and it will work.