First, connect the output of Reverse Camera(audio&video cable) with the input of NAVISKAUTO Headrest.
If you use the Adapter cable to power-up the Headrest.you will not use the AV cable above,you may connect the AV Cable to the corresponding interface of Reverse Camera.
Second,on the Headrest,select AV 1 or AV2 mode.If you use the Adapter cable,select AV 1 mode,if use the 3.5mm AV interface,select AV 2 mode.Then you can watch the input video on the Headrest.