RETENTION OF FACTORY REAR-SEAT ENTERTAINMENT/VIDEO SYSTEMS WHEN REPLACING AN ORIGINAL HEAD UNIT

摘要

The retention of factory rear-seat mobile video systems is of big concern when replacing an original head unit with one from the aftermarket. There are a number of different factory video systems and the degree of communication between factory head unit and video controller varies greatly. Although this discussion is not likely to be on the radar of most AES members, it just might prove interesting to see the different methods the aftermarket uses to overcome the challenges supplied by automakers. It is often the case a factory video system will not turn on after removal of the factory head unit. An immediate concern is how to send the appropriate "turn on" signal to the video system. Sometimes the video system needs only to see an analog signal on one particular wire to activate, other times there is a data signal controlling the turn on action. Many vehicles require completely ad hoc solutions, often involving the relocation and rewiring of the factory head unit. While this may seem an intimidating modification to many, the wiring is entirely straightforward. There are also applications popular enough to have aftermarket parts available which communicate to the vehicle's data bus directly.