Not sure what this device is for, but it resembles the card reader devices that are sometimes seen in the back of TV's or computers I have a feeling it might be something to do with  a vehicle's transmitter that give your vehicle a non-stopping clear access on motorway tariffs, I exposed the unit today only to find lots of unidentified cables coming from the unit and to a inside plastic aerial cant see where the cable's disappear too......anyone had this problem with their Alphard ?

Yes, it’s a Japanese road toll system. What problem is it causing? Just disconnect the plugs but I’d advise against cutting wires or pulling them out as you never know what else is connected or what could end up getting disturbed etc.

 

you’ll probably also find a Japanese-specific GPS unit and a VICS system which provides traffic updates on Japanese roads only. All of this stuff is redundant in UK.

Ps I use the residual card slot in the dash to hold a couple of petrol loyalty cards, well, it might as well be useful for something.