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i cant seem to find a b13 built in japan
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That's because they never made a B13 in Japan.

Perhaps this was your point?
Mine works, in that when I move the lever, it sounds like it moves something and I've tracked the calbe down to a lever it pushes, but I can't tell exactly what it's supposed to do in regards to air flow. Can't tell a difference at any vent with it on or off. Based on tpbishop's reply, I'd assume it just opens or closes a damper that redirects where the air comes from.