JR local buses

I've got a 14-day JR pass sorted out and I'd like to use the local JR buses with it when I'm in cities like Tokyo, Osaka and Hiroshima. I can't find anything about route maps and schedules for such buses on the web though. There's plenty of info about JR overnight and highway express services which, of course, the pass doesn't cover any more.

The only bus service covered by the pass I've found any info about on the web is a sightseeing loop bus in Hiroshima. Surely there must be info about JR buses somewhere?