So far as I'm aware (not being a Yorkshire Tyke) the Yorks for "Been" would be "bin" e.g., "Whar's tha bin?"

"Bahn", I'd be prepared to take a small bet, is derived from the Scandinavian. Unfortunately, I only have my Danish dictionary to hand, which is rather different from the original Norwegian (but very close to modern Norske)

However, from that one I find that the word "bane" (pronounced 'bahn-er") means a path, way or track (including a railway track!) - this is fairly apposite to questions about which road you've been travelling on.

Of course, I give no guarantee that I'm correct - this is purely hypothesis. No doubt I will be corrested if I'm wring

(what a lovely link, dody - thanks!)