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I connected the K line to an oscilloscope and got a constant 12v out, no evidence of a digital signal on any of the pins on the connector. Do I have a dud OBD or what...
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OK - that's strange, the ELM should at the least generate some signals on the K-Line in Auto mode.
The line does actually idle high too.. do you have enough resolution on your oscilloscope to see what might be minor changes?
What software did you use to command the ELM whilst the oscilloscope was attached?
(There won't be any change on those pins without a scan tool communicating).