There isn't one, but the harness is fairly easy to access. There is a panel at the bottom of the rear of the center console where you can access it. I've emailed a place that makes custom harnesses about making an obd breakout adapter, I even sent them the schematic and connectors needed. They have completely flaked on me.
Once you have CAN bus access the next issue is getting the CAN messages decoded and logged. I'm fairly certain some have done this and documented it, but I haven't dug into it yet. Do some google and forum searching and I think you will find enough to get you rolling.
