OK. So ran all the tests on this module. There were about 5 or 6 tests.. they all seemed to go through OK. The dosing pump test made the clicking noise. I then cleared the fault code and it remained clear (hooray). I started the car (AC and heated seats on, coolant < 70 and ambient outside temp about 2 degrees) and it seemed to fire up OK. Smoke from under the front of the drivers wheel. No more fault code either. The fault seems to have cleared itself. Must have been due to an extended period of inactivity I think.
I still don't have the Aux Heating menu in the MMI though, so I might look into coding that in. Would be handy just for the ventilation function to vent the interior in the summer when leaving work.
Thanks for all the input. False alarm I think... Sorry guys..
