That may have changed with the 2009 Ridgeline. I don't see any mention of the heater valve in the 2009-13 FSM except, "unless equipped."Then yes, you need to turn heater on. Not all Rigi’s have a heater control valve. Max will make no difference since the heater control valve is either closed or full open, no in between.
Could be some kind of diagnostic connector. Direct power to something they cant get to easily...Power steering pressure switch or something. If it reaches that mounting point then slide it on it. I am flipping through the wiring diagram and have yet to find anything with blu/red wires.I have fog lights, and they work. This doesn't seem to connect anywhere.