While I'm not sure, to get access to the screws you need, you may need to remove the steering wheel. Since this contains the airbag, if you're not comfortable working around one (since .. explosive rocket fuel), you might want to get a mechanic friend to help you out.
Yes this is what I am trying to determine. From the looks of it I hope no steering wheel removal. I may try to fix the switch itself. If I press the center or one edge the pump does not activate. If I press the one edge, Presto! everything works.
I would treat it as if you removing the steering wheel and dis-arm the AirBag, which I believe would be via disconnecting the battery. Which considering the electronics of the RL I'd do just because your working on electrical parts.
I'll try a few searches later I believe someone has done this and I know there are threads on working on the steering wheel
I have never done it on a Ridgeline, or any Honda come to think of it, but I have replaced more than a few in my time.
Its usually has been easier than expected. A few screws a plug or two.
I have never had to remove a steering wheel to do it. Again, never done this on a Honda, but I hope I was of some help.
You scared me with the steering column removal but it appears that the unit replacement only involves removing a ton of trim clips and a few connectors. I will but a replacement but may continue to live with the old unit for awhile. A direct press of the washer button yields no results but if I press the very edge I still make contact. It may be worth dissecting the switch itself in place to see if I can get around replacing. Seems like a cheesy little switch that requires a whole unit replacement.