Inverter Coolant Pump question (not working)

Is there an electrical reset or something needed for the inverter coolant pump if I've disconnected the 12V battery for a while? I've got a 2004 Prius.

I don't see any of the "waves" in the coolant reservoir when the engine is on and I've been plagued with suddenly on multiple warning lights (Big Red Triangle, VSC and small brake symbol). If I let it sit overnight *sometimes* the VSC and small brake symbol don't light when driving but the triangle stays on. Resetting the emergency warning lights via disconnecting the negative lead from the 12V battery will turn off the lights. After the "battery reset," the lights often stay off for a day or even two but always return.

Why wasn't I taking this more seriously before?

a) This began happening after a day when I removed and replaced both tail light assemblies, removed and put back the one week old Yellow Top battery (dropped a screw under it - aaaarrrrggg) and took out the MFD to implement Hobbit's fix.
b) I had the pump replaced at the dealer's about a month before that (due to the recall).
c) I didn't find the info connecting the multiple warning lights with the inverter pump until last night.

I've driven the car for at least 2 weeks now almost daily without any obvious negative impact, although my wife literally just told me as I was typing the above that she thought she smelled something burning in the car driving it home tonight. The delay in the warning lights coming on would make sense now if nothing triggered until there was overheating. It's been a pretty cold winter for Vancouver, so that might have helped.

I had written the warning lights off to something screwed up in the electrical system due to my work that day. But now I'm pretty sure it isn't lying to me.

So, since the pump is supposedly new from the dealer and I had no warning lights before my day of work, is there something I need to do electrically to reset the pump? And if not, what are my next steps?

Thanks everyone!