The green plug goes to the wiper switch. Will have +12 at the plug but you will have to get the negative wire at the wiper switch to connect to your switch. That plug was for the wagons rear washer tank or the JDM sedan washer.
I know this because I have done the JDM rear glass conversion. Like I said teh mod is posted ant scooby mods. Look closely at the pictures. Ther eis and extra wire that was cut then re connected. That is your wire you need. I made a mistake, and was going to mount a pump in the rear, but then i found that there was a spot up front. Sorry I didn't understand what you were trying to say before. I also love these guys who have all the wrong answers. Like the "hit the mist button it works both pumps"- It did I'm sure for him, then he woke up.