Hello and thank you for using Just answer! I'm Billy and i will assist you with this. Feel free to ask if you need any further info.
I will first include the related diagram:
click here for details
In my opinion, the yellow blue wire, is shorted somewhere causing this......
You may simply hook a new wire on related pin, and remove the old one....hook the new one on fuse box, relay and wiper motor....
PS: the relay box......the only relay having 8 legs is the wiper relay.
Thank you for trusting JA and myself.......get back to me if further info is needed.....positive feedback and bonuses appreciated...http://www.justanswer.com/car/expert-billy/