Right so I soldered it back together, end up having two breaks in it, bit fidly to do and had to scrape the insulation off wire first. Put it back on and still wouldn't start. The wires weren't quite in the plastic ring properly so I tucked them back in a bit better and it started! I unplugged the IMMU while the car was running to make sure I can drive it to Nissan without the car stopping if my soldering falls apart. Nothing happened when I unplugged it so I guess it wont hurt for the wife to drive it to the dealer as long as she doesn't turn it off! Thanks TPC, im hoping it wont cost me that much but I guess i'll prepare myself now for the bill.