I looked at a few schematics and there is an ignition relay on that circuit for the coilpacks. That blue relay could be for that. Saying that I would be taking the multimeter and checking most of your sensors. Start with a coilpack and see if there is a 12v supply on pins 2 & 3. Last 2 left to right looking at the plug dissconected. Also check AFM and oxy sensor, CAS, TPS all of these sensors are off the ignition circuit. They all shouldnt have 12v supply until the ign is on.