I can't see how power can get to the relay coil unless there is a bridged connection from the switched contacts but even that power has to pass through the ignition switch so it should be cutoff, regardless. The only other active power that I know of is the memory circuit power. It would be interesting to know if the trouble cleared if that fuse was pulled out of the panel under the hood.
The logical suspect for the trouble is the ECU but you already checked that out. I must say, this is a good one one here.
The 11.2 volt reading you took is just about the right difference to indicate there may be a diode being biased on somewhere. There is about a .7 volt drop across a diode in order to turn it on.
Sooo.... after reading your last comment again in post 42 are you saying that the voltage was higher on the relay contacts for the yel/blu or yel/red wires than on the red wire that ties to the fuse? If so, that means the power is coming from something on the other side of the relay contacts, from the opposite direction it should come from. If that is the case which one of the two relay contacts had the voltage on it?
Edited by Cougar, 25 July 2012 - 02:47 AM.