Just wanted to raise this thread back from the dead.
I really want to know the outcome as I'm sure there are others as well. If for anything, to benefit others from going down the same path. I'm currently battling a mysterious draw to one of my Odyssey batteries which I'm positive is my own doing. But I don't really want to tamper with the factory charging system if I'm going to end up buying an ECU.
Hi Duc,
I addressed this issue back in March but approached it another way; Here's that thread: http://www.toyota-4runner.org/5th-gen-t4rs/192198-switch-not-switch.html. If you click on the link I'll be happy to discuss and elaborate on the issue over on that thread since I've already covered most of it.
Cheers!