Wow, that wiring is a mess...
I am not sure what wiring diagram you used, but none of them show those black wires coming from the OBC tied together.
This diagram is from a 2007 Precedent, which I believe is the same as Your 2005.
Precedent 2007 Wiring Diagram
Also, double/triple check every connection before applying power, both the OBC and Controller can be easily damaged by a miss-wire.