IG2 "Ignition" Relay Location

Hi there, 2006 Prius (Gen-2): does anyone know WHERE the IG2 "Ignition" Relay is located? - Something is draining my 12V battery, when I pull the AM2 ("Ignition") fuse, the problem ceases - 1st suspect is a jammed IG2 Relay, but I can't find it! - Thanks in advance..

 

Update: OK, I've established that it's (apparently!) part of a 'Integration Relay Unit' comprising a PCB which apparently sits underneath/behind the main fuse block.. will strip it tomorrow & verify