It looks to me that if relay X-08 had problems several functions couldn't work, but the usual sounds occur when the Ready light comes on and the lights for AC and heater fan operate.
I am having trouble relating the drawings to the wires on my car. I can probe the harness end of the E-03 connector rather easily, but find it very difficult to do so on the OBC end. With key off: pins 1 & 7 have 2 vdc, pin 2 has 4vdc, and pin 8 has 12 vdc. With Ready: pin 1 is 2.24, pin 7 2.75, pin 2 4, and pins 3,, 8, 12, 13 have 12 v. Those pin numbers don't agree with the drawings I've seen.
It seems to me that the problem is in the dc-dc converter and not elsewhere, with the possible exception of the EV-ECU.