Heater Relay low voltage coil input?

[Isaac1]

The air conditioning / heater blower stopped working on my 2007 Yaris 3 door hatchback last week. At first I assumed it was the blower motor or the resistor (resistor looked nasty and corroded when I removed / replaced it. Afterward there was still no power getting to the blow so I checked the various fuses, and all of them seem to be good. After much digging I have found the blue heater blower relay in the interior fuse panel is only getting about 5.5 volts DC to the coil input, which is not enough to trip the relay, All other voltages seem to be good, I have also checked the ignition relay, and have pulled the harness from the ignition switch under the steering wheel.

If I manually jumper power to the green ign wire at the ignition switch, I can hear a pair of relays clicking with a slight delay between them, the first is the pink ignition relay in the interior fuse panel by the drivers left leg, then there is second relay that sounds like it is up under the center dash area somewhere. When I remove power from the green ignition wire there the pink relay clicks off first, then about a second later the mystery one clicks, it is at this point that the 5.5VDC I am getting to the input coil side of the Heater relay clicks off to 0 VDC. I am assuming my problem is bad contacts on this second mystery relay, can anyone help me find it?

Looking online it appears there are no relays on the Yaris Air Conditioner amplifier board, though I plan to check that one tomorrow, as I ran out of day light today before getting to it.

Thanks

p.s. bypassing the heater relay lets the blower work.