Rear defrost 🫣

[01 monte fan]

I am trying to figure out the issue with my rear defrost.  I have no voltage back at the grid or the plug to the defrost/antenna module. I press the button and the light turns on but I don't hear a click for the relay.  I have tested for voltage at the relay and have 12v on the 30 pin but no voltage on any other pin when the button is pushed on.

I am wondering if it's possibly the hvac control panel. I don't know how power is routed into the relay to know if it's the panel or bcm that supplies the power for the relay. 

I sure hope someone can direct me on where to look next. Thanks for any guidance here!!

Edited 11 hours ago by 01 monte fan