Help Request / Where is the OEM usb control box on a 2011?

Doing an upgrade on a 2011 DC with No JBL, No nav. It does have the USB and Aux port on the panel just below the HVAC knobs.

apparently I need to find the “multimedia ECu” to unplug the USB and connect it to the new stereo setup. I can’t find that interface box. Instructions said it’s behind and to the right of the radio, it isn’t. Tech support at crutchfield said it may be behind the glovebox, accessed by the panel below the dash under the glove box and the box is behind there. I haven’t found it yet. Can anyone confirm?

 

Found it. For reference if you put your head to the front of the truck, look up about where your left foot would normally rest, it’s above the first black box with a harness in it, next to the blower. It’s gray colored.