No Power to Datalink Connector

I have a 2006 Columbia 14l detroit with the diag connector on the left side of the driver seat. There is no voltage on the 12volt feed, had a qualcom in it that was removed, but had power untill some point after that. All the old qualcom wiring is unhooked except the two datalink wires that attach under the left access panel behind the drivers door. Checked all the fuses I could find but all are ok, and all is well with the rest of the truck

 

Looked all over for it but can't seem to find a fuse box back there

 

Found it, thanks to for the replies, thought the fuse box was a module or the like. Fuse was blown and all is well