Where could I find C214 connection.

 

Looks like it is located in the vicinity of the parking brake. Listed as located on Left Hand "A" pillar. Could be up under dash its for the windshield wiper/washer controls and I do not know what else.
Reference 2007 Ford F-150 Wiring Diagrams Page 151-15 for physical location. Page 150-25 for "pin out" information. Color is green. Its an eighteen pin connector. Page 81-1 for electrical schematic