For your airbag monitors . If there's no weight on the seat that airbag should not deploy on that side. Unplug the wires , you should get an airbag code .

 

Just like any vehicle, most of the wiring is there, regardless of the "trim" level; just the actual components are missing. Power/heated seats, roof lights, grille lights, trailer brake controller...makes little sense to have multiple wiring harnesses on the assembly line.