yes & no. the fogs are controlled with the bcm. the kpthingy is intercepting the low voltage control from the switch & independenty controlling the fogs. same can be done with relays & stuff, but much easier to just pop the kptech thing out of the package & follow the instructions than engineering & figuring it out for most. always have the option of wiring in your own high voltage switch yourself too, but to use the factory switch some sort of interface would def need to be built.