For anyone reading this, this is not only with Nissans. It is common practice, when you disconnect an airbag switch because you're disassembling the dash, DO NOT cycle ignition. If you must, hold the dash piece up to the dash just enough to snap the airbag harness back into place. Proceed as needed.
Will it trip an airbag light in EVERY car? I am positive it will NOT. But I doubt anyone has every car that's safe memorized....