What/where is the "smart key disable button", please?
The only button I know of is the one inside the glove box at the left front side of the box. It disables the trunk remote unlock for valet parking. You activate that button, lock the glove box with the steel key, and take the steel key with you when you leave the car to be parked. The valet can start and drive the car with the smart key, but cannot unlock the glove box or the trunk.