Disconnect the negative (-) cable from the battery and cover the terminal with insulating material. Prior to disconnecting the battery, read the battery disconnection cautions provided in the warnings and cautions. Remove the lower steering column cover and the protective paint covering the ignition switch fasteners, then remove the fasteners. Detach the ignition starter switch in the indicated direction, open the lock in the specified direction, and disconnect the plug from the ignition starter switch. For installation, reverse the removal process, ensuring to correctly align the switch drive to the steering lock and secure the switch fasteners with paint or lacquer after installation.