How do you replace the ignition key cylinder switch on a Toyota Corolla 86?

To replace the ignition key cylinder switch on a 1986 Toyota Corolla, first disconnect the negative battery terminal to ensure safety. Remove the steering column cover by unscrewing the screws, then locate the ignition switch at the base of the steering column. Disconnect the wiring harness and remove the retaining screws to take out the old switch. Install the new ignition switch by reversing these steps, ensuring everything is securely connected before reassembling the column cover.