How do you replace the ignition switch on a Oldsmobile achieva?

To replace the ignition switch on an Oldsmobile Achieva, first disconnect the negative battery terminal to ensure safety. Remove the steering column covers by unscrewing the screws, then locate and detach the ignition switch from the column. Disconnect the wiring harness from the old switch, install the new switch in place, and reassemble the steering column covers. Finally, reconnect the battery and test the new ignition switch to ensure it functions properly.