How do you replace headlamp switch 1991 Nissan pickup?

To replace the headlamp switch on a 1991 Nissan pickup, first disconnect the negative battery terminal to ensure safety. Remove the trim panel surrounding the steering column, then locate the headlamp switch, which is typically attached by screws or clips. Disconnect the wiring harness from the switch, remove it, and install the new switch by reversing the removal process. Finally, reattach the trim panel and reconnect the battery to test the new switch.