Disconnect the battery negative terminal. For door-mounted loudspeakers, remove the door inner trim panel, disconnect the wiring connector from the door speaker, undo the three securing screws, and then withdraw the loudspeaker from the door panel. Refit the inner door trim panel in reverse order of removal. For pillar-mounted loudspeakers, remove the relevant A-pillar trim panel, release the retaining clip, and withdraw the speaker from the A-pillar. Disconnect the wiring connector and remove the speaker, then reassemble in reverse order of removal.