The ANN LT are used during the Cockpit Door Check, which is part of the Cockpit Prep. To make sure that the LED strike lights and OPEN and FAULT lights are working as they should.
This is standard Airbus but with the note ¨If required by local airworthiness authorities¨
FCOM 3.03.06 p7
new format: FCOM PRO-NOR-SOP Cockpit Prep - Pedestal