How do you change back light bulbs in heater controls on peugeot 306?

To change the backlight bulbs in the heater controls of a Peugeot 306, first, remove the surrounding trim panel carefully to access the controls. Disconnect the control unit from the dashboard and locate the bulb holders on the back of the unit. Twist and remove the old bulbs, then replace them with new ones, ensuring they are properly seated. Reassemble the control unit and trim panel, and test the lights to confirm they work.