How do you change the bulb on a Renault Megane Heater Control?

To change the bulb on a Renault Megane heater control, first, ensure the vehicle is off and disconnect the battery. Remove the trim panel surrounding the heater control, then carefully detach the control unit from the dashboard. Locate the bulb holder at the back of the unit, twist it to remove, and replace the old bulb with a new one. Reassemble the control unit and trim panel, then reconnect the battery to test the new bulb.