How do you replace light bulbs for heater controls on 2011 Renault traffic?

To replace the light bulbs for the heater controls on a 2011 Renault Trafic, first, ensure the vehicle is turned off and the keys are removed. Carefully remove the surrounding trim or panel to access the heater control unit. Unscrew or unclip the heater control assembly, then replace the burnt-out bulbs by twisting them out and inserting new ones. Reassemble the unit and trim, ensuring everything is securely in place before testing the new lights.