The front seat may be optionally fitted with a special heating system (consisting of two heater elements located in the cushion and squab): these heat the seat to ease the discomfort of entering a cold passenger compartment in very cold weather, e.g. when the car is left outside for long periods during winter.The seat heating circuit is operated by a switch on the actual seat and is protected by a special fuse and controlled by a relay which supplies other services controlled by the ignition.