The power supply to both seat heaters O40 and O41 - connector A for the cushion and connector B for the backrest - is received via relays T21 (left) and T22 (right) located in boot fuse box B45, via lines protected by fuses F67 and F68 respectively; the are energized by control signals from switches I65 and I66.Switches I65 and I66 receive a power supply and are also lit up by the ignition-controlled (INT) line protected by fuse F49 of the junction unit under the dashboard B2.