The power supply to both seat heaters O40 and O41 is received via relays T31 (left) and T35 (right) located in boot fuse box B45, via lines protected by fuses F68 and F83 respectively. The relays are excited by control signals from switches I65 and I66.Switches I65 and I66 are supplied by an ignition-operated line (INT) leading from Body Computer M1 - pin 6 of connector E - protected by fuse F61 of M1.Body Computer M1 - connector G - is supplied directly by the battery via a line protected by maxifuse F2 of engine compartment control unit B1; it is supplied with an ignition-operated supply (INT) at pin 32 of connector D; pin 10 of connector H of M1 supplies the Body Computer with a reference earth.The switches are lit by an ignition-operated supply (INT) from the line of fuse F61 of M1.