Heated rear window relay T11, located in the junction unit under the dashboard B2, controls the simultaneous activation of the defrosting function for both the heated rear windscreen P055 - line protected by fuse F40 - and also the defrosting resistances for the windscreen washer O50 and O51 and the exterior rear view mirrors P60 and P61- line protected by fuse F41.The coil for relay T11 receives an ignition-controlled power supply (INT/A) and is energized by an earth signal coming from the Body Computer M1 - pin 6 of connector F; this signal is sent on the basis of a complex control logic illustrated previously and, in particular, when a signal arrives - at pin 32 of connector G of M1 - coming from the rearscreen button pressed (or the MAX-DEF function).On versions with a heater or manual climate control, this signal comes from the climate control system unit H80, to which the feedback signal for turning the relevant LED on is sent - from pin 21 of connector H of M1.On versions with automatic climate control, this signal comes from the climate control system control unit M70 to which the feedback signal for turning the LED on is resent via the CAN line.