The heated rear windscreen relay T32, located in the engine compartment junction unit B1, controls the engagement of the heated rear windscreen P55 defrosting resistances via the line protected by fuse F69 of junction unit B1.The coil of relay T32 is supplied via an ignition-controlled supply from relay T5 of B1: the supply, ignition-controlled except during start-up (INT/A) is controlled by pin 13 of connector A of M1. Relay T32 is excited by an earth signal from Body Computer M1 - pin 46 of connector A. This signal is sent on the basis of the strategy described previously and in the presence of a heated rear window control from pin 10 of the switch in unit H80 to pin 20 of connector A of M1 in specifications with MANUAL CLIMATE CONTROL or via the CAN network from the control unit of climate control system M70 at pins 39 and 54 of connector A of M1 - in specifications with an AUTOMATIC AIR CONDITIONER.when the demister is on, Body Computer M1 - pin 12 of connector M1 - sends a positive signal to turn on the led located near the pushbutton in the climate control unit.Activation of door mirror demister coils P60 and P61 is similarly controlled via heated rear window relay T32 and a line protected by fuse F70 of control unit B1.