3026168 - E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING - Functional description

Functional description

The heated rear windscreen relay T11, located in the underdashboard control unit B2 , controls the simultaneous activation of the defrosting function for both the heated rear windscreen P55 - line protected by fuse F40 - and the external rear view mirrors P60 and P61 and the defrosting resistors for the rearscreen washer O50 and 051 - line protected by fuse F41. The supply for the coil for relay T11 is 'controlled by the ignition' (INT/A) and is energized by an earth signal coming from the Body Computer M1 - pin 6 of connector F; this signal is sent according to the complex control logic described previously and, in particular, when a signal arrives, via the CAN, coming from the climate control system control unit M70 (heated rear windscreen button pressed or MAX-DEF function on); the feedback signal for lighting up the LED is sent to the control unit M70 via the CAN line. The low outside temperature signal, which switches on the automatic defrosting, detected by a sensor inside the external rear view mirror P60 , also reaches the control unit in the door H44 via the CAN line.