3315603 - E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING - Functional description (Right hand drive)

Functional description

The heated rear window relay J55 controls the simultaneous switching on of the demisting function of the rear window P55 , the heated windscreen P56 and the external rearview mirrors P60 and P61 .(The control circuit of the heated rear window P55 passes through the power source/amplifier aerial P25 -  See E3510  RADIO ) The supply line to the latter is also protected by the mirror demister fuse B16 . The relay J55 is supplied by the direct line from the battery through the fuse B33 . An earth signal from the electronic Check device M45 - pin 10 of connector C - energizes the coil of relay J55 , so supply is sent to the resistors of P55 , P56 , P60 and P61 : this signal is enabled and suitably time-lagged by the device M45 . The ignition-operated supply (INT/A) of the Check device M45 reaches through fuse F1 of junction unit B1 to pin 9 of connector C: pin 7 of connector C is earthed. The device M45 gives enablement to the time-lagged switching on of the rear window when it receives the command from the on/off button - pin 11 of connector A - and at the same time the engine rpm signal is present - pin 8 of connector B, coming from the instrument panel E50 : enablement takes place if the engine speed is above 1000 rpm. The button which switches on the heated rear window function is in the climate control panel H80 : the command is sent to the climate control unit M70 - pin 13 of connector C - from pin 9 through the serial line. The control unit M70 is supplied - to pin 11 of connector B - from the ignition-controlled line (INT/A) of relay R1 protected by fuse F9 of junction unit B1 : pin 8 of connector C is earthed. From pin 9 of connector B of M70 , the command is sent to the Check device M45 - pin 11 of connector A. With the function switches on, the Check device M45 sends a signal, from pin 2 of connector B, to light up the LED which signals the engagement of the function: the signal reaches pin 11 of connector C of M70 and from there the controls H80 .