Rear Demist

Fig 1: Identifying Rear Demist

Courtesy of VOLVO CARS OF NORTH AMERICA.

Rear demist (9/2) is activated by pressing the switch on the climate control module (CCM) (3/112). The climate control module (CCM) transmits the data via the Control area network (CAN) to the central electronic module (CEM) (4/56).

The central electronic module (CEM) checks that the conditions to start the demist have been met. If the conditions are met the central electronic module (CEM) activates the relay (2/82) and the heating is supplied with power via the relay.

The central electronic module (CEM) also transmits a request via the Control area network (CAN) back to the climate control module (CCM) to light the LED in the switch.