Rear/Front Demist (Option)
The rear window demist (9/2) and the front windscreen demist (9/7) are activated by pressing their respective switch on the climate control module (CCM) (4/6). The climate control module (CCM) transmits the data to the central electronic module (CEM) (4/56) via the CAN network.
The central electronic module (CEM) checks to ensure that the defroster start conditions are fulfilled. If so, and the driver activated the switch for heated rear window, the central electronic module (CEM) activates the relay (2/82) located on the rear relay box and the rear window defroster is supplied power via the relay.
If the conditions are met and the driver activates the switch for heated front window, the central electronic module (CEM) activates the relay (2/81A) which powers the heating loop on the passenger side of the windscreen and also activates the relay (2/81B) which powers the heating loop on the driver's side of the windscreen. The relays that power windscreen heating are located in the engine compartment fuse box.
Automatic activation of the rear demist (9/2) can be set in the climate settings in the menu for the Infotainment control module (ICM) (3/281). Rear demist starts in connection with starting the engine and an outdoor temperature below +7 °C.
In order to switch off the function before it is switched off automatically press in the switch again. Automatic switching off of the rear demist is dependent on the outdoor temperature according to:
- Above +7 °C: activated for 12 minutes and then switched off.
- +7 °C to -15 °C: activated constantly for 20 minutes - it then switches to pulsing, 5 minutes activated and 1-10 minutes deactivated. The time it is deactivated is linearly dependent on the temperature.
- Below -15 °C: activated for 20 minutes, then pulsing 5 minutes activated and 1 minute deactivated.
On activation of auto defrost rear in the climate settings the Infotainment control module (ICM) transmits to the central electronic module (CEM) that auto defrost rear has been activated. The central electronic module (CEM) saves the value and responds to the Infotainment control module (ICM) that auto defrost rear is activated, which means the Infotainment control module (ICM) checks the option in the climate settings.
The central electronic module (CEM) also transmits a request via CAN to the climate control module (CCM) to light the LED in the switch.
When the function is switched off, either by pressing the switch on the climate control module (CCM) or that auto defrost rear switches off the function, the LED in the switch on the climate control module (CCM) goes out.