The wiper blade heater prevents the washer fluid nozzles in the wiper blades from freezing and it prevents the wiper rubber sticking to the windshield.
Their flexibility is retained by heating up the wiper blades all over.
Function requirement
Engine running or drive train operational
Heat wiper blade
From an outside temperature below 5 °C, the wiper blade heater is activated and actuated cyclically up to -15 °C. The cycle time here is always 60 s. If the outside temperature falls below -15 °C, the wiper blades are permanently heated.
If the temperature changes, the preceding cycle is always run through to the end.
Outside temperature
Actuation
Pause
5... -2 °C
20 s
40 s
-2...-9 °C
30 s
30 s
-9...-15 °C
40 s
20 s
<-15 °C
60 s
0 s
Actuation of the wiper blade heater is interrupted if the washer fluid pump is actuated. The wiper blade heater is actuated again 5 s after switching off the washer fluid pump.
Function schematics
Function schematic, heat wiper blade
Model 167 with code 874 (MAGIC VISION CONTROL, heated)