Wiper blade heater, function - GF82.30-P-2004GN

MODEL 166 as of model year 2016 

MODEL 292 

Function requirements, general 

• "Engine running" or "Drive train operational" signal set for t > 3 s.
• Outside temperature T < 5 °C

The CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (N3/10) (with gasoline engine) sends the "Engine running" or "Drive train operational" signal via chassis CAN 1 (CAN E1), electronic ignition lock control unit (N73) and interior CAN (CAN B) to the SAM control unit (N10).

The outside temperature is detected by the outside temperature sensor (B14). The SAM control unit reads in the signals of the outside temperature sensor and uses them to calculate the outside temperature.

Wiper blade heater, general 

The wiper blade heater, consisting of the left wiper blade heater (R2/12) and the right wiper blade heater (R2/13), prevents the washer fluid nozzles in the wiper blade from freezing.

Apart from this, the flexibility of the wiper blades is also retained and the wiper blades are prevented from freezing to the windshield.

Function sequence for wiper blade heater 

If the outside temperature drops below T < 5 °C, the SAM control unit switches on the wiper blade heater via the windshield washer system junction box (R2/6) as follows:

• Between T = +5 °C and -2 °C: The wiper blade heater is actuated for t = 20 s, the break time between the activation cycles is t = 40 s.
• Between T = -2 °C and -9 °C: The wiper blade heater is actuated for t = 30 s, the break time between the activation cycles is t = 30 s.
• Between T = -9 °C and -15 °C: The wiper blade heater is actuated for t = 40 s, the break time between the activation cycles is t = 20 s.
• As of T = -15 °C: The wiper blade heater is actuated continuously, the cycle time is always t = 60 s. In the event of a temperature change, the preceding cycle is always completed.

When the windshield washer system pump (M5/1) is actuated, the wiper blade heater is interrupted.

If the windshield washer system pump is no longer actuated, the wiper blade heater is actuated again after t = 5 s.

The energy management can switch off the wiper blade heater. Detailed information can be found in the separate "Energy management" function description.

Electrical function schematic for wiper blade heater	PE82.30-P-2060-97NBA
Overview of system components for windshield wiper system	GF82.30-P-9996GN