Spray Nozzle Hose Heater Function - GF82.35-P-3009RF

Model 205, 253 

with code 875 (Heated windsshield washer system) 

Function requirements, general 

• Engine running or drivetrain operational for t > 3 s
• Outside temperature T < 5°C

The "Engine running" or "Drive train operational" signal is sent by the CDI control unit (N3/9) (Diesel engine) or the ME-SFI [ME] control unit (N3/10) (gasoline engine) via drive train CAN (CAN C1), powertrain control unit (N127), chassis FlexRay (Flex E), electronic ignition lock control unit (N73) and the interior CAN (CAN B) to the front SAM control unit (N10/6).

In Model 253.99, the powertrain control unit transmits the appropriate signal via the suspension FlexRay, the electronic ignition lock control unit and the interior CAN to the front SAM control unit.

The outside temperature is detected by the outside temperature sensor (B14). The front SAM control unit directly reads in the signals of the outside temperature sensor and calculates the outside

temperature.

Spray nozzle hose heater, general 

The spray nozzle hose heater prevents the washer fluid in the spray nozzles and in the spray nozzle hose from freezing.

To do so, the front SAM control unit actuates the spray nozzle hose heater (R2/11) directly.

Function sequence for spray nozzle hose heater 

The front SAM control unit switches on the spray nozzle hose heater at an outside temperature of T < 5°C.

If the outside temperature rises to T > 8°C, the spray nozzle hose heater is switched off.

When the windshield washer system pump (M5/1) is actuated, the spray nozzle hose heater is interrupted. When the windshield washer system pump is no longer actuated, the spray nozzle hose heater is actuated again after t = 5 s.

The energy management can switch off the spray nozzle hose heater. Detailed information is available in a separate document.

	Electrical function schematic for spray nozzle hose heater		PE82.35-P-2054-97FBA
	Overview of system components for windshield wiper system		GF82.30-P-9996RF