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

Model 166 

as of model year 2016 

with code 874 (MAGIC VISION CONTROL incl. heated windshield washer system) 

Model 166 

as of model year 2016 

with code 875 (Heated windscreen washer system) 

Model 292 

with code 874 (MAGIC VISION CONTROL incl. heated windshield washer system) 

Model 292 

with code 875 (Heated windscreen washer system) 

Function requirements, general 

• "Engine running" or "Drivetrain operational" signal set for t > 3 s

On model 166.063, the ME-SFI [ME] control unit (N3/10) sends the "Engine running" or "Drivetrain operational" signal via the engine CAN (CAN C1), powertrain control unit (N127), chassis CAN 1 (CAN E1), electronic ignition lock control unit (N73) and interior CAN (CAN B) to the SAM control unit (N10).

On all other models, the CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (with gasoline engine) sends the "Engine running" or "Drivetrain operational" signal via the chassis CAN 1, electronic ignition lock control unit and interior CAN to the SAM control unit.

Spray nozzle hose heater, general 

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

To do so, the following components are heated:

• Upper spray nozzle hose heater (R2/5), via spray nozzle hose heater relay (K129) and windshield washer system junction box (R2/6) (with code 874 (MAGIC VISION CONTROL, heated))
• Spray nozzle hose heater (R2/11), direct from SAM control unit (with code 875 (Windshield washer system, heated) or with code 874 (MAGIC VISION CONTROL, heated))

Function sequence for spray nozzle hose heater 

The SAM control unit switches on the spray nozzle hose heater when the function requirements have been met and at an outside temperature of T < 5°C.

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.

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-2054-97NBA
	Overview of system components for windshield wiper system		GF82.30-P-9996GN