Spray nozzle hose heater function - GF82.35-P-3009GN

MODEL 166 as of model year 2016 with CODE 874 (MAGIC VISION CONTROL, heated) 

MODEL 292 with CODE 874 (MAGIC VISION CONTROL, heated) 

Function requirements, general 

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

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 the "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).

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:

• Bottom spray nozzle hose heater (R2/4), directly from the SAM control unit
• Top spray nozzle hose heater (R2/5), via left fuse and relay module (K40/6) and windshield washer system junction box (R2/6)

Function sequence for spray nozzle hose heater 

The SAM control unit switches on the spray nozzle hose heater at an outside temperature of T < 3 °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 > 5 °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 can be found in the separate "Energy management" function description.

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