Spray Nozzle Hose Heater Function - GF82.35-P-3009RD
Model 172.4
with code 875 (Heated windshield washer system)
Function requirements, general
- Engine running or drive train operational
- Outside temperature T < 5°C
The CDI control unit (N3/9) (diesel engine) or the ME-SFI [ME] control unit (N3/10) (gasoline engine) sends the "Engine running" or "Drivetrain operational" signal via chassis CAN 1 (CAN E1) as of 01.03.2016 and via chassis CAN (CAN E) up to 29.02.2016 to the front SAM control unit.
The outside temperature is detected by the outside temperature sensor (B14). The front SAM control unit reads in the data of the outside temperature sensor, calculates the actual outside temperature and transmits this to the instrument cluster (A1) via the interior CAN (CAN B). The instrument cluster calculates the outside temperature to be displayed taking the vehicle speed as well as the heat dissipated from the engine into account and sends it via interior CAN and additionally via chassis CAN 2 as of 01.03.2016 to the front SAM control unit.
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.
Function sequence for spray nozzle hose heater
The front SAM control unit with fuse and relay module (N10/1) switches on the spray nozzle hose heater (R2/11) when the function requirements have been met and the outside temperature is T < 5°C. The front SAM control unit evaluates all relevant data and actuates the spray nozzle hose heater.
If the outside temperature rises to T > 8°C, the spray nozzle hose heater is switched off.
If the front SAM control unit cannot receive an outside temperature value from the instrument cluster, it calculates the outside temperature itself.
| Electrical function schematic for spray nozzle hose heater | Model 172.4 as of model year 2017 with code 875 (Heated windshield washer system) | PE82.35-P-2054-97TAB | |
| Model 172.4 up to model year 2017 with code 875 (Heated windshield washer system) | PE82.35-P-2054-97TAA | ||
| Overview of system components for windshield wiper system | GF82.30-P-9996RD |