Washer nozzle/washer nozzle hose heater, function

Function requirements, general

 "Engine running" or "drive train operational" signal on

 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 "Drivetrain operational" signal via chassis CAN (CAN E) (up to 31.5.13) or chassis CAN 1 (CAN E1) (as of 1.6.13) to the front SAM control unit with fuse and relay module (N10/1).
The outside temperature is detected by the outside temperature sensor (B14). The front SAM control unit reads in the signal of the outside temperature sensor directly, calculates the actual outside temperature and sends this via interior CAN (CAN B) to the instrument cluster (A1). The instrument cluster calculates the outside temperature to be displayed and sends this via interior CAN to the front SAM control unit.
If the front SAM control unit cannot receive an outside temperature value from the instrument cluster, it calculates the outside temperature itself.

Washer nozzle/washer nozzle hose heater, general

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

Function sequence for washer nozzle/washer nozzle hose heater

The front SAM control unit switches on the spray nozzle heater (R2/1) and the spray nozzle hose heater (R2/11) (with code (875) Heated windshield washer system) with the engine running and an outside temperature of T < 5 °C.

If the outside temperature increases to T > 8 °C, the spray nozzle heater and the spray nozzle hose heater are switched off.