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Home >> Mercedes Benz >> 2019 >> S450 Base >> Repair and Diagnosis >> Body & Frame >> Mirrors >> Interior Equipment - 222 Chassis >> Basic Knowledge >> Armrest Heating Control Unit, Basic Function - GF68.20-P-9890A

Armrest Heating Control Unit, Basic Function - GF68.20-P-9890A

Model All (CAR) with code 906 (Front armrest heater) 

Model All (CAR) with code 907 (Rear armrest heater) 

Overview 

This document contains information on:

General 

The armrest heating control unit regulates the functions of the center console armrest heating.

Function requirement 

Function 

The armrest heating function can be used to heat the center console armrests. Additionally, depending on the model, the requests for operating the heating function are transmitted by the rear SAM control unit via the LIN unit and sent accordingly to the heating elements of the armrests. The temperature and function are monitored constantly through evaluation of the signals of the temperature sensors on the armrest heating elements.

  Function schematics     
  Electrical function schematic for armrest heater Model 238 up to model year 2021 with code 906 (Front armrest heater) PE68.20-P-2055-97DCA 
    Model 257, 290 up to model year 2021 with code 906 (Front armrest heater) PE68.20-P-2055-97XBA 
  Component description     
  Armrest heater control unit, component description Model 223 with code 906 (Front armrest heater)
Model 223 with code 907 (Rear armrest heater)
GF68.20-P-2001A