Transfer case actuator motor, component description - GF28.19-P-3202GZ

MODEL 164.1 with CODE (430) Offroad package up to Model Year 8 

MODEL 164.8 with CODE (430) Offroad package up to Model Year 8 

Location 

Fig 1: Identifying Transfer Case Actuator Motor Components

Courtesy of MERCEDES-BENZ USA

The transfer case actuator motor is screwed into the rear housing half of the transfer case on the left in the direction of travel.

Task 

The transfer case actuator motor is actuated by the transfer case control unit (N15/7) via a PWM signal. The transfer case actuator motor actuates either the interaxle differential lock or the "High/Low shift".

PWM stands for P  ulse W  idth M  odulation. The PWM signal is a digital signal with variable pulse widths (pulse durations).

Design 

The transfer case actuator motor is a permanent magnet DC motor with worm gear. Integrated in the transfer case actuator motor are a Hall sensor with direction recognition and an NTC temperature sensor.

NTC stands for N  egative T  emperature C  oefficient, i.e. its electrical resistance decreases as the temperature rises (NTC thermistor).