Component Description For Steering Column Tube Module Control Unit - GF54.21-P-6051FHG

Model 238

as of Model Year 2019 Up To Model Year 2021

Fig 1: Steering Column Tube Module Control Unit Components Location - Model 238 As Of Model Year 2019 Up To Model Year 2021

Courtesy of MERCEDES-BENZ USA

Location

The steering column tube module control unit is located directly behind the multifunction steering wheel (MFL) on the steering column tube of the steering column.

Tasks

The steering column tube module control unit has the following tasks:

Reading in of sensors and signals
Evaluation of input factors
Actuation of components
Sending signals

Reading in of sensors and signals

The input factors are read in via the following connections:

Direct line
Steering wheel CAN (CAN LR)
Suspension FlexRay (Flex E)

Direct line

The signals from the following components are read via a direct line:

Steering wheel angle sensor (N49)
Combination switch (S4)
DIRECT SELECT lever (S16/13) (transmission 725)
Steering column adjustment switch (S59) (with code 275 (Memory package) and except CODE 443 (Steering wheel heater))
Steering column adjustment and steering wheel heater switch (S59/1) (with CODE 443 (Steering wheel heater))

Steering wheel CAN

The steering wheel electronics (N135) directly read in the signals of the following components and transmit these via the steering wheel CAN to the steering column tube module control unit:

Heating element temperature sensor (R22/4b1) (with CODE 443 (Steering wheel heater))
Instrument cluster multifunction steering wheel button group (S163/1)
Head unit multifunction steering wheel button group (S163/2)
Steering wheel downshift button (S110/1) (transmission 725)
Steering wheel upshift button (S111/1) (transmission 725)

Chassis FlexRay

The steering column tube module control unit reads in, for example, the following signals via the chassis FlexRay:

Circuit status
Engine running status
Interior temperature
Request for steering wheel heater (with code 443 (Steering wheel heater))
Status of switch and controls illumination
Displayed outside temperature

Evaluation of input factors

The input factors that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.

Actuation of components

Components are actuated with the following lines:

Steering wheel CAN
Direct line

Steering wheel CAN

The steering wheel electronics directly actuate the following components; it receives the signals for this purpose via the steering wheel CAN from the steering column tube module control unit:

Multifunction steering wheel button groups (symbol illumination)
Steering wheel heater heating element (R22/4r1) (with CODE 443 (Steering wheel heater))

Direct line

The following components are actuated directly via a looped line by the supplemental restraint system control unit (N210):

Driver airbag squib 1 (R12/13)
Driver airbag squib 2 (R12/14)

Sending signals

The steering column tube module control unit sends, for example, the following signals via the chassis FlexRay:

Status of steering wheel angle sensor
Steering wheel angle, steering wheel velocity
Multifunction steering wheel button group status
Combination switch, status
Status of steering wheel gearshift buttons (transmission 725)
Status of DIRECT SELECT lever (transmission 725)
Steering column adjustment switch (S59) (with code 275 (Memory package) and except CODE 443 (Steering wheel heater))
Steering column adjustment and steering wheel heater switch (S59/1) (with CODE 443 (Steering wheel heater))
Status of steering wheel heater (with CODE 443 (Steering wheel heater))

Wiring diagram for steering column module control unit

PE46.10-P-2101-97DCA