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

Model 217, 222

as of Model year 2018

Shown on Model 222.0, steering wheel removed

Fig 1: Steering Column Tube Module Control Unit Components Location - Model 222 As Of Model Year 2018 (Shown On Model 222.0)

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)
Steering column adjustment switch (S59) (without 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)
Steering wheel upshift button (S111/1)

Chassis FlexRay

The signal is read in from the steering column tube module control unit via the suspension FlexRay.

The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).

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 vibration motor (M99) (up to 31.05.2018 with code 243 (Active Lane Keeping Assist) or code 23P (Driving Assistance Package))
Steering wheel heater heating element (R22/4r1) (with CODE 443 (Steering wheel heater))

Direct line

The following component is actuated via a direct line:

Steering wheel heater indicator lamp (S59/1e1) (with CODE 443 (Steering wheel heater))

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

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

Sending signals

The steering column tube module control unit sends signals via the following connection:

Chassis FlexRay

Chassis FlexRay

The signals are sent by the steering column tube module control unit via the suspension FlexRay.

The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).

Wiring diagram for steering column module control unit

PE46.10-P-2101-97SEA