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

Model 238

Up To Model Year 2019

Shown On Model 238.3, steering wheel removed

Fig 1: Steering Column Tube Module Control Unit Components Location - Model 238 Up To Model Year 2019 (Shown On Model 238.3)

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 LIN (LIN E1)
Suspension FlexRay (Flex E)

Direct line

The signals from the following components are read via direct lines:

Steering wheel angle sensor (N49)
Combination switch (S4)
DIRECT SELECT lever (S16/13) (transmission 725)
Cruise control lever (S40/4)
- Resume from memory switch (S40/4s1)
- Decelerate and set switch (S40/4s2)
- Accelerate and set switch (S40/4s3)
- OFF switch (S40/4s4)
- Variable speed limiter switch (S40/4s6) (except code 494 (USA version))
- DISTRONIC control (S40/4r1) (with code 239 (DISTRONIC distance pilot) or code 23P (Driving assistance package))
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 LIN

The steering wheel electronics (N135) directly reads in the signals for the following components and sends them over the steering LIN to the steering column tube module control unit:

Instrument cluster multifunction steering wheel button group (S163/1)
Steering wheel downshift button (S110/1) (transmission 725)
Head unit multifunction steering wheel button group (S163/2)
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:

Terminal status of terminal 15
Status of circuit 58d (switch and controls illumination)
Request to actuate steering wheel vibration motor (M99) (with code 22P (Lane package))

Actuation of components

Components are actuated with the following line:

Direct line
Steering LIN

Direct line

The following component is actuated via a direct line:

Variable speed limiter LED (S40/4v1) (except code 494 (USA version))

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

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

Steering LIN

The steering wheel electronics actuates the following components directly. The signals for this are received via the steering LIN from the steering column tube module control unit:

Multifunction steering wheel button groups (symbol illumination)
Steering wheel vibration motor (with code 22P (Lane package))

Sending signals

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

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)
CRUISE CONTROL lever
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))

Wiring diagram for steering column module control unit

PE46.10-P-2101-97DCA