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

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MODEL 166 as of model year 2016

MODEL 292

Shows model 166.0

Fig 1: Steering Column Tube Module Control Unit Component Location - Model 166 As Of Model Year 2016

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 signals
Evaluation of input factors
Actuation of components
Sending signals

Reading in of signals

The input factors are read in over the following connections:

Direct line
Steering LIN (LIN E1)
Chassis CAN 1 (CAN E1)

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)
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)
- SPEEDTRONIC switch (S40/4s6) (without CODE 494 (USA version))
- DISTRONIC control (S40/4r1) (with code 239 (DISTRONIC PLUS) or with code 266 (DISTRONIC PLUS with Steer Assist and Stop & Go Pilot))
Steering column adjustment switch (S59) (with CODE 275 (Memory package))

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:

Left multifunction steering wheel button group (S110)
Steering wheel downshift button (S110/1)
Right multifunction steering wheel button group (S111)
Steering wheel upshift button (S111/1)

Chassis CAN 1

The steering column tube module control unit reads in the following signals, among other things, via chassis CAN 1:

Circuit 15 status
Circuit 58d status (switch and controls illumination)
Request to actuate steering wheel vibration motor (M99)

The functions that use these signals are described in the individual function descriptions (see appropriate 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 line:

Steering LIN
Direct line

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 238 (Active Lane Keeping Assist))

Direct line

The following component is actuated via a direct line:

SPEEDTRONIC light-emitting diode (S40/4v1) (not with CODE 494 (USA version))

The following components are actuated directly via looped lines 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 the following signals, among other things, via chassis CAN 1:

Steering wheel angle, steering wheel velocity
Multifunction steering wheel button group status
Combination switch, status
Steering wheel gearshift button status
DIRECT SELECT lever status
CRUISE CONTROL lever
Steering column adjustment switch status (with CODE 275 (Memory package))

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