GF54.21-P-6051CA Steering Column Tube Module Control Unit, Component Description

GF54.21-P-6051CA Steering Column Tube Module Control Unit, Component Description

Component Identification:

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

Task
The steering column tube module control unit controls the data exchange between the controls on the MFL and the steering column with the corresponding control units that implement the functions.

The steering column tube module control unit has the following tasks:
^ Reading in of sensors, pickups and signals
^ Evaluating input factors
^ Actuation of components

Reading in of sensors, pickups and signals
The input factors are read in with the following connections:
^ Direct inputs
^ Steering LIN (LIN E1)
^ Chassis CAN (CAN E)

Direct inputs
The signals from the following components are read via a direct line:
- Steering angle sensor (N49)
- Combination switch (S4)
Turn signal lamps switch (S4s1)
- Headlamp flasher and high beams switch (S4s2)
- Low beam switch (S4s3)
- Windshield washer system switch (S4s4)
- Wipe switch (S4s5)

- Cruise control lever (S40/4) (with code (440) Cruise control)
- Resume from memory switch (S40/4s1)
- Decelerate and set switch (S40/4s2)
- Accelerate and set switch (S40/4s3)
- OFF switch (S40/4s4)
- Indicator switch (S40/4s5)
- SPEEDTRONIC switch (S40/4s6) (without code (494) USA version and without code (498) Japan version)
- DISTRONIC control (S40/4r1) (with code (233) DISTRONIC PLUS)

- Steering column adjustment switch (S59)

Steering LIN
The signals for the following components are read in over the steering LIN:
- Left multifunction steering wheel button group (S110)
- Downshift steering wheel gearshift button (S110/1) (with transmission 722)
- Left fanfare horn system button (S110s5)

- Right multifunction steering wheel button group (S111)
- Upshift steering wheel gearshift button (S111/1) (with transmission 722)
- Right fanfare horn system button (S111s5)

Chassis CAN
The signals are imported by the steering column tube module control unit via the chassis CAN.
The functions resulting therefrom are described in the corresponding 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 affected components are then actuated.

Actuation of components
Components are actuated with the following lines:
^ Direct line
^ Steering LIN

Direct line
The following components are actuated via a direct line:
- Driver airbag squib 1 (R12/13)
- Driver airbag squib 2 (R12/14)

Steering LIN
The following component is actuated via steering LIN:
- Symbol illumination of the multifunction steering wheel button groups