Steering column module control unit, component description - GF54.21-P-6051CW

MODEL 204.0/2 up to Model Year 2008 

Illustrated on model 204.0 

Location 

The steering column module control unit is located on the steering column.

General 

The steering column module control unit is to the chassis CAN and to the steering LIN for data exchange.

Communication takes place between the multifunction steering wheel and the steering column module control unit via the steering LIN.

Looping through of signals 

The steering column module control unit is connected directly with the fanfare horns and airbag clock spring contact. The following components are connected to the steering column module control unit, however are not actuated, but are only looped through.

• From the supplemental restraint system control unit (N2/10) to the
  • Driver airbag squib 1 (R12/13) and to the
  • Driver airbag squib 2 (R12/14).

Discrete inputs 

• Circuit 30
• Circuit 31
• Combination switch (S4)
  • Turn signal lamps switch (S4s1)
  • Headlamp flasher/high beam switch (S4s2)
  • Low beam switch (S4s3)
  • Windshield washer system switch (S4s4)
  • Wipe switch (S4s5)
• Steering column adjustment switch (S59) (with code (275) Memory package (driver seat, steering column, mirrors))

On vehicles with code (428) steering wheel shift buttons the following components are read in via the steering LIN, on vehicles without code (428) steering wheel shift buttons the following component are read in voltage-coded.

• Left multifunction steering wheel button group (S110)
• Steering wheel downshift button (S110/1) (with code (428) steering wheel shift buttons)
• Group of buttons on right of multifunction steering wheel (S111)
• Steering wheel upshift button (S111/1) (with code (428) steering wheel shift buttons)
• 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) (not and not )

The steering column module control unit takes over the actuation of:

• Switch and controls illumination (circuit 58d) of components connected
• SPEEDTRONIC light emitting diode (S40/4v1) (not and not )