Steering Wheel Electronics Control Unit, Component Description - GF82.90-P-4006LFM

Model 217, 222

as of model year 2018

Shown on model 222, steering wheel removed

Fig 1: Steering Wheel Electronics Control Unit Components Location - Model 222 As Of Model Year 2018

Courtesy of MERCEDES-BENZ USA

Location

The steering wheel electronics are located directly behind the multifunction steering wheel (MFL) on the steering column tube of the steering column.

Tasks

The steering wheel electronics do the following:

Reading in of sensors and signals
Evaluation of input factors
Actuation of components

Reading in of sensors and signals

The input factors are read in via the following connections:

Direct line
Steering wheel CAN (CAN LR)

Direct line

The signals from the following components are read via a direct line:

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)
Horn contact plate (S4/2)

Steering wheel CAN

The steering wheel electronics receive the signals for actuation of the following components 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))

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

The following components are actuated via a direct line:

Multifunction steering wheel button groups (symbol illumination)
Steering wheel vibration motor (up to 31.05.2018 with code 243 (Active Lane Keeping Assist) or code 23P (Driving Assistance Package))
Steering wheel heater heating element (in code 443 (Steering wheel heater))

Wiring diagram for steering column module control unit

PE46.10-P-2101-97SEB