Lower Multifunction Steering Wheel Button Group Electric Controller Unit, Component Description - GF82.90-P-4007RR

Model 190 as of 12/1/18

as of model year 2019

With Code U88 (AMG steering wheel buttons (AMG DRIVE UNIT))

Fig 1: Lower Multifunction Steering Wheel Button Group Electric Controller Unit Components Location - Model 190 As Of 12/1/18 With Code U88

Courtesy of MERCEDES-BENZ USA

Location

The lower multifunction steering wheel button group electric controller unit is located at the bottom of the multifunction steering wheel.

Tasks

The lower multifunction steering wheel button group electric controller unit has the following tasks:

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:

Lower multifunction steering wheel button group 1 (operation signals)
Lower multifunction steering wheel button group 2 (operation signals)

Steering wheel CAN

The lower multifunction steering wheel button group electric controller unit receives the signals over the steering wheel CAN from the steering column tube module control unit (N80).

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 lower multifunction steering wheel button group electric controller unit actuates the displays in the lower multifunction steering wheel button group.