Lower Multifunction Steering Wheel Button Group Electric Controller Unit, Basic Function - GF82.90-P-9892A

WARNING: This page is about a different car, the 2023 Mercedes-Benz GLC300, 2022 Mercedes-Benz GLC300, 2021 Mercedes-Benz GLC300, 2020 Mercedes-Benz GLC350e, and 2020 Mercedes-Benz GLC300. However, it is still accessible from the selected car via links, so may be relevant.

Model all (CAR) with code U88 (AMG steering wheel buttons (AMG DRIVE UNIT))

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.

Task

The lower multifunction steering wheel button group electric controller unit is used to exchange data between the lower multifunction steering wheel button group 1 (S163/3) or the lower multifunction steering wheel button group 2 (S163/4) and the drive program control unit (N145).

The lower multifunction steering wheel button group electric controller unit is connected over the steering wheel CAN (CAN LR) to the vehicle's network architecture.

The electric controller unit for the lower multifunction steering wheel button group is responsible for the following individual tasks:

CAN interface:
Reception of the control data for the lower multifunction steering wheel button groups from the drive program control unit over the steering column tube module control unit (N80) and the steering wheel CAN.
Forwarding of the operation signals of the lower multifunction steering wheel button groups over the steering wheel CAN and the steering column tube module control unit to the drive program control unit.
Direct line (serial peripheral interface):
Reception of operation signals from lower multifunction steering wheel button groups.
Actuation of displays in the lower multifunction steering wheel button groups.

The lower multifunction steering wheel button groups can be used, e.g. to make settings in the following areas: ESP®, suspension, transmission, engine start/stop, exhaust gas flap actuation and drive program.