Electrical power steering control unit (ES), component description - GF46.35-P-7010FLM

MODEL 212 as of model year 2014

Top view of steering

Fig 1: Electrical Power Steering Control Unit (ES) Components

Courtesy of MERCEDES-BENZ USA

Location

The electrical power steering control unit is attached to the electric power steering actuator motor.

Task

The electrical power steering control unit has the following tasks:

Reading in of sensors and signals
Evaluation of input factors
Actuation of components
Transmission of requests/information

Reading in of sensors and signals

The input factors are read in via the following connections:

Direct line
Chassis CAN 2 (CAN E2)

Direct line

The following sensor is read in via a direct line:

Electric power steering torque sensor

Chassis CAN 2

The following signals are read in over chassis CAN 2:

Torque request for Steering Assist and wheel speeds, from Electronic Stability Program control unit (N30/4) (except CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG vehicles), except hybrid) or from Premium Electronic Stability Program control unit (N30/7) (with CODE 233 (DISTRONIC PLUS) or with CODE 990 (AMG vehicles), except hybrid) or from regenerative braking system control unit (N30/6) (with hybrid)
Status of "Engine running" signal, "Drivetrain operational" signal and engine speed, from ME-SFI control unit (N3/10) (with gasoline engine) or from CDI control unit (N3/9) (with diesel engine)
Steering angle and steering angle speed, from steering column tube module control unit (N80) detected by steering angle sensor (N49)
Current status and requested toothed rack position of parking system control unit (N62) (with CODE 220 (PARKTRONIC) or with CODE 230 (Exclusive Parking Assist))

Evaluation of input factors

The input factors which are read in are evaluated by the integrated microprocessor, the relevant components are then actuated and requests/information are output.

Actuation of components

The following component is actuated directly:

Electric power steering actuator motor

Transmission of requests/information

The following requests/information are transmitted via chassis CAN 2:

Request to display warning message to instrument cluster (A1)
Steering torque, steering angle speed and status of Steer Assist, to Electronic Stability Program control unit (except CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG vehicles), except hybrid) or to Premium Electronic Stability Program control unit (with CODE 233 (DISTRONIC PLUS) or with CODE 990 (AMG vehicles), except hybrid) or to regenerative braking system control unit (with hybrid)
Current status from electrical power steering control unit
Current toothed rack position

Wiring diagram for electric power steering control unit

PE46.35-P-2101-97DAA