Electrical Power Steering Control Unit (ES), Component Description - GF46.35-P-7010RF

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Model 205, 253

Top view of steering

Fig 1: Electrical Power Steering Control Unit Components Location - Model 205

Courtesy of MERCEDES-BENZ USA

Location

The electrical power steering control unit is mounted onto the steering gear.

Tasks

The electrical power steering control unit has the following tasks:

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

Reading in of signals

The input factors are read in via the following connections:

Direct line
Suspension FlexRay (Flex E)
Vehicle dynamics CAN (CAN H)

Direct line

The signals from the electric power steering torque sensor are read in over a direct line.

Chassis FlexRay

The following signals, among others, are read in via chassis FlexRay:

Steer Assist torque request and wheel speeds
Vehicle speed
Engine speed (except model 253.99)
"Drivetrain operational" signal
Steering wheel angle and steering angle rate of change
Requested toothed rack position

Vehicle dynamics CAN

The electrical power steering control unit also reads in the following signals from the Supplemental Restraint System control unit (N2/10) over the vehicle dynamics CAN:

Vehicle turn rate
Lateral acceleration
Longitudinal acceleration

Evaluation of input factors

The read in input factors are evaluated by the integrated microprocessor and the corresponding component parts are actuated and the requests or information issued.

Actuation of components

The electric power steering actuator motor is actuated over a direct line.

Transmission of requests/information

The following requests/information are also sent over the suspension FlexRay:

Request to display warning message to instrument cluster (A1)
Steering torque, steering angle rate of change and status of steering assistance to the Electronic Stability Program control unit (N30/4)
Current status from electrical power steering control unit

	Wiring diagram for electric power steering control unit	Model 205 up to model year 2019 Model 253 (except 253.99)	PE46.35-P-2101-97FBA
		Model 205 as of model year 2019	PE46.35-P-2101-97FBB