Electric Power Steering Control Unit, Basic Function - GF46.35-P-9890A

Model All (CAR) 

Example illustration of electrical power steering control unit 

Courtesy of MERCEDES-BENZ USA

Example illustration of electrical power steering control unit 

Overview 

This document contains information on:

• General 
• Function 
  • Evaluation of input signals 
  • Output of signals 
  • Function extensions 

General 

The electric power steering control unit (3, 5) is the central control unit for the steering functions. It is attached at the rack-and-pinion steering together with the electric power steering actuator motor (2, 6).

Function 

The electrical power steering control unit (3, 5) engages in the following functions:

• Electronic Stability Program (ESP®)
• Active Park Assist

Evaluation of input signals 

The electrical power steering control unit (3, 5) primarily processes the following input signals:

• Steer Assist torque request and wheel speeds
• Engine status, drivetrain operational and engine speed
• Steering wheel angle and steering wheel velocity
• Current status and requested toothed rack position of parking system control unit

Output of signals 

The electric power steering control unit (3, 5) processes these input factors and primarily transmits the following actuations:

• Warning message in driver display
• Steering torque, steering wheel velocity and steer assist status to the ESP® control unit
• Electrical power steering control unit, status
• Toothed rack position

Function extensions 

Vehicles with conditionally automated parking or conditionally automated driving SAE level 3

To retain the electric steering function if the main on-board electrical system fails, the electrical power steering control unit (3, 5) is also connected to the secondary on-board electrical system via circuit 30.

In addition to connection via the secondary on-board electrical system, the electrical power steering control unit (3, 5) can, in the event of a fault, still communicate with the control units required for the steering function via a redundant signal path.

	Component descriptions
	Electric power steering control unit, component description	Model 223	GF46.35-P-7012A
		Model 243	GF46.35-P-7012B
		Model 206	GF46.35-P-7012C
		Model 297	GF46.35-P-7012D
		Model 295	GF46.35-P-7012E
		Model 232	GF46.35-P-7012F
		Model 238 up to model year 2021	GF46.35-P-7012FH
		Model 296	GF46.35-P-7012G
		Model 254	GF46.35-P-7012H
		Model 118 as of model year 2023 Model 177, 247 as of model year 2022	GF46.35-P-7012L
		Model 167 as of model year 2023	GF46.35-P-7012M
		Model 192	GF46.35-P-7012R