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

Model All (Light transporter) 

Courtesy of MERCEDES-BENZ USA

Example illustration of electrical power steering control unit 

Overview 

This document contains information on:

• General 
• Function 

General 

The electrical power steering control unit (5) is the central control unit for the steering functions.

Function 

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

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

In order to carry out these functions, the electrical power steering control unit (5) primarily processes the following input factors:

• 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

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

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

The electrical power steering control unit (5) is attached to the rack-and-pinion steering together with the electric power steering actuator motor (6).

The electrical power steering control unit (5) must be re-adjusted after replacement (e.g. after an accident repair).

Depending on the vehicle involved, the hand detection function must also be calibrated on the steering wheel ("hands on/off detection").

	Component descriptions
	Electric power steering control unit, component description	Model 420	GF46.35-S-7012VRA
		Model 447 with code XM7 (MOPF II)	GF46.35-S-7012A