Electronic Stability Program Control Unit, Basic Function - GF42.45-D-9890A

Model All (Light transporter) 

Courtesy of MERCEDES-BENZ USA

Example illustration of Electronic Stability Program control unit 

Overview 

This document contains information on:

• General information 
• Function 

General information 

The ESP® control unit (1) control unit processes the information required for the Electronic Stability Program (ESP®). The ESP® control unit (1) has the following tasks:

• Reading in of input signals
• Evaluation of input signals
• Actuation of component parts

The input signals are read in via direct lines and bus lines.

Direct lines are, e.g.:

• Terminal 30
• Terminal 31
• Traction system hydraulic unit
• Pedal angle sensor
• Dual brake vacuum sensor
• Left/right front axle rotational speed sensor
• Left/right rear axle rotational speed sensor
• Brake vacuum pump relay

The ESP® control unit (1) is a bus system user. It communicates with the following control units:

• Instrument cluster
• Supplemental restraint system (SRS) control unit
• Combustion engine control unit
• SAM (signal acquisition and actuation module) control unit
• Electric power steering control unit
• Left/right front door control unit
• Electronic ignition lock control unit
• Steering column tube module control unit
• Drivetrain control unit

The read-in input signals are evaluated by the integrated microprocessor and the affected component parts are then actuated.

The ESP® control unit (1) is located in the engine compartment, next to the brake booster on the traction system hydraulic unit.

Function 

In essence, the ESP® control unit (1) contains the control for the following systems:

• Regenerative brake system
• Electric parking brake
• Radar-based regenerative brake system
• Electronic Stability Program (ESP®)
• Electronic brake force distribution
• Anti-lock braking system
• Anti-slip control, electronic traction system
• Brake Assist
• Hill Start Assist
• Flashing adaptive brake lights (except USA version)
• Dry braking
• Brake system precharging, depending on accelerator pedal actuation.
• Brake system precharging depending on lateral acceleration.
• HOLD function
• ESP® trailer stabilization
• PRE-SAFE® system
• Standstill control
• Steer Assist
• Crosswind Assist
• Tire pressure loss warning, tire pressure monitoring system (depending on model, the tire pressure monitoring function is integrated in the SAM control unit, e.g. on model 420)
• Limiter
• Cruise control

The ESP® control unit (1) processes these input signals and also initiates the following actuations:

• Supplemental restraint system (SRS) control unit
• Electrical ignition lock control unit
• Drivetrain control unit
• Brake pedal signal
• Electric parking brake actuator motor, left/right

	Component part descriptions
	Component description for Electronic Stability Program control unit	Model 907 with code M1E (Electric vehicle)	GF42.45-D-5119A