Component Description For Electronic Stability Program Control Unit - GF42.45-P-5119GRH

MODEL 166.063 as of model year 2016 

View from front 

Fig 1: Electronic Stability Program Control Unit Component Location - Model 166.063 As Of Model Year 2016

Courtesy of MERCEDES-BENZ USA

Location 

The Electronic Stability Program control unit is located in the engine compartment, at the left next to the BAS brake booster at the traction system hydraulic unit.

Tasks 

The Electronic Stability Program control unit contains the control for the following systems:

• Regenerative braking system (RBS)
• Radar-based regenerative braking system
• Electronic Stability Program (ESP®)
• Electronic brake force distribution (EBD)
• Torque Vectoring Brake
• Anti-lock braking system (ABS)
• Acceleration skid control (ASR), electronic traction system (ETS)
• Brake Assist System (BAS)
• Brake Assist System PLUS (BAS PLUS)
• Adaptive brake lights, flashing (except with CODE 494 (USA version))
• Dry braking
• Precharging, depending on accelerator pedal actuation
• Precharging, depending on lateral acceleration
• HOLD function
• Hill Start Assist
• Speed control during downhill driving
• ESP® trailer stabilization (with CODE 550 (Trailer hitch))
• PRE-SAFE® system (with CODE 23P (Driving assistance package))
• Standstill control (SSC)
• Steer Assist
• Crosswind Assist
• Tire pressure loss warning (RDW) (with code 477 (Tire pressure loss warning))

On vehicles with CODE 23P (Driving assistance package), the limiter and the cruise control are integrated in the radar sensors control unit (N62/1).

The Electronic Stability Program control unit has the following tasks:

• Reading in of signals 
• Evaluation of input factors 
• Actuation of components 

Reading in of signals 

The input factors are read in via the following connections:

• Direct line 
• Chassis CAN 1 (CAN E1) 
• Vehicle dynamics CAN (CAN-H) 

Direct line 

The following signals are read in via direct lines:

• Terminal 30
• Circuit 31
• Pedal angle sensor (B37/1)
• Brake vacuum sensor (B64/1)
• Left front axle rpm sensor (L6/1)
• Right front axle rpm sensor (L6/2)
• Left rear axle rpm sensor (L6/3)
• Right rear axle rpm sensor (L6/4)
• BAS membrane travel sensor (A7/7b1)
• Brake pressure simulator valve pressure sensor (B18/5)

Chassis CAN 1 

The Electronic Stability Program control unit is a participant of the chassis CAN 1. The following signals are read in over chassis CAN 1:

• Signals from instrument cluster (A1) over the chassis CAN 2 (CAN E2) and chassis CAN 1 using electronic ignition lock control unit interface (N73)
• Signals from radar sensors control unit
• Status of terminal 15R ON, from electronic ignition lock control unit
• Status of left front door safety catch microswitch (A85s1) or right front door safety catch microswitch (A85/1s1), from the electronic ignition lock control unit, which receives the status of the left front door control unit (N69/1) or the right front door control unit (N69/2) over the interior CAN (CAN B)
• Currently engaged gear range from fully integrated transmission control unit (Y3/8n4), status of drive train operational, engine running and accelerator pedal position from the ME-SFI [ME] control unit (N3/10) over the engine CAN (CAN C1) and the powertrain control unit (N127)
• Status of driver seat belt buckle restraint system switch (S68/3), from the supplemental restraint system control unit (N2/10)

Vehicle dynamics CAN 

Signals are read in over the chassis CAN from the following components:

• Sprung mass vibrations of vehicle from yaw rate sensor for lateral and longitudinal acceleration (B24/15)

Evaluation of input factors 

The input factors that have been read in are evaluated by the integrated microprocessor and the affected components are then actuated.

Actuation of components 

Components are actuated with the following line:

• Direct line 
• Chassis CAN 1 

Direct line 

The following components are actuated via direct lines:

• Traction system hydraulic unit (A7/3)
• BAS solenoid valve (A7/7y1)
• Brake pressure simulator valve (Y113)

Chassis CAN 1 

The following components are actuated via the chassis CAN 1:

• Instrument cluster (output of messages and warnings) over the electronic ignition lock control unit and chassis CAN 2