Component description for Electronic Stability Program control unit - GF42.45-P-5119RFH

MODEL 205.012/047/147/212/247 

Shown on model 205.0 

Location 

The Electronic Stability Program control unit is located in the engine compartment, at the left next to the BAS brake booster (A7/7) at the traction system hydraulic unit.

Tasks 

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

• Regenerative braking system
• Electronic Stability Program (ESP®)
• Electronic brake force distribution (EBD)
• Anti-lock braking system (ABS)
• Acceleration skid control (ASR), electronic traction system (ETS)
• Brake Assist System (BAS)
• Brake Assist System PLUS (BAS PLUS) (with CODE 23P (Driving Assistance package Plus))
• Hill Start Assist
• 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
• ESP® trailer stabilization (with CODE 550 (Trailer hitch))
• PRE-SAFE® system (with CODE 23P (Driving Assistance package Plus))
• Standstill control (SSC)
• Steer Assist
• Crosswind Assist
• Tire pressure loss warning (RDW)
• Permanent Speed Limiter (except CODE 23P (Driving Assistance package Plus), except CODE 494 (USA version))
• Variable speed limiter (SPEEDTRONIC) (except CODE 23P (Driving Assistance package Plus))
• Electric parking brake (EFB)

MODEL 205.012/047/147/212/247

with CODE 23P (Driving Assistance package Plus)

On vehicles with CODE 23P (Driving Assistance package Plus), the Variable Speed Limiter and the Permanent Speed Limiter 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 FlexRay (Flex E) 
• Vehicle dynamics CAN (CAN-H) 

Direct line 

The following signals are read in via direct lines:

• Terminal 30
• Terminal 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)
• Status of electric parking brake switch (S76/15)

Chassis FlexRay 

The Electronic Stability Program control unit is a subscriber to chassis FlexRay. The following signals are read in over the chassis FlexRay:

• Signals from instrument cluster (A1) via user interface CAN (CAN HMI) and chassis FlexRay with electronic ignition lock control unit (N73) interface
• Signals from radar sensors control unit
• Status of terminal 15R ON, from electronic ignition lock control unit
• Status of the trunk lid/liftgate lock (A85/5) from the electronic ignition lock control unit, which receives the status from the rear SAM control unit (N10/8) via the interior CAN (CAN B)
• Status of the left front door rotary tumbler switch (A85s1), from the electronic ignition lock control unit which receives the status from the left front door control unit (N69/1) via interior CAN
• Currently engaged gear range from fully integrated transmission control unit (Y3/8n4), drive train operational status, engine running and accelerator pedal position from the CDI control unit (N3/9) (with diesel engine) or ME-SFI [ME] control unit (N3/10) (with gasoline engine) via the drive train CAN and the powertrain control unit (N127)

Vehicle dynamics CAN 

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

• Status of driver belt buckle switch (S68/3) and the vehicle's sprung mass vibrations from the supplemental restraint system control unit (N2/10)

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 FlexRay 

Direct line 

The following components are actuated via direct lines:

• Left electric parking brake actuator motor (M76/1) and right electric parking brake actuator motor (M76/2)

Chassis FlexRay 

• Instrument cluster (display of messages and warnings) via the electronic ignition lock control unit and user interface CAN

Wiring diagram for Adaptive Brake (ABR)

PE42.47-P-2000-97FBA