Component Description For Electronic Stability Program Control Unit - GF42.45-P-5119RFH
Model 205.012/013/047/053/054/147/212/213/247/253, 253.353/354/953/954/99
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 controls the following functions:
- Electronic Stability Program (ESP®)
- Electronic brake force distribution (EBD)
- Anti-lock braking system (ABS)
- Acceleration skid control (ASR), electronic traction system
- Brake Assist System (BAS)
- Brake Assist System PLUS (BAS PLUS) (with code 23P (Driving package))
- Hill Start Assist
- Flashing adaptive brake lights
- 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 package))
- Standstill control (SSC)
- Steer Assist
- Crosswind Assist
- Tire pressure loss warning system (RDM) (except code 475 (Tire pressure monitor (TPM)))
- Permanent Speed Limiter (except code 23P (Drive package) and except code 494 (USA version))
- Variable speed limiter (SPEEDTRONIC) (except code 23P (Drive package))
- Electric parking brake (EFB)
The variable speed limiter and permanent speed limit functions are integrated into 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
- Suspension FlexRay (Flex E)
- Vehicle dynamics CAN (CAN H)
Direct line
The Electronic Stability Program control unit reads in the signals from the following components over direct lines:
- 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 suspension FlexRay user.
The following signals, for example, are read in via chassis FlexRay:
- Signals from instrument cluster (A1)
- Signals from radar sensors control unit (with code 23P (Drive package))
- Status of circuit 15 from electronic ignition lock control unit (N73)
- Status of trunk lid/liftgate lock (A85/5) from rear SAM control unit (N10/8)
- Status of left front door rotary tumbler switch (A85s1) from left front door control unit (N69/1)
- Engaged gear range from fully integrated transmission control unit (Y3/8n4)
- Drivetrain operational, engine running and accelerator pedal position from ME-SFI [ME] control unit (N3/10) (gasoline engine) or CDI control unit (N3/9) (diesel engine)
Vehicle dynamics CAN
The Electronic Stability Program control unit is a dynamics CAN user.
The following signals are read in over the dynamics CAN:
- Status of driver belt buckle switch (S68/3) from Supplemental Restraint System control unit (N2/10)
- Vehicle sprung mass vibrations from the Supplemental Restraint System control unit
Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.
Actuation of components
Components are actuated with the following line:
- Direct line
- Chassis FlexRay
Direct line
The Electronic Stability Program control unit actuates the following components over direct lines:
- Left electric parking brake actuator motor (M76/1)
- Right electric parking brake actuator motor (M76/2)
Chassis FlexRay
The Electronic Stability Program control units sends, for example, the following requests and status messages over the chassis FlexRay to the corresponding control units:
- Request to display messages and warnings to the instrument cluster.
- Status of service brake to front SAM control unit (N10/6)
| Wiring diagram for Electronic Stability Program (ESP (R)) | Model 253 (except 253.99) as of model year 2020 control unit N30/4 model 253.99 as of model year 2019 control unit N30/4 | PE42.45-P-2201-97FCA | |
| Model 253 with engine 177 as of model year 2020 control unit N30/4 | PE42.45-P-2201-97FCB | ||
| Wiring diagram for Adaptive Brake (ABR) | Model 205 up to model year 2019 control unit N30/4 | PE42.47-P-2000-97FBA | |
| Model 205 with engine 177 up to model year 2019 control unit N30/4 (AMG) model 253 (except 253.99) with engine 177 up to model year 2020 control unit N30/4 (AMG) |
PE42.47-P-2000-97FBB | ||
| Model 253 (except 253.99) up to model year 2020 control unit N30/4 | PE42.47-P-2000-97FBC | ||
| Model 205 with engine 177 as of model year 2019 control unit N30/4 | PE42.47-P-2000-97FBD |