Shown on model 205.0 |
A7/3 | Traction system hydraulic unit |
N30/4 | Electronic Stability Program control unit |
P42.45-2766-06
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 assistance package))
Hill Start Assist
Downhill Speed Regulation (DSR) (model 253 with code 430 (Offroad package))
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 assistance package))
Standstill control (SSC)
Steer Assist
Crosswind Assist
Tire pressure loss warning (TPM) (except CODE 475 (Tire pressure monitor))
Permanent Speed Limiter (except for code 23P (Driving Assistance Package) and except for code 494 (USA version))
Variable speed limiter (Speedtronic) (except CODE 23P (Driving assistance package))
Electric parking brake (EFB)
The variable speed limiter and permanent speed limiter functions 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
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:
Brake vacuum sensor (B64/1)
Traction system hydraulic unit
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)
Brake lights switch (S9/1)
Electric parking brake switch status (S76/15) (except model 205.086/087/286/287/386/387/486/487 and model 253.364/388/389/964/988/989)
Chassis FlexRay
The Electronic Stability Program control unit is a chassis-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 (Driving Assistance Package))
Status of circuit 15 of the electronic ignition lock control unit (N73)
Status of trunk lid/liftgate buckle (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)
Currently engaged gear range from fully integrated transmission control unit (Y3/8n4)
Status of drive train 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)
Status of On/Offroad menu button (S70s1) and status of Downhill Speed Regulation button (S70s2) (model 253 with code 430 (Offroad package)) from Audio/COMAND control panel (A40/9)
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 seat 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 (except model 205.086/087/286/287/386/387/486/487 and model 253.364/388/389/964/988/989)
Chassis FlexRay
Direct line (except model 205.086/087/286/287/386/387/486/487 and model 253.364/388/389/964/988/989)
The Electronic Stability Program control unit actuates the following components over direct lines:
Traction system hydraulic unit
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)