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

Model 172.4 

as of Model year 2017 

View of engine compartment 

Location 

The Electronic Stability Program control unit is located on the traction system hydraulic unit in the front left of the engine compartment.

Tasks 

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

• Speed-sensitive power steering
• 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 239 (DISTRONIC PLUS))
• Hill Start Assist
• Dry braking
• Precharging, depending on accelerator pedal actuation
• Precharging, depending on lateral acceleration
• HOLD function
• PRE-SAFE® system
• Switch off ASR and ESP®
• Standstill check
• Tire pressure loss warning (TPM) (except CODE 475 (Tire pressure monitor))
• Variable speed limiter (except CODE 239 (DISTRONIC PLUS), except CODE 494 (USA version) and except CODE 460 (Canada version))
• Cruise control (except CODE 239 (DISTRONIC PLUS))

Model 172.4

as of Model year 2017

with code 239 (DISTRONIC PLUS)

With the ADAPTIVE Brake premium system, the data from the turn rate, lateral acceleration and longitudinal acceleration sensor (B24/15) is read in by the Electronic Stability Program control unit via the vehicle dynamics CAN.

Model 172.4

as of Model year 2017

except code 239 (DISTRONIC PLUS)

With the ADAPTIVE Brake basic system, the turn rate, lateral acceleration and longitudinal acceleration sensor is integrated in the Electronic Stability Program control unit, thereby making a CAN connection to an external turn rate, lateral acceleration and longitudinal acceleration sensor unnecessary. The data for turn rate, lateral acceleration and longitudinal acceleration is therefore collected and evaluated directly by the Electronic Stability Program control unit.

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 over 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:

• Circuit 30
• Circuit 31
• Brake vacuum sensor (B64/1) (with CODE B03 (ECO start/stop function))
• Brake lights switch (S9/1)
• 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)

Chassis CAN 1 

The Electronic Stability Program control unit is a subscriber of chassis CAN 1 and communicates with the following control units:

• Instrument cluster (A1)
• Supplemental Restraint System control unit (N2/10)
• CDI control unit (with diesel engine) (N3/9)
• ME-SFI [ME] control unit (with gasoline engine) (N3/10)
• Front SAM control unit with fuse and relay module (N10/1)
• Rear SAM control unit with fuse and relay module (N10/2)
• DIRECT SELECT INTERFACE (N150) (with code 421 (9G-TRONIC))
• Upper control panel control unit (N72/1)
• Electronic ignition lock control unit (N73)
• Steering column tube module control unit (N80)
• Electric parking Brake control unit (N128)
• Fully integrated transmission control unit (Y3/8n4) (with automatic transmission)

Vehicle dynamics CAN 

Signals are read in via the vehicle dynamics CAN from the following components:

• Turn rate, lateral acceleration and longitudinal acceleration sensor (with code 239 (DISTRONIC PLUS))

Evaluation of input factors 

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

Actuation of components 

Components are actuated with the following line:

• Direct line 

Direct line 

The following components are actuated via direct lines:

• Rear SAM control unit with fuse and relay module (Brake light actuation)
• Traction system hydraulic unit
• Speed-sensitive power steering solenoid valve (Y10)

Wiring diagram for Adaptive Brake (ABR)

PE42.47-P-2000-97TAA