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

MODEL 212 (except 212.095/098/298) as of model year 2014 

Shown on model 212.0 

Fig 1: Electronic Stability Program Control Unit

Courtesy of MERCEDES-BENZ USA

Location 

The Premium Electronic Stability Program control unit is on the traction system hydraulic unit at the front left inside the engine compartment.

Task 

The Electronic Stability Program control unit (except CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG vehicles)) or the Premium Electronic Stability Program control unit (with CODE 233 (DISTRONIC PLUS) or with CODE 990 (AMG vehicles)) contains the control elements for the following systems:

• Electronic Stability Program (ESP)
• Electronic brake force distribution (EBD [EBV])
• Anti-lock braking system (ABS)
• Acceleration skid control (ASR)
• Brake assist system (BAS)
• Electronic traction system (ETS)
• Tire pressure loss warning (RDW) (except CODE 475 (Tire pressure monitor (premium)))
• PRE-SAFE® system
• Automatic lane recognition (ALR) (with CODE 476 (Automatic lane recognition)
• Standstill coordinator (SSK)
• Variable speed limiter (except CODE 233 (DISTRONIC PLUS), except CODE 494 (USA version) and except CODE 460 (Canada version))
• Cruise control (CC) (except CODE 233 (DISTRONIC PLUS) and with CODE 440 (Cruise control))
• HOLD function
• Precharging, depending on accelerator pedal actuation
• Precharging, depending on lateral acceleration
• Dry braking
• ASR and ESP passive switching
• Adaptive brake lights, flashing (except with CODE 494 (USA version))
• PRE-SAFE
• Hill-Start Assist (HSA)
• Fading brake support
• Air gap reduction (Airgap)
• Deceleration coordination of DISTRONIC PLUS (with CODE 233 (DISTRONIC PLUS))
• ESP trailer stabilization (with CODE 550 (Trailer hitch))

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 or Premium Electronic Stability Program control unit has the following tasks:

• Reading in of sensors, pickups and signals 
• Evaluation of input factors 

Reading in of sensors, pickups and 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:

• 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 (except CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG vehicles)) or the Premium Electronic Stability Program control unit (with CODE 233 (DISTRONIC PLUS)) or with CODE 990 (AMG vehicles)) is a subscriber on chassis CAN 1. It communicates with, for example, the following control unit:

• AIRmatic control unit (N51/3), with code 489 (AIRmatic (air suspension with continuous variable damping))
• Supplemental restraint system control unit, component description (N2/10)
• Radar sensors control unit (N62/1) (with CODE 23P (Driving assistance package))
• CDI control unit (N3/9) (with diesel engine) or ME-SFI [ME] control unit (N3/10) (with gasoline engine)
• Front SAM control unit with fuse and relay module (N10/1)
• Steering column tube module control unit (N80)
• Fully integrated transmission control unit (Y3/8n4)
• Instrument cluster (A1)
• Rear SAM control unit with fuse and relay module (N10/2)

Vehicle dynamics CAN 

The data from the following component are read in via the vehicle dynamics CAN:

• 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 

Direct line 

The following components are actuated via direct lines:

• Rear SAM control unit with fuse and relay module (N10/2) (brake light actuation)
• Yaw rate sensor for lateral and longitudinal acceleration (power supply)
• Front SAM control unit with fuse and relay module (standstill coordinator status)
• Navigation processor (N41/1) (vehicle speed signal from left front axle RPM sensor), with CODE 965 (Electrical preinstallation for rental vehicle), with CODE 830 (China version) or with CODE 835 (South Korea version)
• Traction system hydraulic unit (A7/3)
• Power supply for yaw rate sensor for lateral and longitudinal acceleration