View of engine compartment |
A7/3 | Traction system hydraulic unit |
N30/4 | Electronic Stability Program control unit |
P42.47-2055-04
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 233 (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 233 (DISTRONIC PLUS), except code 494 (USA version) and except code 460 (Canada version))
Cruise control (except code 233 (DISTRONIC PLUS))
Model 172.4
up to model year 2017
with code 233 (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
up to model year 2017
except code 233 (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 (CAN E)
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
The Electronic Stability Program control unit is a subscriber to the chassis CAN. It 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)
Electronic selector lever module control unit (N15/5) (with code 427 (9G-TRONIC))
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 233 (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)
Power steering pump quantity control valve (Y10/1) (up to model year 2016)