Component description for ESP control unit - GF42.45-P-5118LE

MODEL 216.3, 221.0 /1 (except, 221.095 /195) as of model year 2009 /YoM 08

Shown on model 221

Fig 1: Identifying Traction System Hydraulic Unit And ESP Control Unit (Shown On Model 221)

Courtesy of MERCEDES-BENZ USA

Location

The ESP control unit is located at the right front traction system hydraulic unit in the engine compartment behind the right front lamp unit (E2).

Model 221 as of 1.6.09, model 216 as of 1.9.10

Adaptive Brake (ABR) is available in 2 variants:

Basic ABR system (except code 233 (DISTRONIC PLUS) and code 239 (Adaptive cruise control Plus Light))
Premium ABR system (with code 233 (DISTRONIC PLUS) and code 239 (Adaptive cruise control Plus Light))

Task

The ESP control unit has the following tasks:

Control of functions
Reading in of sensors, pickups and signals
Evaluating input factors
Actuation of components

Control of functions

The ESP control unit actuates the following systems:

Electronic Stability Program (ESP)
Antilock brake system (ABS)
Acceleration skid control (ASR)
Electronic traction system (ETS)
Engine braking regulation (MSR)
Brake Assist (BAS)
Tire pressure loss warning (RDW), except code (475) Tire pressure monitor (premium)
PRE-SAFE(r) system, PRE-SENSE, model 221 as of 2.6.09, model 216 as of 1.9.10
Cruise control (CC)
Variable speed limiter, except code (494) USA version
Speed-sensitive power steering (SPS)
Added value functions (e.g. HOLD function, precharging, dry braking, Hill-Start Assist)
Deceleration coordination of Distronic (DTR), with code (219) Distronic (DTR)
ATTENTION ASSIST (tiredness detection system), model 221 as of 2.6.09, model 216 as of 1.9.10

Reading in of sensors, pickups and signals

The input factors are read in via the following connections:

Direct line
Chassis CAN (CAN E)
Vehicle dynamics CAN (CAN H)

Direct line

The following components are read in via direct lines:

BAS membrane travel sensor (A7/7b1), model 221 up to 31.5.09, model 216 up to 31.8.10, model 221 as of 1.6.09 or model 216 as of 1.9.10 with premium system
BAS release switch (A7/7s1), model 221 up to 31.5.09, model 216 up to 31.8.10, model 221 as of 1.6.09 or model 216 as of 1.9.10 with premium system
Attention assistance system sensor (B24/8), model 221 as of 1.6.09, model 216 as of 1.9.10
Left front rpm sensor (L6/1)
Right front rpm sensor (L6/2)
Left rear rpm sensor (L6/3)
Right rear rpm sensor (L6/4)
Brake light switch (S9/1), model 221 as of 1.6.09 or model 216 as of 1.9.10 with basic system
Brake vacuum sensor (B64/1) with code (B03) ECO start/ stop function

Chassis CAN

The ESP control unit is a subscriber of the chassis CAN. It communicates for instance with the following control units:

Central gateway control unit (N93)
Instrument cluster (A1)

Vehicle dynamics CAN

The ESP control unit is a subscriber of the vehicle dynamics CAN. It communicates, for example, with the following sensor and control unit:

Yaw rate sensor for lateral and longitudinal acceleration (B24/15)
DTR controller unit (A89), with code (219) Distronic (DTR)

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

Chassis CAN

The signals are transmitted by the ESP control unit via the chassis CAN. The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Components are actuated via the following lines:

Direct line
Chassis CAN

Direct line

The following components are actuated via direct lines:

BAS solenoid valve (A7/7y1), model 221 up to 31.5.09, model 216 up to 31.8.10, model 221 as of 1.6.09 or model 216 as of 1.9.10 with premium system
Brake light actuation (circuit 54) to rear SAM control unit with fuse and relay module (N10/2)
PML solenoid valve (Y10) (except electrohydraulic power steering)