GF42.45-P-5118LE ESP Control Unit, Component Description

GF42.45-P-5118LE ESP control unit, component description

Component Identification:

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).

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 Control (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 CY 09 model refinement package)
- Cruise control (CC [TPM])
- Limiter, except code (494) USA version
- Speed-sensitive power steering (PML), except following models:
- 221.022/054/056/070/071/080/084/086/087 as CY 09 model refinement package
- 221.122/154/156/170/171/180/184/186/187 as CY 09 model refinement package
- 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 (fatigue detection), model 221 as of CY 09 model refinement package

Reading in of sensors, pickups and signals
The input factors are read in with the following connections:
^ Direct line
^ Chassis CAN (CAN E)
^ Vehicle dynamics CAN (CAN H)

Direct line
The following components are read in through direct lines:

- BAS membrane travel sensor (A7/7b1), except model 221 as of CY 09 model refinement package
- BAS release switch (A7/7s1), except model 221 as of CY 09 model refinement package
- Attention assist sensor (B24/8), model 221 as of CY 09 model refinement package
- 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 CY 09 model refinement package

Chassis CAN
The ESP control unit is a chassis CAN user. 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 vehicle dynamics CAN user. It communicates for instance with the following control units:

- 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
Components are actuated with the following lines:
^ Direct line
^ Chassis CAN

Direct line
The following components are actuated via direct lines:

- BAS solenoid valve (A7/7y1), except model 221 as of CY 09 model refinement package
- Brake light actuation (circuit 54) to rear SAM control unit with fuse and relay module (N10/2)
- Speed-sensitive power steering solenoid valve (Y10), except following models:
- 221.022/054/056/070/071/080/084/086/087 as CY 09 model refinement package
- 221.122/154/156/170/171/180/184/186/187 as CY 09 model refinement package

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).