BMW 7 Series: System Components
ICM Control Unit
Only the system components that are linked to the new architecture of the dynamic driving systems in the F01/F02 are described in this Product Information. In essence, this is the new ICM control unit and the periphery equipment directly connected to this control unit.
Three other Product Information packages are available in which descriptions of the system components for the individual dynamic driving systems are provided:
- Longitudinal dynamics systems
- Lateral dynamics systems
- Vertical dynamics systems
Design of the Two Control Unit Versions
An ICM control unit is installed in every F01/F02. Each ICM control unit contains the following, irrespective of the equipment installed in the vehicle:
- Two microprocessors
- A FlexRay controller
- Output stages for activating valves in the steering system
- Integrated sensor system for driving dynamics variables (previously: DSC sensor)
The essential tasks of one of the microprocessors are the calculation of control functions, communication processing and activation of the output stages. The main task of the second processor is to monitor safety-relevant functions and bring about a system shut down in the event of a fault.
The other components of the ICM control unit listed above are described in the following chapters.
Two versions of the ICM control unit exist. The version installed in the vehicle depends on the equipment.
If the vehicle is equipped with one or both of the following options
- Integral Active Steering (IAL, SA 2VH) or
- Active Cruise Control with Stop&Go function,
the high-performance version of the ICM control unit is installed.
If neither of these options are installed in the vehicle, the basic version of the ICM control unit is used. The two versions of the ICM control unit are differentiated externally by their part numbers.
The internal layout of the high-performance version differs from the internal layout of the basic version in the following ways:
- Larger microprocessor (required to calculate the Integral Active Steering control and active speed control)
- Redundant sensor system for lateral acceleration and yaw rate (safety requirement for Integral Active Steering).
The following graphics make these differences clear.
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Fig. 38: Identifying ICM Control Unit, Basic Version
INDEX REFERENCE CHART
- Acceleration sensor (longitudinal and lateral acceleration)
- Output stages for Servotronic and EVV valves
- Controller for FlexRay connection
- Two microprocessors (basic version)
- Yaw rate sensor
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Fig. 39: Identifying ICM Control Unit, High-Performance Version
INDEX REFERENCE CHART
- Acceleration sensors (1 for longitudinal acceleration, 2 for lateral acceleration)
- Output stages for Servotronic and EVV valves
- Controller for FlexRay connection
- Two microprocessors (high-performance version)
- Yaw rate sensors (2x)
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Integrated Sensor System
The sensors that were previously accommodated separately in the DSC sensor
are now installed in the ICM
control unit.
The ICM control unit uses these sensors to calculate variables that provide key
Replacement And Start-Up
Removing and installing the ICM control unit
The ICM control unit performs tasks that are important for many vehicle
functions, e. g. provision of sensor
signals. If the vehicle were operated without
Periphery Of ICM Control Unit
Bus Systems
Fig. 45: Routing Diagram - ICM Control Unit With Flexray, Local CAN And
Wake-Up Line
INDEX REFERENCE CHART
Central gateway module
Dynamic Stability Control
Short range radar sensor (
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Replacing All Valve Stem Seals (N63)
Notes
IMPORTANT: Risk of damage to sealing lip on valve stem seal.
Fit new valve stem seals only when all valves have been installed.
Necessary preliminary work
Remove all VALVE SPRINGS.
Press special tool 11 6 370 onto the valve stem seal.
Withdraw valve stem seal by turning and simultaneously
Carrying Over Hole Pattern
When replacing a body component, it is necessary to carry over the hole
pattern from the existing body to the
new component.
The following pictures are a schematic representation of carrying over the hole
pattern on the example of the
front wheel arch.
Necessary preliminary tasks
Adjust new part
