BMW 5 Series Owners & Service Manuals

BMW 5 Series: Control units on the FlexRay

Advanced Crash Safety Module (ACSM)

Control Units
Advanced Crash Safety Module (ACSM)

The function of the Advanced Crash Safety Module (ACSM) is to evaluate all sensor signals in order to identify a crash situation. The ACSM evaluates the information from the sensors and then forwards corresponding measures for selective activation of the necessary restraint systems.

The ACSM records the yaw rate and sends this information on the FlexRay data bus.

No additional yaw sensors are therefore required for the other systems.

Dynamic Stability Control (DSC)

Control Units
Dynamic Stability Control (DSC)

The DSC control unit and the DSC hydraulic control unit are screwed together. The DSC control unit can be replaced individually to reduce servicing costs. The functions of the tire pressure control (TPMS) and the electric parking brake are integrated in the DSC control unit.

Electric Active Roll Stabilization (EARS)

Control Units
Electric active roll stabilization front (EARSV)

Control Units
Electric active roll stabilization rear (EARSH)

Above are the electric active roll stabilization units for the rear EARSH and front EARSV.

The control units for EARS are directly integrated in the corresponding actuator.

Electronic Power Steering (EPS)

Control Units
Electronic Power Steering (EPS)

The Electronic Power Steering (EPS) is supplied with 12 V or 24 V depending on the equipment and engine.

An auxiliary battery, a separating element and a charging unit for the auxiliary battery are required for the 24 V version. These components are installed in the luggage compartment of the G30.

The steering angle information is determined by the EPS and made available to the other control units via the FlexRay bus.

Rear axle slip angle control (HSR)

Control Units
Rear axle slip angle control (HSR)

The control unit for slip angle control is responsible for steering the rear axle.

Optional equipment system (SAS)

Control Units
Optional equipment system (SAS)

The optional equipment system control unit provides a variety of driver assistance functions. The SAS does not have any installed sensors. The information needed for the functions is made available by the corresponding control units and sensors. The SAS activates the control units necessary for the corresponding function.

Possible functions:

  • Collision warning with city braking function
  • Cruise control with braking function
  • Person recognition with city braking function
  • Parking Maneuver Assistant
  • Traffic Jam Assist
  • Camera-based cruise control with Stop & Go function
  • Proactive driving assistant

The image information required by the optional equipment system is provided by the camera-based driver support systems.

Transfer case

Control Units
Transfer case

The control unit for the transfer case controls the clutch in the transfer case on vehicles with xDrive.

Vertical Dynamics Platform (VDP)

Control Units
Vertical Dynamics Platform (VDP)

The control unit for the vertical dynamic platform is required for the following equipment:

  • Dynamic Damper Control

The VDP control unit is responsible for:

  • Valve control in the shock absorbers
  • Detection of vehicle ride heights by the ride height sensors

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