ICM: Control unit for Integrated Chassis Management

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The ICM control unit networks the suspension control systems to allow hierarchically-structured control of the vehicle's dynamic-response functions. Passive (airbag) and active safety systems have been integrated within the 2nd generation of the ICM control unit. Depending on the optional equipment selected (e.g. Vertical Dynamics Management VDM) and the national-market version (e.g. US version), several sensors are installed in the ICM control unit:

Longitudinal acceleration sensor (maximum 3 pieces)
Lateral-acceleration sensors (maximum of 3)
Vertical acceleration sensor
Yaw rate sensor
Pitch rate sensor
Rotation-rate sensor

Fig 1: Identifying ICM Control Unit And Plug Connection
Courtesy of BMW OF NORTH AMERICA, INC.

Item	Explanation
1	ICM control unit
2	54-pin plug connection

The sensor signals refer primarily to the co-ordinates of the sensor housing. The sensor signal values depend on the installation position. However, the driving stability control needs these variables related to the co-ordinate system of the vehicle. The ICM control unit converts the values accordingly (definition of the zero point).

An adjustment of the integrated sensors is necessary after replacement of the ICM control unit. The adjustment must take place while the vehicle is on a subsurface that is horizontal in longitudinal direction and transverse direction. Terminal 15 must be switched on.