Multifunction steering wheel button pad

Which version of the MFL button pad on the left-hand spoke of the multifunction steering wheel is fitted depends on which option, DCC or ACC Stop&Go, is fitted in the vehicle. This does not apply to the MFL button pad on the right-hand spoke, which is the same regardless of whether the vehicle is equipped with DCC or ACC Stop&Go.

The operation and function of the buttons were described in the "functions" section.

Fig 1: LIN Bus Subscribers At Steering Column Switch Cluster

Courtesy of BMW OF NORTH AMERICA, INC.

The electronics of the multifunction steering wheel evaluate the button strokes on both MFL button pads. On the LIN bus, the signals are transmitted to the steering column switch cluster (SZL). The SZL forwards the button stroke signals to the ICM control unit on the FlexRay. This is where the signals for controlling the DCC and ACC Stop&Go function are evaluated.

There is no function illumination on the MFL button pad. For this reason, no feedback is sent by the ICM control unit to the MFL button pad as it is to the driver assistance systems operating unit.