Driver assistance systems operating unit

Fig 1: Identifying Driver Assistance Systems Operating Unit Buttons

Courtesy of BMW OF NORTH AMERICA, INC.

The driver assistance systems operating unit contains a button for switching the collision warning on and off. The operating unit is connected to the footwell module (FRM) on the LIN bus. A bus signal from the FRM notifies the ICM control unit when the button has been pressed.

Fig 2: LIN Bus Subscribers At Footwell Module

Courtesy of BMW OF NORTH AMERICA, INC.

The ICM does not allow the collision warning to switch on unless the entire system is working faultlessly. It is only then that a bus signal providing positive feedback is sent to the FRM in order to have the function illumination in the button light up. If, however, a fault is present in any part of the entire system, the function illumination remains off even if the button is pressed. From this, the driver can infer that the collision warning is not available.