LIN-bus Connections

Fig 1: LIN Bus Connections At Footwell Module

Courtesy of BMW OF NORTH AMERICA, INC.

LIN BUS CONNECTIONS REFERENCE CHART

Index	Explanation
ASP_FA	Driver's door mirror
ASP_BF	Front passenger door mirror
BE_FAS	Operating unit for driver assistance systems
FRM	Footwell module

The operating unit for the driver assistance systems is fitted with a button that can switch the Active Blind Spot Detection system on and off.

The operating unit is connected via the LIN bus to the footwell module (FRM). A bus signal from the FRM to the ICM is used to inform that the button has been pressed.

The ICM only permits the Active Blind Spot Detection to be switched on, if the system is working faultlessly. Only then does it send a positive response via a bus signal to the FRM, to activate the function illumination on the button.

If instead there is a fault with the system, the function illumination remains off despite being pressed. The driver will then know that the system is not available.