The system has 2 phases of warning depending on how close the potential collision is determined to be.
Phase 1 has no audible warning but only hte red car symbol.
Phase 2 has a audible warning
From BMW:
Quote:
The advance warning is represented by the red car symbol in the instrument cluster. In
the event of an advance warning, it lights up constantly. As there is no audible signal, this
visual warning signal is the only signal for the advance warning.
In the event of an acute warning, the car symbol in the instrument cluster begins to flash.
Since an immediate intervention by the driver is required, this visual signal is supplemented
by an audible tone.
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The system is not always able to help if someone cuts in front of you.
The system will also not brake for objects that are already standing still when it firsts sees them, only for objects slowing down or moving slowly ahead of you.
These are Bosch systems, not BMW. The current 7 Series system is also quite a few years old now, with newer systems working better.