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166n

Rain sensor*

Depending on the degree of wetness

on the windshield, the rain sensor con-

trols the operation of the windshield

wipers.

Infrared light is carried along the sur-

face of the windshield in an optical con-

ductor in such a manner that it is re-

flected completely when the windshield

is dry. The quantity of reflected light is

measured.

If there is moisture on the glass, the

amount of light reflected is reduced

since the infrared light at the surface of

the windshield can escape. The quan-

tity of reflected light is thus a means of

gauging the degree of wetness on the

windshield.

390de133

When the system is set to the "Intermit-

tent" wiper speed, the wipers react im-

mediately – if water is splashed onto

the windshield by vehicles traveling

ahead of you, for example. As a result,

the rain sensor provides a contribution

to driving safety and comfort.

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BMW 3 ELECTICAL SYSTEM Bedienungshandbuch Seite 166