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EnglishAdvanced technology -> Rain sensor for your BMW 7 Series 2001-2007
192nRearview mirror with automatic dimmer
Rain sensor*
The semisolid reacts chemically to this
electrical current, thus providing infi-
nitely-variable dimming of the mirror
(electrochromic technology).
As a result, it is no longer necessary to
dim the mirror manually, and the driver
can maintain full concentration on traf-
fic.
The interior rearview mirror with auto-
matic dimming feature reduces glare
from following traffic by adapting the in-
tensity of the reflected images to corre-
spond to levels of light registered by
the unit's sensors. The mirror reverts to
its undimmed setting as soon as the
light source disappears. One of these
sensors is mounted on the front of the
mirror housing and is designed to mon-
itor light levels in the area forward of
the vehicle. The second sensor is inte-
grated within the mirror's glass. The
electronic control system operates by
comparing the respective levels of lumi-
nous intensity in front of and behind the
car. The difference provides the basic
parameter used to modulate an electri-
cal current and induce chemical
The rain sensor controls windshield
wiper operation, depending on how wet
the windshield is.
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.
changes in a semisolid layer incorpo-
rated in the lens.
Online Edition for Part No. 01 41 0 004 597 - © 08/99 BMW Group
Rain sensor*
Tire Pressure Control (RDC)*
193n
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 driv-
ing safety and comfort.
Near every wheel is an antenna in the
body that receives the signal from the
wheel. A central electronics system
evaluates the quadruple signals and
forwards any changes.
The RDC provides an important contri-
bution to driving safety.
The Tire Pressure Control system as-
sumes the task of regular tire pressure
checks for you. Tire pressures are mon-
itored at all four wheels, even when the
vehicle is moving.
Behind the valve stem in every wheel,
there is an electronic chip which is de-
signed for severe-duty applications and
long service life. It contains a pressure
sensor, a transmitter and a battery. The
pressure is measured in extremely short
time intervals and then transmitted by a
radio signal. If an irregularity is de-
tected, the transmission rate is in-
creased.
Online Edition for Part No. 01 41 0 004 597 - © 08/99 BMW Group
