X Series E83 X3 2.5Si (N52K) OFFRD
SE: South East
S:
South
SW: South West
W: West
NW: North West
The changeover between displays is carried out as follows:
•
The current vehicle position is the centre of a 360
°
circle.
•
The eight points of the compass divide these 360
°
into sixteen 22.5
°
segments.
•
The display changes over if the direction of travel changes by more than 22.5
°
.
Brightness control of display
2 photocells in the electrochromic interior mirror record the surrounding brightness (1 photocell for the
surrounding brightness coming from the front, 1 photocell for the surrounding brightness coming from the rear).
The photocells deliver the signals for the display brightness control.
The brightness of the display is adjusted by the interior mirror control electronics to suit the surrounding
brightness.
Adjustment of magnetic field zones and calibration
The worldwide magnetic field zones are permanently stored in the interior mirror. The magnetic field zones
represent the deviations in relation to an ideal magnetic field for earth. The orientation "North" is precisely
determined by the magnetic field zones.
The current magnetic field zone may be adjusted according to the geographic location. For example, Germany is
located in magnetic field zone "8".
A vehicle has its own magnetic field. This makes it possible for the magnetic field sensor to measure an
overlapping of the magnetic field with the earth's magnetic field. This overlapping is "worked out" by calibrating
the compass.
A changed magnetic field is normally calibrated "automatically".
The vehicle's magnetic field may change under the following special circumstances:
•
Powerful vibration during an accident
•
Very large external magnetic field - e.g. if a vehicle passes under a train when travelling through an
underpass
However, a manual calibration may speed up the automatic calibration.
For procedure to be followed when setting the magnet field zones as well as manual calibration: see notes for
service staff.
from 09/2006: Further adjustments
Different time-based adjustment menus can be obtained by means of the adjustment button:
•
0 to 3 seconds: Display ON/OFF
•
3 to 6 seconds: Adjustment of magnetic field zones (0 -15)
•
6 to 9 seconds: Calibration (C)
•
9 to 12 seconds: Left-hand drive or right-hand drive (L or R)
•
12 to 15 seconds: English or German (E or O)
SBT Interior mirror with digital compass E70, E83, E90, E91, E92, E93
BMW AG - TIS
12.02.2013 10:29
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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