turn signal BMW X5 2002 E53 Mk3 Navigation System Manual

5
Mk-3 navigation
GPS (Global Positioning System) Receiver
The GPS receiver module of the previous Mk-2 system is integrated into the housing of the
Mk-3 computer, further reducing the complexity and the number of components used in
the system. The receiver is not serviceable.
The GPS receiver is responsible for receiving the satellite signals and providing the vehicle’s
position information to the navigation computer.
Information provided by the GPS receiver to the navigation computer can be displayed in
the service mode
(see workshop hints) but is not typically used in diagnosis.
Gyro (Rotation) Sensor
The navigation computer contains the electronic (piezo) Gyro sensor that detects rotation
(yaw) of the vehicle as a confirmation that the vehicle is turning. The signal provided by the
gyro is a mili-voltage that changes as the vehicle rotates. The navigation computer uses
the input to track the vehicle along the digitized map and display the exact vehicle position.
The signal is available in the sensor test page of the service mode for diagnosis. The
sensor is not a separately serviceable item and does not require calibration.
Mk-3 computer
GPS antenna
connection18 pin ELO
connectors:
X1313: Violet
X1312: Blue
Integrated GPS receiver and Gyro (rotation) sensor

9
Mk-3 navigation
Speed Signals
A speed signal is provided to the navigation computer for detection of distance traveled and
vehicle speed to calculate the vehicles position on the digital map. The input is a processed
signal provided by the vehicles DSC control unit.
 E46: The speed signal used is from the l le
ef
ft
t
r
re
ea
ar
r
wheel.
 E38/E39/E52/E53: The speed signal used is from the l le
ef
ft
t
f
fr
ro
on
nt
t
wheel.
Reverse Gear Input
The reverse gear input is used by the navigation computer to distinguish between the
vehicle backing up or turning around.
 E38/E39/E52/E53: The reverse input is a high signal produced by the LCM III.
•E46: The reverse input is a high signal supplied by a splice from the back-up lights.
Mk-3 NAV
GS 20 Reverse
lightsReversing
Light Relay
K6325 KL15KL30
LCMMk-3 NAV
Reverse
lights
Automatic Transmission
version shown

11
Mk-3 navigation
The GPS antenna passes the signal to the GPS receiver incorporated in the navigation
computer. A CD with map data is loaded in the CD drive of the navigation computer. The
navigation computer combines the vehicle position calculated by the GPS with this map
data.
The current position of the vehicle can be shown on the on-board monitor by selecting
“Emergency” from the main menu.
The driver can enter a destination. The navigation computer calculates a route from the
current location to this destination based on selectable criteria (main use of highways,
shortest distance, etc.). The calculated route is shown in the route display.
The navigation computer generates the RGB color video signal for all on-board monitor
displays. These three signals are sent over separate shielded wires to the on-board mon-
itor.
In the case of the E52 MIR (also referred as radio navigation) which does not have a color
display, the visual display data is sent via one wire called the navigation bus. On both sys-
tems, color and monochrome display, the audio output from the navigation computer for
voice directions is sent over two separate wires.
The driver has the choice of displays that utilize a color map with an icon of the vehicle
being traced on the map or the use of arrow indicators and distance data shown on the
on-board monitor display. Vehicles equipped with the wide screen board monitor have a
split screen option that includes both display methods. The MIR only makes use of the
arrows and distance display. With the assistance of voice prompts, the navigation
computer indicates how and where to get into the correct lane or turn off.
The navigation computer calculates the distance traveled from the wheel speed signal
delivered by the DSC control unit.
The gyro incorporated into the navigation computer housing informs the navigation com-
puter when the vehicle is turning. An alternative route is re-calculated automatically if the
driver does not follow the original route instructions.
Once the driver has reached their destination, the navigation computer is ready for
another destination input.
Refer to the on-board monitor owners manual for instructions on using the navigation system
software.