Honda Odyssey 2004. Manual — part 507
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01
Display Unit Inputs and Outputs for Connector B (20P)
Terminal
number
Wire color
Terminal
Terminal name
Description
22-356
Navigation System
System Description (cont’d)
DISPLAY UNIT CONNECTOR B (20P)
1
WHT/BLU
B
B power source
Continuous power source
2
WHT/RED
ACC
Accessory
Power source for accessory
5
BLU/GRN
DISP BUS (
)
Display bus positive
Data bus (
)
8
WHT
R SIG
Red signal
Red color signal
9
RED
G SIG
Green signal
Green color signal
10
BLK
GND
Ground
Ground for display unit
11
RED/BLK
ILL
Illumination positive
Parking light ON signal
12
RED
ILL
Illumination negative
Parking light ON signal
14
LT BLU
SH DISP BUS
Shield display bus
Shield for display bus
15
ORN/BLU
DISP BUS (
)
Display bus negative
Data bus (
)
17
BLU
GND SIG
Ground signal
Ground for color signal
18
YEL
B SIG
Blue signal
Blue color signal
19
GRN
C SIG
Composite signal
Composite video (vertical/horizontal)
synchronizing signal
20
BRN/BLK
SH SIG
Shield signal
Shield for terminal No. 8, 9, 17, 18, 19
Wire side of female terminals
03/07/29 10:28:35 61S0X050_220_0358
*05
Overview
System Diagram
22-357
DISPLAY UNIT
AUDIO UNIT
MUTE SIGNAL/
VOICE OUTPUT
FRONT
SPEAKERS
DISPLAY BUS
(GA-NET II)
PICTURE/
COLOR
SIGNAL
NAVIGATION UNIT
YAW RATE
SENSOR
DVD-
ROM
GPS
RECEIVER
VEHICLE SPEED PULSE
(VSP) SENSOR
GPS ANTENNA
CLIMATE CONTROL
UNIT
ILLUMINATION
SIGNAL
REVERSE
(BACK UP) SIGNAL
CHARGING
SIGNAL
The Honda Navigation System is a highly-sophisticated, hybrid locating system that uses satellites and a map
database to show you where you are and to help guide you to a desired destination.
The navigation system receives signals from the global positioning system (GPS), a network of 24 satellites in orbit
around the earth. By receiving signals from serveral of these satellites, the navigation system can determine the
latitude and longitude of the vehicle. In addition, signals from the system’s yaw rate sensor and the vehicle speed
pulse (VSP) sensor enable the system to keep track of the vehicle’s direction and speed of travel.
This hybrid system has advantages over a system that is either entirely self-contained or one that relies totally on the
GPS. For example, the self-contained portion of the system can keep track of vehicle position even when satellite
signals cannot be received, and the GPS can keep track of the vehicle position even when the vehicle is transported by
ferry.
The navigation system applies all this location, direction, and speed information to the maps and calculates a route to
the destination entered. As you drive to that destination, the system provides both visual and audio guidance.
(cont’d)
03/07/29 10:28:36 61S0X050_220_0359
03
*11
Navigation Function
Function Diagram
Vehicle Speed Pulse (VSP) Sensor
22-358
Navigation System
System Description (cont’d)
GPS ANTENNA
VEHICLE SPEED
PULSE (VSP)
SENSOR
GPS RECEIVER
Detection of
vehicle position
Perception of
vehicle position
YAW RATE SENSOR
NAVIGATION UNIT
DISPLAY UNIT
Reception of radio
wave from satellite
Correction of
map matching
Data process
concerning map
and vehicle position
SWITCH
LCD
Detection of
travel distance
GPS tuning
Detection of
direction change
DVD-ROM
Map scroll
Change of reduced
scale of map
Guide
processing
Destination
VEHICLE SPEED
PULSE (VSP) SENSOR (’00-01)
PCM (’02-04)
NAVIGATION UNIT
Sensor power
DISTANCE
DETECTION
CIRCUIT
The navigation system is composed of the navigation unit, the vehicle speed pulse (VSP) sensor, the GPS antenna,
and the display unit.
The vehicle speed pulse (VSP) sensor is driven by the differential gear (’00-01) or the PCM (’02-04). For every
revolution of the wheel, a four-pulse signal is sent to the navigation unit. The VSP outputs the distance signal by
turning the navigation unit’s sensor power on and off.
03/07/29 10:28:36 61S0X050_220_0360
*06
Yaw Rate Sensor
Sensor Element Structure
Oscillation Gyro Principles
Operation
22-359
Enlarged view of sensor element
DETECTING PIEZOELECTRIC
PARTS
OSCILLATORS
SUPPORT PIN
DRIVING
PIEZOELECTRIC
PART
METAL BLOCK
MONITORING PIEZOELECTRIC
PART
Bend
Oscillation
Coriolis force
Turn to
right
Coriolis force
Oscillation
Sensor element top view
The yaw rate sensor detects the direction change (angular speed) of the vehicle. The sensor is an oscillation gyro built
into the navigation unit.
The sensor element is shaped like a tuning fork, and it consists of the piezoelectric parts, the metal block, and the
support pin. There are four piezoelectric parts: one to drive the oscillators, one to monitor and maintain the oscillation
at a regular frequency, and two to detect angular velocity. The two oscillators, which have a 90 degree twist in the
center, are connected at the bottom by the metal block, and supported by the support pin. A detection piezoelectric
part is attached to the top of each oscillator. The driving piezoelectric part is attached to the bottom of one oscillator,
and the monitoring piezoelectric part is attached to the bottom of the other oscillator.
The piezoelectric parts have ‘‘electric/mechanical transfer characteristics.’’ They bend vertically when voltage is
applied to both sides of the parts, and voltage is generated between both sides of the piezoelectoric parts when they
are bent by an external force. The oscillation gyro fuctions by utilizing this characteristic of the piezoelectric parts and
‘‘Coriolis force.’’ (Coriolis force deflects moving objects as a result of the earth’s rotation.) In the oscillation gyro, this
force moves the sensor element when angular velocity is applied.
1. The driving piezoelectric part oscillates the oscillator by repeatedly bending and returning when an AC voltage at
6 kHz is applied to the part. The monitoring-side oscillator resonates because it is connected to the driving-side
oscillator by the metal block.
2. The monitoring piezoelectric part bend in proportion to the oscillation and outputs voltage (the monitor signal).
The navigation unit control circuit controls the drive signal to stabilize the monitor signal.
3. When the vehicle is stopped, the detecting piezoelectric parts oscillate right and left with the oscillators, but no
signal is output because the parts are not bent (no angular force).
4. When the vehicle turns to the right, the sensor element moves in a circular motion with the right oscillator
bending forward and the left oscillator bending rearward. The amount of forward/rearward bend varies according
to the angular velocity of the vehicle.
5. The detecting piezoelectric parts output voltage (the yaw rate signal) according to the amount of bend. The
amount of vehicle direction change is determined by measuring this voltage.
(cont’d)
03/07/29 10:28:37 61S0X050_220_0361
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