sensor ACURA CSX 2006 Service Repair Manual

µµµ
ColumnDescription Problem indication
Yaw Rate
23-144Navigation System
System Diagnostic Mode (cont’d)
The table of values shown define the terms at the top of
the columns in the GPS detail screen.
3D Active satellites (Yellow Dot) If 3D is missing
follow GPS icon is
white or not shown
(see page 23-122).
PRN The satellite ID number
ST The status: 0 = cannot view or
searching,
2 = acquiring If all 0, then, follow
GPS icon is white
or not shown
troubleshooting
(see page 23-122).
AZI Azimuth, the angle (0 360) clockwise
from north
EL Elevation from the horizon
(90 deg is overhead)
C/N N/A Healthy signal is 49 52,
no signal: 27 33
ACC N/A This diagnostic checks the yaw rate sensor in the
control unit. This device detects when the vehicle turns,
and repositions the vehicle position icon on the map
screen. For more detailed information, see the yaw rate
sensor theory of operation under System Description
(see page 23-105).
 Sensor indicates the voltage output from the yaw rate sensor. It should indicate about 2.500 V when the
vehicle is stopped.
 Offset is the reference voltage or standard within the yaw rate sensor. It also should indicate about 2.500 V
when the vehicle is stopped.
 A sensor output voltage LOWER than the Offset voltage indicates that the vehicle is turning to the
right.
A sensor output voltage HIGHER than the Offset
voltage indicates that the vehicle is turning to the left.
 The yaw rate offset and sensor should both indicate about 2.500 V when the vehicle is stopped. If either
reads zero or 5.000 V, replace the navigation unit.
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´µ
µ
Î Example: Vehicle stopped
Normal Abnormal
Example: Vehicle turning
Normal AbnormalYaw Rate Tuning
23-145
Yaw RateReturn
Sensor Offset
CCW Factor
CW Factor x.xxxV
x.xxxV
0.0%
0.0% Set
Tuning
 The yaw rate offset and sensor should be within /
0.01 V of each other when the vehicle is stopped. The
sensor value should change relative to the offset as
the vehicle turns while driving. If not, replace the
navigation unit.
Offset 2.526 V Offset 2.526 V
Sensor 2.516 2.536 V Sensor 2.623 V
Offset 2.526 V Offset 2.526 V
Sensor 2.678 V (right turn)
2.478 V
(left turn) Sensor 2.623 V
(no change on
turns)
The settings CCW Cal Factor, CW Cal Factor, and Set
are for factory use only. THIS SHOULD NEVER BE
USED.
NOTE: Do not try to adjust the yaw rate sensor without
instructions from the factory. See next paragraph for
tuning. This diagnostic allows you to graphically display
problems with the yaw rate sensor.
 The ANG-Disp value accumulates any differences between the offset and sensor voltages (see Yaw
Rate diagnostic). When the sensor functions properly,
the random changes in these two voltages generally
cancels out, so the value is 0. However if one voltage
is consistently higher than the other, then the ANG-
Disp value accumulates the constant change.
 The Reset button temporarily clears the angular accumulation (ANG-Disp), and clears the display dots.
 Do not touch the CCW or CW, or Set buttons. These are used for factory setup only.
For serious problems with the sensor, the stationary
test usually confirms whether the sensor is defective.
For yaw rate issues related to driving, perform the road
test described.
(cont’d)
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ÎÎ
µ
µ
Tire Calibration
23-146Navigation System
System Diagnostic Mode (cont’d)
Return
Set
Reset
CCW CW
Tuning 0.0%
ANG-Disp 0° Return
Auto Tuning OFF
Level0
xx.xx%
Set
Study
Tire Cal. TuningTire Calibrate
ON
OFF
1. Stationary test: If the VP icon spins in place and the ANG-Disp value slowly increases or decreases in
value, the yaw rate sensor is defective. Replace the
navigation unit.
2. Road test: Drive the vehicle on a very straight road. Enter the diagnostic mode, select Yaw rate, and
touch the Tuning button. While driving down a
straight road, the white dots should trace a straight
line across the screen. However, if you are driving
on a straight road, and you notice the dots
constantly dropping down or heading up as you
drive, the navigation unit’s yaw sensor is defective.
You can touch Reset to clear ANG-Disp, and dotted
line.
3. If either test fails, please enter ‘‘Yaw rate sensor defective’’ for the problem description, on the
‘‘Navigation core return form’’. As the vehicle moves, the navigation system receives
speed pulses from the ECM/PCM. These pulses are
converted using a conversion factor to a mph speed
that moves the vehicle position (VP) on the map. The
navigation system has an internal tuning function that
generates and refines this factor based on actual
driving. The Level indicates the status of the tuning. At
navigation initialization, it begins at 0, and increases to
10 as the navigation system is used.
 The Auto Tuning is factory set to ON, and should remain on.
 The Study indicates the tuning status. If it is less than 10, the unit is still calibrating.
 The Tire-Cal. Tuning and Set should not be used. It is for factory use only.
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ÎWith navigation
23-166Audio System
System Description (cont’d)
Reverse signal
GPS antenna
AM/FM antenna Speakers
Navigation unit
Navi DVD
Navigation/Audio Display Screen
CLOCK
(Set by GPS)Color
signal
XM antenna
(satellite &
terrestrial)
Auxiliary jack
assembly
Audio remote
switches
(steering wheel)
Illumination
Signal
(lighted buttons)
AM/FM
receiverCD Player
(CD, MP3, WMA)
Audio
processor
PC Card Slot (for playing audio
MP3, and WMA audio files) Navi
processor
(ECU)
GPS
receiver
Yaw rate sensor
(senses turning)
DVD player
(navi maps)
GA-net
Audio
Section
Navigaion
Section
Illumination
(Night/Day
display mode)
ECM/PCM
(vehicle speed pulses) Voice control switch
USB Adapter unit
XM Receiver HandsFreeLink
control unitMicrophone
HFL TALK/BACK
buttons
Navigation
TALK/BACK
buttons
Stereo Amplifier
(Type S model)
Climate
control unit
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(#'#
)
General Operation
Anti-theft Feature
Symptom Diagnosis
Self-Inertial Navigation LimitationsGlobal Positioning System (GPS) Limitations
23-266Navigation System
General Troubleshooting Information
Refer to the navigation system manual for the
navigation system operating procedures.
The navigation system and audio unit have a coded
theft protection circuit. Make sure you have the anti-
theft security code before:
 Disconnecting the battery.
 Disconnecting the navigation unit connector A (24P) and C (8P).
 Removing the No. 23 (10 A) fuse from the under-hood fuse/relay box.
After service, reconnect power to the navigation unit,
and turn the ignition switch to ON (II). Enter the 4-digit
anti-theft security code, then select Done.
If the code cannot be found, use the interactive Network
(iN) to look it up. You can view the serial number in one
of the ECU Info diagnostic screens (see page 23-305).
Alternatively, you can find the serial number on the
underside label which is located on the navigation unit
in the trunk.
When replacing the navigation unit, be sure to give the
customer the new anti-theft security code.
Certain circumstances and system limitations will result
in occasional vehicle positioning errors. Some client’s
may think this indicates a problem with the navigation
system when, in fact, the system is normal. Keep the
following items in mind when interviewing client’s
about symptoms of the navigation system.
The limitations of the self-inertial portion of the
navigation system (the yaw rate sensor and the vehicle
speed signal) can cause discrepancies between the
vehicle’s actual position and the indicated vehicle’s
position (GPS vehicle position). The following circumstances may cause vehicle
positioning errors:
 Moving the vehicle with the engine stopped and the vehicle stopped, such as by ferry or tow truck, or if
the vehicle is spun on a turn table.
 Tire slippage, changes in tire rolling diameters, and some driving situations may cause discrepancies in
travel distances. Examples of this include:
– Continuous tire slippage on a slippery surface
– Driving with snow chains mounted
– Abnormal tire pressure
– Incorrect tire size
– Frequent lane changes across a wide highway
– Continuous driving on a straight or gently curving highway
– Very bumpy roads
 Tolerances in the system and map inaccuracies sometimes limit how precisely the vehicle’s position
is indicated. Examples of this include:
– Driving on roads not shown on the map (map matching is not possible)
– Driving on a road that winds in one direction, such as a loop bridge, an interchange, or a spiral parking
garage
– Driving on a road with a series of sharp hair-pin turns
– Driving near a gradual highway exit or transition
– Driving on one of two close parallel roads
– Making many 90 degree turns
The GPS cannot detect the vehicle’s position or
elevation during the following instances:  For the first 5 to 10 minutes after reconnecting the battery (this process can take as long as 45 minutes).
 When the satellite signals are blocked by tall buildings, mountains, tunnels, large trees, inside
parking structures or large trucks.
 When the GPS antenna is blocked by metallic window tinting or by an object placed above it in the
vehicle. The GPS antenna requires a clear
unobstructed view of the sky.
 When there is no satellite signal output (signal output is sometimes stopped for sate llite servicing).
 When the satellite signals are blocked by the operation of some electronic aftermarket accessories
including, but not limited to non-OEM in-dash
entertainment units (radio, CD players/changers,
radar detectors and theft recovery systems) and cell
phones placed near the navigation system.
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Î
ÎÎ
Î
How to Check Error History
Hardware Error History
Software Error (Soft error) History
23-273
Return
System Links Help
Exit Diag
ReturnReturn
Navi.ECUSelect Diagnosis Items Self- Diagnosis Mode
Detail Information & Setting
(Navi will check internal function. connections, etc.
Perform this test with vehicle stopped and engine running.)
(Individual Diagnostic screens to confirma specific diagnostic screen.)
XM
Error
History
Yaw
Sensor Car Status
ECU Info. Hard Key
DVD Mic
HFL
Press any icon if you want to see details. GPS Ant. R. Camera
Display Radio
A/C
Return
ReturnError History
Hard Error Soft Error
Hard Error
Clear Save
0/0
1. 2705 HFL Diag
2004:12:31 - 19:15:55
2. 2707 Mic Diag 2004:12:31 - 19:15:50
2. 2707 GPS Diag:Antenna
2004:12:31 - 19:15:12
The Error History feature is to record intermittent
navigation issues that occur while using the system.
Sometimes the client complaint cannot be duplicated.
The error history may record the information needed to
diagnose the problem. To check the error history:
1. Start the engine.
2. Press and hold the MAP/GUIDE, MENU, and CANCEL buttons for 3 seconds.
3. When the Select Diagnosis Items menu is displayed, select Detail Information & Setting.
4. When the navigation unit has hard codes, the Error History icon appears yellow when the Self
Diagnosis mode (System links) screen is displ ayed.
When no hard errors are stored, the icon appears
gray. To view the errors with their DTC codes,
select the error history icon. 5. Select Hard Error.
NOTE: Soft errors are for factory use only.
6. The Hard Error screen displays the following information for each error:
 The DTC trouble code for the error
 A brief description of the DTC code
 The date and time when the error occurred.
NOTE:  To see additional errors, use the joystick to select UP or DOWN.
 Select Clear to delete the error history. The Save feature is for factory use only.
7. Use the DTC Symptom Troubleshooting table to troubleshoot the error.
8. Clear the DTCs.
9. Select Return to exit the error history.
Software errors are not available. They are for factory
use only.
(cont’d)
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(#'#
)
Overview
23-279
System Description
The navigation system is a highly sophisticated, hybrid locating system.
The navigation unit uses global positioning system (GPS) satellite signals, internal yaw and vehicle speed inputs, and
a map database to show where the vehicle is and to help guide you to a desired destination.
The navigation unit’s GPS receiver receives signals from the GPS, a network of 24 satellites in orbit ar ound the earth.
By receiving signals from several of these satellites, the navigation system can determine the latitude, l ongitude, and
elevation of the vehicle.
Signals from the system’s yaw rate sensor (inside the navigation unit) detects turns, and the ECM/PCM vehicle speed
pulse (VSP) and reverse signal enable the system to keep track of the vehicle’s speed and direction of travel. The
advantage of this hybrid system is that the system can track your position if either the GPS signal or the vehicle speed
signal is missing. For instance, when in a tunnel (no GPS), the speed signal is used to update your position on the map.
Alternately, while the vehicle is being transported on a ferry, GPS signals can show the vehicle position on the map as
it crosses the water.
The navigation system uses the location, direction, and speed information to display the appropriate map and
calculate a route to the destination entered. As you drive to a destination, the system provides both visual and audio
guidance. Audio guidance is sent to the audio unit, and an RGB graphics color signal is sent to the navigation display.
This navigation system also has voice recognition that allows voice control of most of the navigation, and audio
functions. The voice control switches (navigation TALK and navigation BACK buttons on the steering wheel) activate
the voice control system. The microphone on the ce iling receives your voice commands. For more information on this
feature, consult the navigation owner’s guide.
The illumination signal is used by the navigation unit to automatically switch the display mode between the Night and
Day display modes. When the headlights are on, the dash brightness control setting full brightness overrides the Night
display mode, and allows a daytime navigation display with the lights on.
When the navigation system is giving voice guidance commands, the front speakers are muted. When the voice
control system is being used (navigation TALK button pressed), all of the speakers are muted.
The internal GA-Net II bus passes information back and forth between the navigation display, the navigation unit, and
the audio system components. The information passed on this bus are touch button commands, audio muting signal,
audio (radio and XM), and any open in these bus lines can affect the navigation system or other audio accessory
operation.
The clock on the navigation display is set and maintained by the navigation unit. The time is automatically adjusted for
daylight savings, and time zone changes while driving. The time can be adjusted in setup.
Additional information is available about the navigation components following the System Diagram. A glossary of
terms that are used throughout this section follows the detailed information.
The Navigation System Manual in the glove box covers all of the system functions and settings. Use this as a resource
when evaluating a customer concern.
The Comm.Bus connects the HFL and the navigation unit.
If a POI phone number is available, the navigation unit sends the phone number (on the calcurate route to screen) to
the HandsFreeLink control unit for dialing.
(cont’d)
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Î
23-280Navigation System
System Description (cont’d)
Reverse signal
GPS antenna
AM/FM antenna Speakers
Navigation unit
Navi DVD
Navigation/Audio Display Screen
CLOCK
(Set by GPS)Color
signal
XM antenna
(satellite &
terrestrial)
Auxiliary jack
assembly
Audio remote
switches
(steering wheel)
Illumination
Signal
(lighted buttons)
AM/FM
receiverCD Player
(CD, MP3, WMA)
Audio
processor
PC Card Slot (for playing audio
MP3, and WMA audio files) Navi
processor
(ECU)
GPS
receiver
Yaw rate sensor
(senses turning)
DVD player
(navi maps)
GA-net
Audio
Section
Navigaion
Section
Illumination
(Night/Day
display mode)
ECM/PCM
(vehicle speed pulses) Voice control switch
USB Adapter unit
XM Receiver HandsFreeLink
control unitMicrophone
HFL TALK/BACK
buttons
Navigation
TALK/BACK
buttons
Stereo Amplifier
(Type S model)
Climate
control unit
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Î
Î
Navigation Function
Function Diagram
Vehicle Speed Pulse
23-281
STEERING BUTTONSHANDSFREELINK
CONTROL UNIT
AUDIO UNIT
LCD
SWITCH
Destination
DVD-ROM
YAW RATE SENSOR GPS tuning
GPS RECEIVER
NAVIGATION UNIT
GPS ANTENNA Reception of radio
wave from satellite
Data pcocess
concerning map
and vehivle position
Perception of
vehicle position
ECM/PCM
(VEHICLE SPEED PULSE)
Detection of
travel distansce Detection of
vehicle position
Detection of
direction change
Correction of
map matching
Map scroll
Change of reduced
scale of map Guide
processing Audio
guidance
NAVIGATION
DISPLAY
VOICE
PROMPTS
GA-Net bus
USB ADAPTER UNIT
XM RECEIVER MICROPHONE
Sensor power
NAVIGATION UNIT
ECM/PCM DISTANCE
DETECTION
CIRCUIT
The navigation system is composed of the navigation unit, the ECM/PCM (vehicle speed signal), the GPS antenna,
microphone, voice control switch, XM receiver, and the climate control unit.
These units communicate with each other on the GA-Net bus.
The vehicle speed pulse is sent by the ECM/PCM. The ECM/PCM receives a signal from the output shaft (countershaft)
speed sensor, then it processes the signal and transmits it to the speedometer and other systems.
(cont’d)
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ÎYaw Rate Sensor
Sensor Element Structure
Oscillation Gyro Principles
Operation
23-283
Enlarged view of sensor element
DETECTING PIEZOELECTRIC
PARTS
OSCILLATORS
SUPPORT PIN
DRIVING
PIEZOELECTRIC
PART
METAL BLOCK MONITORING PIEZOELECTRIC
PARTBend
Oscillation
Coriolis forceTurn to
right
Coriolis force
Oscillation
Sensor element top view
The yaw rate sensor (located in the navigation unit) 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 osc
illators, one to monitor and maintain the oscillation
at a regular frequency, and two to detect angular velocity. The two osc illators, 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 piezoelectric parts when they are bent by
an external force. The oscillation gyro functions 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 of 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 bends in proportion to the osc illation 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 osc illate 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 am ount 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)
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