2006 ACURA CSX sensor

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General Operation
Anti-theft Feature
Symptom DiagnosisSelf-Inertial Navigation Limitations
23-90Navigation System
General Troubleshooting Information
Refer to the Navigation System manual for the
navigation system operating procedures.
The navigation system has a coded theft protection
circuit. Be sure you have the client’s anti-theft security
code before;
 Disconnecting the battery
 Disconnecting the navigation unit A (17P) and C (12P) connector
 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 ON (II). Enter the 4-digit
anti-theft security codes, 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 Navi ECU diagnostic screen (see page 23-139).
Alternatively, you can find the serial number from the
navigation unit in the dash.
When replacing the navigation unit, be sure to give the
client the new anti-theft security code.
Certain circumstances and system limitations can result
in occasional vehicle positioning errors. Some clients
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 clients
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 some discrepancies between
the vehicle’s actual position and the indicated vehicle
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.
 Tolerances in the system and map inaccuracies will sometimes limit how precisely the vehicle 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 direction to destination icon or the destination icon shown or the map may be up to several
hundred feet away from the actual location.
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Overview
23-101
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 client concern.
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23-102Navigation 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)
Stereo Amplifier
(Premium sound
system)
Color
signal
Accessory
(MusicLink,
CD changer, etc.)
XM Receiver
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
Audio
Section
Navigaion
Section
Illumination
(Night/Day
display mode)
ECM/PCM
(vehicle speed pulses) Microphone
(on ceiling) TALK/BACK
voice buttons
(’08 model) Climate control unit
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Navigation Function
Function Diagram
Vehicle Speed Pulse
23-103
STEERING BUTTONS MICROPHONE
GA Net bus AUDIO UNIT
LCD
SWITCH
Destination
DVD ROM
YAW RATE SENSOR GPS tuning
GPS RECEIVER
NAVIGATION UNIT
XM RECEIVER 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
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, the
microphone, the voice control switch, the 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 countershaft speed sensor,
then it processes the signal, and transmits it to the speedometer and other systems.
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ÎYaw Rate Sensor
Sensor Element Structure
Oscillation Gyro Principles
Operation
23-105
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.
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Navigation Unit
Calculation of Vehicle Position
Map Matching Tuning
GPS Tuning
Distance Tuning
Route Guidance
Audio Guidance
DVD-ROM
23-107
The navigation unit calculates the vehicle position and guides you to the destination. The unit performs map matching
correction, GPS correction, and distance tuning. It also controls the menu functions and the DVD-ROM drive, and
interprets voice commands. With control of all these items, the navigation unit makes the navigation picture signal,
then it transmits the signal to the navigation display and audio driving instructions to the audio unit.
The navigation unit calculates the vehicle position (the driving direction and the current position) by receiving the
directional change signals from the yaw rate sensor and the travel distance signals from the PCMs vehicle speed pulse
(VSP) signal.
The map matching tuning is accomplished by indicating the vehicle position on the roads on the map. The map data
transmitted from the DVD-ROM is checked against the vehicle position data, and the vehicle position is indicated on
the nearest road. Map matching tuning does not occur when the vehicle travels on a road not shown on the map, or
when the vehicle position is far away from a road on the map.
The GPS tuning is accomplished by indicating the vehicle position as the GPS’s vehicle position. The navigation unit
compares its calculated vehicle position data with the GPS vehicle position data. If there is large difference between
the two, the indicated vehicle position is adjusted to the GPS vehicle position.
The distance tuning reduces the difference between the travel distance signal from the VSP and the distance data on
the map. The navigation unit compares its calculated vehicle position data with the GPS vehicle position data. The
navigation unit then decreases the tuning value when the vehicle position is always ahead of the GPS vehicle position,
and it increases the tuning value when the vehicle position is always behind the GPS vehicle position.
The navigation unit can calculate different routes to a selected destination. You have five options:
 Direct Route Calculate a route that is the most direct.
 Easy Route Calculate a route that minimizes the number of turns needed.
 Minimize Freeways Calculate a route that avoids freeway travel. If that is not possible, keep the am ount of
freeway travel to a minimum.
 Minimize Toll Roads Calculate a route that avoids, or minimizes travel on toll roads.
 Maximize Freeways Calculate a route that uses freeways as much as possible.
The navigation unit transmits audio driving instructions before entering an intersection or passing a junction.
The audio instructions come through the audio unit to the front speakers.
NOTE: The front speakers are muted whenever the navigation system is giving guidance commands, and all of the
speakers are muted when the voice control system is being used.
The map data (including all scale rates) is stored in the DVD-ROM. The map data includes:  Road distances, road widths, speed limits, traffic regulations, passing time at junction, distances to junctions, and the driving instructions for audio guidance.
 Latitude and longitude GPS.
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ÎAudio Unit (Built in the navigation unit)
Navigation Display
Microphone
Navigation TALK Button
Navigation BACK Button
23-108Navigation System
System Description (cont’d)
The audio unit receives the audio driving instructions from the navigation unit, and transmits the instructions through
the front speakers even when the audio system is in use.
The navigation display uses liquid crystal display (LCD). The LCD is a 6.5-inch-diagonal, thin film transistor (TFT),
stripe type with 65,536 color, The color film and fluorescent light are laid out on the back of the liquid crystal film. The
touch sensor on the front of the LCD consists of a touch sensitive resistive membrane with an infinite number of
possible touch locations.
The microphone (on the ceiling, near the front map light) receives voice commands and transmits them to the
navigation unit for interpretation.
Activates the voice control system in the navigation unit to accept voice commands.
Returns the display to the previous screen (similar function as the CANCEL button).
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Glossary
Item Definition
23-109
The following is a glossary of terms pertaining to the Voice Recognition Navigation System.Active noise cancellation
(ANC) The active noise cancellation system cancels some of the vehicle noise. This occurs in the 1,500 2,400 rpm
range. Microphones detect the low frequency sound, and the system outputs a canceling sound from the audio
speaker.
Address Book The HFL system can import a copy of the phone book from and approved HFL compatible phone and display the imported phone book on the navigation screen as the address book. See the Owner’s Manual for more
information.
B-CAN Body CAN Bus (see CAN)
Bread-crumbs (White
dots) Off road tracking dots that can be followed on the map to retrace your route back to a mapped (digitized) road.
This function can be turned on/off in Setup screen 1.
CAN Controller Area Network. This communication network allows processors in the vehicle to send/receive information. The fuel pulses used by the MID trip computer are received from the ECM/PCM using the F-CAN
(Fast Controller Area Network) bus.
CPU Central Processing Unit. The main device within the navigation unit that coordinates the rest of the electronic functions.
CSS Countershaft (Output) Speed Sensor. This sensor reads the output shaft speed at the transmission and provides a speed pulse to the ECM/PCM.
Database This consists of the Map data, and the POI (Points Of Interest) data stored on the DVD.
DBW Drive By Wire. Allows electrical control of the throttle without the need of a mechanical linkage.
DCA Detailed Coverage Area. Main metropolitan areas in the Lower 48 states, and Canada are mapped to this level. See the navigation system manual for a list of these areas.
DTC DTC Diagnostic Trouble Codes. Use HDS tablet to obtain, and troubleshoot the cause of these codes.
Dead reckoning The use of the speed signal, and yaw rate sensor to position the vehicle on the map even when tall buildings, or driving in a tunnel obscures the GPS signal.
Digitized road A road that appears on the navigation screen. The road name appears at the bottom of the navigation screen. If the user drives off road, the navigation system displays not on a digitized road, and after 1/2 mile, the bread-
crumbs appear.
Disclaimer screen Screen containing cautionary information. It is meant to be read carefully and acknowledged by the customer when using the navigation system.
DVD or DVD-ROM Digital Versatile Disk. The navigation program and database resides on this disk. See the Navigation Owner’s Manual for information on how to order a replacement or an update DVD.
ECM Engine Control Module. Typically referred to as the ECM.
FAQ Frequently Asked Questions. See the navigation system manual for a list of the customer FAQs, and troubleshooting information.
F-CAN Fast CAN Bus (see CAN)
GA-NET The GA-NET allows the audio unit to communicate with all the audio and navigation components in a vehicle. If there is an open in the GA-NET, components or the entire audio and navigation system may appear inoperative.
GPS Global Positioning System. A network of 24 satellites in orbit around the earth. The navigation system can simultaneously receive signals from up to 12 satellites to accurately position the vehicle on the map.
HDS Honda Diagnostic System. A hand held tablet PC used for diagnosing vehicle problems. This device can be used to obtain DTC codes for diagnosis of the navigation system and CAN related problems.
HFL HandsFreeLink uses Bluetooth technology as a wireless link between it and an approved Bluetooth compatible cell phone. See the vehicle Owner’s manual or Quick Start Guide for more information.
HIP (AcuraLink) Honda Information Platform (see AcuraLink)
H/U Head Unit. The audio unit in the dash.
Initialization This refers to the period needed to re-acquire the GPS satellite orbital information whenever the navigation system power has been disconnected. This can take from 10 to 45 minutes.
Interface Dial This control device consists of a rotating knob and the buttons surrounding it. This device allows control of the navigation, audio, and climate functions displayed on the screen.
Jog Dial See interface dial.
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