Part 2 of 2
F-CAN System Link
F-CAN (Fast Controller Area Network) passes information between processors on the network. For example, the F-CAN network is used to pass charging system or "illuminations cancel" signals. The F-CAN network uses a communication protocol that transmits data at 500 Kbps.
- If the diagnostic screen below reads NG with the ignition switch ON (II), you can use the HDS (HONDA Diagnostic System) to retrieve the diagnostic trouble codes (DTCs) from the F-CAN. The data displayed in the ID boxes is irrelevant.
- For more details on troubleshooting the F-CAN, refer to the multiplex system.
NOTE: If this is red "IF4", then the F-CAN link to the gauge control module may be malfunctioning. Troubleshoot in the F-CAN selection.
GPS Information
This screen shows the current status of GPS reception. The circular diagram shows the current location of the GPS satellites (yellow numbers) as they would appear in the sky. The outer circle represents the horizon (0 degrees elevation). The middle and inner circles represents 30 and 60 degrees respectively. The very center of the diagram (90 degrees elevation) is directly overhead. Nearby obstructions, like tall buildings, will block satellites in that direction. That is why it is necessary to troubleshoot GPS reception issues in an open area. The satellites shown on the diagram correspond to the "PRN" number in the "GPS Details" screen. There are always 24 "active" GPS satellites in orbit. Because satellites fail, and have to be removed from service, spares are always parked in orbit, ready to be activated. This is why the PRN (satellite ID number) can be greater than 24.
NOTE:
- To use this screen for troubleshooting, the vehicle should be outside, away from buildings, tall trees, and high- tension wires for at least 10 minutes with the engine running.
- Metallic window tinting on the front window or after-market electronic accessories mounted near the navigation unit, GPS antenna or navigation display can interfere with GPS acquisition.
- The "Number of Satellites" box shows the number of acquired satellites (maximum of 12). It should contain 3 or more icons. If not, troubleshoot for "GPS icon is white or not shown".
- The "Current Position" shows latitude, longitude, and elevation (in meters). If there are less than 4 satellites, the elevation can be grossly inaccurate.
- The Date/Time field shows the current date, and also a time that includes daylight savings and other offsets entered by the customer in Setup function "Adjust Time Zone/Clock".
NOTE:
Push and hold the "Map/Guide" button, and the "dots" on the diagram are replaced with the "PRN" # (satellite numbers). These numbers correspond to the numbers in the "PRN" column on the "GPS details" screen.
GPS Detail
By pressing and holding the MENU button for 10 seconds, a GPS Detail screen appears. This screen displays real time incoming satellite positional data. Most of the information shown on this screen Is for factory use, however, some of the data can indicate partial GPS signal interference.
- The box TS/AS and HDop/VDop is for factory use.
- The Speed and Direction information is updated in real time when driving, and can be used to detect intermittent speed sensor problems.
- The Date/Time Information is the same as in Setup screen 2 "Adjust Time Zone/Clock".
- If the "3D" icon is shown above the yellow dots, this implies that at least 4 satellites are available for map positioning, and the "GPS" indicator on the map screen will be green. See the Global Positioning System detailed explanation in the "System Description".
- If the row of data in the table below begins with a "yellow dot", the AZI and EL fields can be used to locate each satellite "PRN" # on the circular GPS diagram (see prior screen).
NOTE: The data shown in the GPS Detail screen is an example only.
Yaw Rate
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".
- "Sensor" indicates the voltage output from the yaw rate sensor. It should indicate about 2.500 V when stopped.
- "Offset" is the reference voltage or standard within the yaw rate sensor. It also should indicate about 2.500 V when 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 stopped. If either reads zero or 5.000 V, replace the navigation control unit.
- The yaw rate offset and sensor should be within +/- 0.01 V of each other when stopped. The sensor value should change relative to the offset as the car is turned while driving. If not, replace the navigation unit.
Example Vehicle stopped
Normal
Offset 2. 526 V
Sensor 2.516- 2.536 V
Abnormal
Offset 2. 526 V
Sensor 2. 623 V
Example Vehicle turning
Normal
Offset 2.526 V
Sensor 2.678 V (left turn) 2.478 V right turn)
Abnormal
Offset 2.526 V
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 American Honda. See the Yaw Rate Tuning subsection to tune the sensor.
Yaw Rate 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 is working, 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 gross problems with the sensor, the stationary test usually confirms whether the sensor is defective. For yaw rate issues related to driving, do the road test described below.
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 control 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 control unit's yaw sensor is defective. You can touch "Reset" to clear "ANG-Disp", and the dotted line.
3. If either test fails, please enter "Yaw rate sensor defective" for the problem description, on the "Navigation core return form".
Tire Calibrate
As the vehicle moves, the navigation system receives speed pulses from the 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.
Functional Setup
Select the item you want to check.
- Lag Data
- GPS Send Time
- Demo Mode
- Mic Level
- Solar Angle
Log Data
This screen allows the factory to collect log data to troubleshoot navigation system issues.
- There is no card in the "PC Card Slot", and the PC slot door should always be closed. The screen should appear as shown below.
- However, if the factory provides a PC card, insert it into the1 card slot (label side up), and then slide the PC Card dc)or shut. If instructed by the factory, select "Gyro. Sensor Logs ON". Follow the factory procedure for gathering test data, and properly ending the test.
GPS Send Time
This screen is for factory use only. It allows adjustment of the GPS time. This display updates in real time.
- "GPS Time" is the time as received from the GPS satellites. It is in Greenwich Mean Time (GMT).
- "System Time" is the internal time used by the navigation unit to calculate your position on the map. It is also in Greenwich Mean Time (GMT).
- "Display Time" is the time shown on Setup screen 2 "Adjust Time Zone/Clock", and reflects any changes due to daylight savings time or time adjustments entered by the customer.
- Date, Hour, Minute, and "Set" should not be used.
Demo Mode
This screen is for factory use only, and should always be set to "OFF". Occasionally this setting is turned "ON" when vehicles are being used at Auto Shows or similar events. Turning this feature on, allows the navigation system to automatically follow a route to a destination when the vehicle is stationary.
Mic Level
This diagnostic allows you to independently test the microphone, the TALK and BACK buttons. They are used to activate the voice control system. The microphone is located near the map light in the ceiling. It is directional, and works best if the voice is coming from the drivers seat.
- Press the TALK button on the steering wheel, and in a normal voice say "testing". The TALK indicator on the screen should momentarily turn green, and the text "Now Recording..." should appear yellow. If the Mic Level indicator on the screen does not briefly turn green, then check the wiring from the TALK button to the navigation unit. If there is no "Mic Level" movement when you speak, then you should check the wire running from the microphone to the control unit.
- Press the BACK button on the steering wheel. This should cause the Cancel indicator on the screen to momentarily turn green. If it does not briefly change to green, then check the wiring from the steering wheel BACK button to the navigation unit.
- The mic level should reach at least the 6th bar.
NOTE: If the radio is off, and there is movement in the indicator- even without speaking, then ensure that the vents are not blowing on the microphone.
This should resolve voice control complaints such as
- Sometimes the system does not understand my commands.
- I have to shout at the navi for a command to be recognized.
- The system just says "pardon"
Solar angle
This screen graphically displays the sun's position as determined by GPS. The climate control uses the sun's angle, along with the sunlight sensor to control the driver/passenger A/C air flow. The heat that the A/C unit removes varies, depending on the angle of the sun entering the vehicle.
This screen is for factory use only, and allows simulation of this feature for development purposes.
- The "manual tuning" button should always be "OFF"
- The "Angle" is the angle that the sun (shown with the red "dot") is above the horizon.
- The "vehicle" value represents the angle, clockwise from North, to the direction that the vehicle position (VP) icon is pointing (always points straight up).
- The "direction" value is the angle, measured clockwise from the VP (straight up) to the suns position.
- The reliability ranges from 1 to 3, and represents the accuracy of the Vehicle Position relative to the sun.
Version
This screen displays the current version of the program, and allow the loading of a new version of the program from either a CD/DVD or from a PC card.
The Program Flash version should always be greater than or equal to the Program Disc version. IPL, APL, DBOOT, and system uCom are for factory use only.
The Model code is S9VX, and is for factory use only. This code is stored on a chip in the navigation unit. Therefore every model has a unique part number for the navigation unit.
NOTE: If any model number other than S9VX is displayed, replace the navigation unit with the correct part. The model code tells the navigation unit what software to load off the DVD.
Do not use Download, unless instructed to do so by the factory.
Error Message Table