Part 2
Navigation System Diagnostic Mode
USB Memory Info
This diagnosis displays the USB device status that is connected to the audio-navigation unit.
If the USB memory device is connected to the USB port, the screen displays the USB memory size, the Product ID, Vender ID, and connection status (Inserted/Not Inserted).
When you select Files, the USB device file information is displayed.
Navi ECU
This diagnosis looks for problems in the navigation ECU. When you start this diagnosis, the audio-navigation unit may freeze or delay up to a minute while the diagnosis runs.
- Displays the result of the access to the DRAM (OK/NG). If DRAM shows NG, replace the audio-navigation unit Audio-Navigation Unit Removal/Installation.
- Program Version: Displays the version of the navigation software.
- Model: For this model, the field should begin with TM8.
- Serial No. : Displays the audio-navigation unit serial number. That should be the same as the serial number found on the upper side of the audio-navigation unit.
- Flash: Displays the result of the access to the flash memory (OK/NG). If it is NG, replace the audio-navigation unit Audio-Navigation Unit Removal/Installation.
HFL
This diagnosis checks first whether the HandsFreeLink control unit is connecting to the audio-navigation unit via the GA-Net. If the HFL and GA-NET shows NG, go to HandsFreeLink control unit Input Test Service and Repair. Then checking the HandsFreeLink control unit status. If the HFL shows B1792, go to HFL DTC B1792 troubleshooting B1792.
GPS Antenna
This diagnosis tests the GPS antenna connection. If Antenna shows NG, the GPS antenna may have failed. Check for the navigation DTCs.
Select Information to see the GPS satellite details.
Radio
This diagnosis displays the internal radio tuner and the CD player status. If Connection shows NG, replace the audio-navigation unit Audio-Navigation Unit Removal/Installation.
- Electric Field Intensity: Displays radio reception sensitivity (dBuV).
- CD Mech. Version: Displays the version of the internal CD player.
Car Status
Use this screen to confirm that the audio-navigation unit is properly receiving input signals. Signals equal to (0) are OFF, and signals equal to (1) are ON. If the value on the display does not match the actual vehicle status, then check the wire carrying the signal.
- VSP-Vehicle Speed Pulse from the PCM (audio-navigation unit connector A (24P) terminal No. 15)
a) OFF (0) when the vehicle is not moving
b) ON (1) when the vehicle is moving
The VSP comes from the PCM as a dedicated signal. Internally, the audio-navigation unit compares the actual VP on the map against street data to adjust the pulse to speed scaling factor. As this scaling factor becomes more accurate, the Level gradually increases from 0 to 10 (see the Tire Calibrate diagnostic screen).
- BACK-Reverse indication from taillight relay (audio-navigation unit connector D (20P) terminal No. 2)
a) OFF (0) when the shift lever is in any position other than reverse
b) ON (1) when the shift lever is in reverse
The Back signal is used by the audio-navigation unit to allow the map screen to show the VP moving backwards when in reverse. This signal is needed because the Speed Pulse does not indicate direction.
- ILL-Illumination Indication (audio-navigation unit connector A (24P) terminal No. 13)
a) OFF (0) when parking lights, or headlights are off
b) ON (1) when parking lights, or headlights are on
The navigation uses the signal to determine whether to put the navigation screen into the Day or Night brightness mode (Setup screen 1).
- ILL CANCEL
a) OFF (0) when the dashlights brightness control button is less than 90 % brightness with the headlights turned on.
b) ON (1) when the dashlights brightness control button is more than 90 % brightness with the headlights turned on.
Version
This screen displays the current version information for the navigation system. DBOOT (NOR-FLROM) and System u-Com are all for factory use.
- Navi Application (DRAM): Displays the version of the navigation software.
- DBOOT and System uCom are all for factory use.
- Map Data: Displays the version of the map data.
- Download: Do not touch, unless instructed by the factory.
F-CAN
F-CAN (Fast Controller Area Network) passes information between processors on the network. For example, the F-CAN network passes trip computer information between the gauge and the audio-navigation unit for the trip computer function.
The F-CAN network uses a communication protocol that transmits data at 500 Kbps.
- This diagnosis must have the engine running.
- If F-CAN shows ERROR ACTIVE, an error is not detected between F-CAN bus and the audio-navigation unit. If any error is detected, check for diagnostic trouble codes (DTCs) for the F-CAN with the HDS (Honda Diagnostic System). The data displayed in the ID boxes is for factory use only.
Log Data
This screen allows the factory to collect log data to troubleshoot navigation system issues.
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 be in an open area to effectively troubleshoot GPS reception issues. The satellite numbers shown on the diagram correspond to the PRN number in the GPS Detail screen. There are always at least 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: When you use this screen for troubleshooting, park the vehicle outside, away from buildings, tall trees, and high-tension wires for at least 10 minutes with the engine running.
- The Number of Satellites box shows the number of acquired satellites (maximum of 12). It should contain three or more icons. If not, go to for GPS icon is white or not shown Symptom Troubleshooting.
- The Current Position shows latitude, longitude, and elevation (in feet). If there are less than four 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 screen 2 Adjust Time Zone/Clock.
NOTE: Pressing the map/guide button displays the satellite number on each circle.
GPS Detail
By pressing and holding the MENU button for 2 seconds, a GPS Detail screen appears. This screen displays real time incoming satellite positional data when the vehicle is outside in the open. The information shown on this screen is for factory use.
NOTE: The data shown is an example only.
- The box TS/AS and H Dop/V Dop is for factory use.
- The Speed and Direction information is updated in real time when driving.
- 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 four 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 on the circular GPS diagram (see prior screen).
NOTE: The table of values defines the terms at the top of the columns in the GPS Detail screen.
Yaw Sensor
This diagnosis checks the gyro in the audio-navigation unit. This device detects when the vehicle turns, and repositions the vehicle position icon on the map screen.
- Sensor: Indicates the voltage output from the gyro. It should indicate about 2.300 V-2.700 V when the vehicle is stopped.
- Offset: Indicates the reference voltage or standard within the gyro. It also should indicate about 2.300 V-2.700 V when the vehicle is stopped.
- A sensor output voltage HIGHER than the Offset voltage indicates that the vehicle is turning to the right.
A sensor output voltage LOWER than the Offset voltage indicates that the vehicle is turning to the left.
- The Offset and Sensor should both indicate about 2.300 V-2.700 V when the vehicle is stopped. If either reads below 2.300 V, or above 2.700 V, replace the audio-navigation unit Audio-Navigation Unit Removal/Installation.
- The 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 audio-navigation unit Audio-Navigation Unit Removal/Installation.
- Auto Tuning: For factory use only. This setting should be ON.
- Learning Level: Displays the status of the internal tuning function. At initialization, this value starts at 0 and increases to 10 as the internal correction values become more accurate.
- CCW Factor, CW Factor: For factory use only.
- Gyro AD: Displays the result of the AD value (OK/NG). If NG, check for navigation DTCs.
- Gyro Zero: Displays the result of the zero point output voltage (OK/NG). If NG, check for navigation DTCs.
Error History
Refer to How to Check for Error History to use this diagnosis.
Functional Setup
- Mic Level
- Demo Mode
- Save Users Memory
- All Clear
Mic Level
This diagnosis allows you to independently test the microphone and the HFL-navigation voice control switch. The TALK button is used to activate the voice control system. The microphone is located near the map light in the roof console. The microphones can now isolate the driver's voice even when there is noise or other conversations in the vehicle. To properly check the microphone, make sure you are sitting in the driver's seat.
This diagnosis checks whether the microphone and the HFL-voice control switch are connecting to the HandsFreeLink control unit. If Mic and/or STRG SW shows HFL DTCs (B1775, B1776, B1779, and/or B1780), go to indicated HFL DTC troubleshooting.
Press the navigation TALK button on the steering wheel, wait until you hear a beep, and in a normal voice say "testing". The TALK indicator on the screen should momentarily turn green, and the text "Now Recording..." should appear in yellow. If the talk indicator shown on the screen does not briefly turn green, check the wiring from the steering wheel navigation TALK button to the audio-navigation unit. If there is no Mic Level movement when you speak, then you should check the wires running from the microphone to the HandsFreeLink control unit and the audio-navigation unit. If the wires are OK, the microphone must be faulty; replace the microphone.
Demo Mode
This screen is for factory use only, and should always be set to OFF. Occasionally DEMO 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. Speed changes the speed of the demo mode.
Save Users Memory
NOTE: If the audio-navigation unit SD module is OK, transfer the SD module to the new audio-navigation unit. Do this procedure only when replacing the SD module (if possible). If the SD module is NG, it is unlikely you will be able to recover any information.
When replacing the audio-navigation unit, this function allows the technician to transfer the customer's personal data to the new audio-navigation unit. The transferred information includes their setup settings and personal addresses. The dealer inserts a USB device into the USB port, and then selects the Save Users Memory function. The two functions in this diagnostic screen are Export and Import. Export saves the customer's data to the USB device, and Import moves the USB device files to the new audio-navigation unit.
This function does not start (the Export and Import buttons are grayed out) until you connect a USB device to the USB port.
1. Select Export button to move the customer's data from the original audio-navigation unit to the USB device. Select YES on the Export User Data Confirmation screen. The process takes only a couple of seconds. The system stores .DAT files on the USB device.
NOTE: If the Export button is grayed out, check the USB port.
2. After replacing the new audio-navigation unit, allow the system to boot up. Insert the USB device into the USB port and enter the Save Users Memory in the navigation system diagnostic mode.
3. Select the Import button to move the two files stored by the Export process from the USB device to the new audio-navigation unit. Select YES on the Import User Data Confirmation screen. When the transfer is finished (a few seconds) the system automatically reboots. After the system reboots, remove the USB device from the USB port.
NOTE: If the Import button is grayed out, check if the Model and the Program Version shown on the Navi ECU screen are the same.
All Clear
The all clear function deletes the all the ripped music, the images, and the previous destinations from the audio-navigation unit SD module.
If you select All Clear, a confirmation screen appears. When Yes is selected, a second confirmation screen appears.
When Yes is selected, the system restarts after performing the All Clear process. After the restart, a normal start-up process occurs and needs GPS initialization.
USB
This diagnosis displays directly from the System Links screen by selecting the USB icon. This diagnosis checks the connection about USB harness.
If Connection shows NG, check for open in the wire between audio-navigation unit connector F (7P) terminals No. 6 (USB DET) and No. 7 (USB DET GND).
Flash Memory
This diagnosis displays directly from the System Links screen by selecting the Flash Memory icon.
This diagnosis checks the SD module status.
- Insert: Displays the result of the insert status about the SD module (OK; Inserted, NG; Not Inserted).
- Access: Displays the result of the access to the SD module (OK/NG). If NG, replace the SD module SD Module Removal/Installation, and recheck.
Error Message Table
