Part Two
Navigation System Diagnostic Mode
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 satellites numbers shown on the diagram correspond to the PRN number in the GPS Details 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 GPS icon is white or not shown troubleshooting 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 10 seconds, a GPS Detail screen appears. This screen displays real time incoming satellite positional data. Most of information shown on this screen is for factory use, however some of the data can indicate partial GPS signal interference.
NOTE: The data shown is an example only.
- 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 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 PRN# on the circular GPS diagram (see prior screen).
NOTE: The table of values shown defines the terms at the top of the columns in the GPS Detail screen.
Yaw Rate
This diagnostic checks the yaw rate sensor in the navigation 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 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 Service and Repair.
- 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 vehicle turns while driving. If not, replace the navigation unit Service and Repair.
Example: Vehicle stopped
Example: Vehicle turning
- Sensitivity study represents the status of the internal tuning function. At initialization, this value starts at 6 and increases to 10 as the internal correction values become more accurate.
- Sensitivity study represents the status of the internal tuning function. At initialization, this value starts at 6 and increases to 10 as the internal correction values become more accurate.
- For detailed analysis of the yaw rate select tuning.
Yaw Rate Tuning
This diagnosis 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 diagnosis). When the sensor functions properly, the random changes in these two voltage 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.
Two tests are explained below. For large problems with the sensor values, the stationary test usually confirms whether the sensor is defective. For yaw rate issues related to driving, do the road test.
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 Service and Repair.
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.
If either test fails, please enter "Yaw rate sensor defective" for the problem description, on the Navigation core return form.
NOTE: The CCW, CW and Set buttons are disabled and cannot be activated.
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.
- Log Data
- GPS Send Time
- Demo Mode
- Mic Level
- Solar Angle
- Save Users Memory
Log Data
This screen allows the factory to collect log data to troubleshoot navigation system issues.
- You should only use the PC card slot to transfer user's data from an old navigation unit to a new one.
- Normally there is no card in the PC card slot, and the PC slot door should always be closed. The screen should appear as shown.
- However, if the factory provides a PC card for diagnostic purposes, and instructs you to insert it into the card slot (label side up), 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 the 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. The Speed Rate changes the speed of the demo mode.
Mic Level
This diagnosis screen allows you to independently test the microphone and the navigation TALK and navigation BACK buttons. They are used to activate the voice control system. The microphone is located near the map light in the ceiling. The microphone can now isolate the driver's voice even when there is noise or other conversations in the vehicle. To properly check the microphones, make sure you are sitting in the driver's seat.
- Press the navigation TALK button on the steering wheel, wait unit 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 Mic Level indicator on the screen does not briefly turn green, then check the wiring from the navigation 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 navigation unit.
- If the Mic Level bar is full or almost full without you speaking or other back ground noise, replace the microphone (ambient light) and recheck.
- Press the navigation BACK button on the steering wheel. This should cause the Cancel indicator on the screen to momentarily turn green. If it does not briefly turn green, then check the wiring from the steering wheel navigation BACK button to the navigation unit.
NOTE:
- The Mic Level indicator must reach the 6th bar or greater to pass the test.
- 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 navigation system 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 should not be adjusted.
- The screen shows a circular diagram of the sky oriented in the direction that the vehicle is pointing. During daylight hours a red dot is shown, representing the direction and elevation of the sun. The outer circle represents the horizon (0 degrees elevation). The middle circle is 30 degrees, the center circle is 60 degrees, and the very center is directly overhead (90 degrees).
- The Manual Tuning button should always be OFF.
- The Angle is the angle that the sun (shown with red dot) is above the horizon.
- The vehicle value represents the angle, clockwise 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.
Save Users Memory
When replacing the navigation unit, this function allows the technician to transfer the customer's personal data to the new navigation unit. The transferred information includes their setup settings, and personal addresses. The dealer inserts a PC card to the navigation unit, 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 PC card, and IMPORT moves the PC card files to the new navigation unit.
This function does not start (the EXPORT and IMPORT buttons are grayed out) until you insert a PC card.
Before starting this function, see the PC Card FAQs for information regarding PC cards, and the use of this function.
1. Select the EXPORT button to move the customer's data from the original navigation unit to the PC card. Select YES on the Export User Data Confirmation screen. The process takes only a couple of seconds. The system stores two files on the card.
NOTE: If the EXPORT button is grayed out, check the PC card's edge connector, and the pins inside the navigation unit (with a flashlight) for damage.
2. After installing the customer's original DVD in the new navigation unit, allow the system to boot up. Insert the PC card in the new navigation unit, and enter the Save Users Memory in the navigation system diagnostic mode.
3. Select IMPORT button to move the two files stored by the Export process from the PC card to the new navigation unit. Select YES on the Import User Data Confirmation screen. When the transfer is finished (a few seconds) the system will automatically reboot. After the system reboots, remove the PC card from the PC slot.
NOTE: If the IMPORT button is grayed out, check if the Model and the Program Flash shown on the Version screen are the same for the two (original and replacement) navigation units.
Version
This screen displays the current version of the program, and allows the loading of a new version of the program either from 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 SJC, 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 SJC 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.
There are two navigation DVDs produced for this model.
- The white navigation DVD labeled United States is for the US market and contains maps for the contiguous 48 US states, Hawaii, and some southern portions of Canada. Customers wanting additional northern coverage in Canada, can purchase a Canada, navigation DVD by contacting the DVD fulfillment desk.
- The gray navigation DVD labeled Canada, is for the Canada market, and contains maps for all of Canada, plus some of the northern US states. If customers with this navigation DVD require full US coverage (including states like Florida and Texas), they may purchase a United States navigation DVD by contacting the DVD fulfillment desk.
An older navigation DVD cannot be used in a navigation unit that is uploaded with newer software. You may see this error if you order a new navigation unit as it may arrive with a higher software version loaded into its memory.
You may also see this error if a customer inserted a newer navigation DVD into their unit. This is why it is never recommended that you show a customer a new navigation DVD by inserting it into their current vehicle. Once the newer software is uploaded, they will see an error message when they reinstall their original navigation DVD.
If you need to Download (install) an older software version into the navigation unit, do this:
1. Install the original navigation DVD from the original navigation unit into the new navigation unit.
2. Select DownLoad in the Version menu. The confirmation screen appears.
3. Select YES on the confirmation screen. The navigation system reboots.
4. After the navigation system reboots, go into the System Diagnostic Mode and select ECU Info. diagnosis, then select Mem Clear. The navigation system reboots.
NOTE: This step is necessary to delete all of the unwanted software version and to initialize the navigation ECU memory. Do not use Mem Clear except when doing this procedure.
5. Check that the navigation display shows the map properly.
PC Card FAQs
Error Message Table
