Part 2

Monitor Check

Overview of navigation display unit

- The navigation display unit communicates with the navigation unit over its own GA-Net bus. Information sent by the navigation unit to the navigation display unit includes commands to control the LCD back light.
- The security system protects the navigation display unit by daisy-chaining the security signal through it, and then passing the signal to the audio unit.
- The illumination input from the gauge brightness control provides back lighting for the buttons surrounding the screen.

These screens allow you to troubleshoot the navigation display unit. Select the item you want to troubleshoot, and follow the diagnostic instructions.





RGB Color

This screen verifies that the display unit is receiving the video (R, G, B and Composite sync) signals properly. The three primary colors should all appear without distortion. The combination of all three should produce a central white section. If any of the colors are missing, troubleshoot for the color signal Symptom Troubleshooting. If the picture has lines in it or scrolls horizontally, or vertically, troubleshoot for a Composite sync problem Symptom Troubleshooting.





Gray Tone

This screen diagnoses problems with contrast. You should be able to see the changes from bar to bar across the scale. It is normal for the two bars on either side to appear the same. If you can't see changes from bar to bar, replace the navigation display unit Service and Repair.





Black Raster

This diagnostic screen checks for pixels that may be stuck on. The entire display must be black. If pixels are stuck on, replace the navigation display unit Service and Repair.





Color Pattern

The chart below shows the colors being used for the map and menu screens. This is for factory use only. To check the color signal, use the RGB Color diagnostic found under the Monitor Check.





White Raster

This diagnostic screen checks for pixels that may be dead (off). The entire display must be white. If there are dead pixels, replace the navigation display unit Service and Repair.





Monitor Adjustment

This allows you to center the navigation display. Use the joystick to move the picture up/down or left/right. It is unlikely that you will ever need to adjust the monitor position. The Default button will reset the display position to factory specifications.






Unit Check (Quick Check)

Some of the tests and screens that are displayed under the Unit Check are different from the other detailed checks.

To start the test, select the item you want to check starts.

- Display
- Radio
- GPS
- ECU Info.
- Aircon
- Smart Card
- XM (Canada models)
- PC Card Info.
- Hard Key
- Yaw Sensor
- DVD
- Rear Camera
- HFL

USA and Hawaiian models





Canada models





Display

This diagnostic does additional checks on the communication bus between the control unit and the display. This test also checks the internal electronic functions.

- When the connection is NG, first check for loose terminals at the navigation unit and the navigation display unit connections. Next check for an open or short in the communication line between the navigation unit and the navigation display unit. If you find the line has an open or a short, replace the affected shielded harness.
- If the ROM or RAM is NG, replace the navigation display unit Service and Repair.
- The version represents the software version in the display.





Radio

This diagnosis checks the audio unit internal radio tuner and CD/DVD player. If connection is NG, replace the audio unit Audio Unit Removal / Installation.

NOTE: If the XM link appears red, but the radio link appears green in the navigation System Links, refer to audio system symptom troubleshooting.





GPS

This diagnosis tests the GPS antenna connection and the GPS receiver condition.

- In the GPS menu, if the Antenna indicates NG, then check the entire GPS antenna wire from the navigation unit to the antenna only. If the wire is crushed or damaged, try a known-good antenna. If the diagnostic then reads OK, replace the original GPS antenna Service and Repair. If the diagnostic still reads NG (ANT), replace the navigation unit Service and Repair.
- Select information to see the GPS satellite details.





ECU Info.

This screen looks for problems in the navigation unit. When you initiate this diagnosis, the navigation unit may freeze or delay up to a minute while the diagnosis runs.

NOTE: Do not try to end this diagnostic by pressing OK or Mem clear before it finishes, otherwise the system may reboot.

- If V-RAM or D-RAM is NG, replace the navigation unit Service and Repair.
- DVD lid displays the state of DVD Lid of navigation unit.
- Program Flash: Displays the version of the navigation software in memory.
- Program on DVD: If displayed, this value represents the version of the navigation software on the navigation DVD.
- DVD version represents the database version on the DVD. You can find this information in either the Setup Screen Version, or in the Diagnostic Screen Version.
- Serial No. should be the same as the serial number found on the underside of the navigation unit. You need this number to obtain the security code from the Interactive Network (iN) system.
- The Mem Clr is for factory use and should not be used unless instructed by the factory.
Selecting this will clear the client's settings, personal information, GPS orbital data, and anything else stored in memory.





Aircon

This diagnostic tests the climate bus connection (AC-SI and AC-SO) between the navigation unit and the climate control unit. This test does not check the system components, only the connections. Make sure the engine is running for this test.

NOTE: It this test is run with the ignition switch in ACCESSORY (I), the result will be NG.





Smart Card

If the remotes are linked to the vehicle, you can check the remote card condition on the this screen.





XM (Canada models)

- This checks the GA-NET bus line to the XM receiver.
- When connection is shown with NG, check the connection between the XM receiver and the audio unit.





PC Card info.

There is no PC Card in the PC slot, and the screen should display, "PC Card is not inserted".

NOTE: Do not insert any card or object into the slot.





If the factory provides a PC card and instructs you to insert it, the screen displays the Manufacturer and Product Name as shown in the following screen.





Hard Key

This diagnostic tests the interface dial, and buttons that surround it. For this model, the interface dial and buttons do not use the GA-Net bus for communications.

To complete the test, touch each button on the vehicle's control panel, and move the interface dial to each indicated position. As each function is tested, the corresponding button on the display should highlight.

To exit, push in and hold the selector knob.

NOTE: You cannot use the onscreen return button to exit this function.





Yaw Sensor

This screen gives a quick test of the yaw sensor functionality based on the two voltages Sensor and Offset. For more information, see the Yaw Rate Diagnostic.





DVD

This diagnostic tests the navigation DVD reader.





Rear Camera

- This tests whether rearview camera is connected to the navigation unit.
- When connection is shown NG, check the rearview camera signal line.





HFL

This checks the 4 wire communication bus between the HandsFreeLink control unit and the navigation unit. This test does not check the system components, only the connections.