Unit Check

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




Display
This performs additional checks on the communication bus between the control unit and the display. In addition, the internal electronics and touch screen functionality are confirmed.
- When the connection is NG, first check for loose terminals at the navigation unit and the navigation display connections. Next check for an open or short in the communication line between the navigation unit and the navigation display. If you find the line to have an open or short, replace the affected shielded harness.
- If the ROM or RAM is NG, replace the navigation display.
- The version represents the software version in the display.
- Six CD connection checks the status of the connection between the CD changer and the audio unit. An NG represents an open in that circuit.
- Display Lid indicates if the front display panel is Open or Closed. This should always say, "Closed".




Radio
If the NG is indicated, check for loose audio unit connectors: If not OK, do the troubleshooting for the audio system.




Navi ECU
This screen looks for problems with the navigation unit. When you initiate this diagnosis, the navigation unit may delay up to a minute while the diagnosis runs.
- If "V-RAM" or "D-RAM" is NG, then replace the navigation unit.
- If "GPS" indicates "NG (ANT)", then check the entire GPS antenna wire from the navigation unit to the antenna. If the wire is crushed or damaged, try a known good antenna. If this diagnosis reads OK, then replace the GPS antenna. If the diagnosis still reads NG (ANT), then replace the navigation unit.
- "DVD ROM" represents the database version on the DVD. You can also find this information in Setup Screen 4 by selecting System Information.
- "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.
- Mem Clr is for factory use, and should never be used unless instructed by the factory. Accidental selection will erase the customer's personal data, PINS, and settings. If selected, a pop-up box appears asking if you want to clear the memory. If so, select "Yes".




PC Card info
There is no PC Card in the PC slot, and the screen should say, "PC Card is not inserted". Do not insert any card or object into the slot.




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




Hard Key
This diagnosis checks the status of each of the hard buttons surrounding the navigation display. When you press each hard button, the corresponding item on the screen should flash "blue". Touch the return key to exit.

Car Status
Use this screen to confirm that 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 PCM
(Pin 6 of navigation unit C-connector)
a) OFF (0) when vehicle is not moving
b) ON (1) when vehicle is moving

The VSP comes from the PCM as a dedicated signal. Internally, the 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.

- BACK-Reverse indication from multiplex integrated control unit (Pin 5 of navigation unit C-connector)
a) OFF (0) when shift lever is in any position other than reverse
b) ON (1) when shift lever is in reverse

The Back signal is used by the navigation unit to allow the map screen to show the VP moving backwards when in reverse and to trigger the back-up camera. This signal is needed because the Speed Pulse does not provide any directional information to the system.

- ILL-Illumination Indication
(Pin 5 of navigation unit A-connector)
a) OFF (0) when parking lights, or headlights are off
b) ON (1) when parking lights, or headlights are on

This signal is used by the navigation unit to determine whether to put the navigation screen into the Day or Night brightness mode. (Setup screen 1)

- DVD Lid-senses if DVD door is open
a) (Close) when door is closed
b) (Open) when door is open

The navigation unit has a microswitch to detect this. If open is indicated when the door is closed, replace the navigation unit.

- ILL CANCEL
a) OFF (0) when dash brightness is not set to maximum brightness
b) ON (1) when headlights are on, but dash brightness is set to max brightness




This item detects whether the "illumination cancel" function is in use. The illumination cancel function is activated by rotating the dash brightness knob fully clockwise when the headlights are on. The signal is passed by B-CAN to the climate control ECU. From there the signal travels to the navigation unit on the climate "UART" bus.