Unit Check

Unit Check
Select the item you want to check, and the test starts.
- Display
- Radio
- Navi ECU
- PC Card Info
- Hard Key




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, navigation display, audio unit, and CD changer connections. Next check for an open or short in the communication line between the navigation unit, navigation display, audio unit, and CD changer. If the line is found 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, "Close".




Radio
If the NG is indicated, check for loose audio unit connectors.




Navi ECU
This screen looks for problem with the navigation unit. When this diagnostic is initiated, there is a delay of up to a minute while it runs.
- If "V-RAM" or "D-RAM" is NG, then replace the navigation unit.
- If "GPS" indicates "NG (ANT)", then cheek 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 diagnostic reads OK, then order a new GPS antenna. If the diagnostic still reads NG (ANT), then replace the navigation unit.
- "DVD ROM" represents the database version on the DVD. This information can also be found on Setup by selecting System Information.
- "Serial No." should be the same as the serial number found on the underside of the navigation unit. This number is needed to obtain the security code from the Interactive Network (IN) system.
- Mem Clear 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 popup box is displayed 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 above screen.




Hard Key
This diagnostic checks the status of each of the hard buttons surrounding the navigation display. When each hard button is pressed, the corresponding item on the screen should flash "blue". Touch the return key, or press and hold the joystick to exit.

Car Status
This screen is used to confirm that navigation unit is properly receiving input signals. Signals equal to (0) are OFF, and signals equal to (Dare 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 8-Pin 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 taillight relay (Pin 5 of 8-Pin 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 optional rear view camera. This signal is needed because the Speed Pulse does not provide any directional information to the system.
- ILL CANCEL
a. OFF (0) when the gauge assembly brightness control is not set to maximum brightness.
b. ON 1. when the gauge assembly brightness knob is at full bright.

The illumination cancel signal comes from the A/C ECU. The A/C ECU gets the signal off of B-CAN from the gauge assembly and sends it to the Navi ECU using the communication between A/C and Navi (Pins 4,14, and 15 in the 20-Pin A navigation control unit connector.
- ILL-Illumination Indication (Pin 12 of navigation unit 20-Pin 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.