Driver Interface Unit
The driver interface unit (DIU) provides visual and audible alerts, along with system status information. The DIU also provides an interface for changing system settings. Menu selections are made by pressing the up and down arrow buttons, and the OK button. See Fig..
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Fault Indicator
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Info Indicator
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Following Distance Lights
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Ambient Light Sensor
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Collision Alert Lights
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User Interface Keypad
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Graphic Display
Fig. 1, Driver Interface Unit (DIU)
The following warning and indicator lights illuminate on the DIU:
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Red: illuminates with the collision alert
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Yellow: illuminates with 3-, 2-, and 1-second following distance alerts
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Orange: illuminates when a system failure occurs
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Blue: illuminates when information is available
Immediately after the ignition switch is turned to ON, the DIU initializes a self-test routine. During the initialization, the VORAD screen displays and all lamps illuminate for approximately three seconds, along with a power-up tone. When the initialization is complete, the DIU displays the VS-400 system configuration screen. See Fig..
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Configured for CWS only
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Configured for CWS and SmartCruise
Fig. 2, System Configuration Screens
Menu Selections
Important: The display of a menu item is overridden whenever conditions require an alert or collision warning to be displayed.
After initialization, the menu screen is displayed. Scroll to the desired menu item by pressing an arrow button, then press the OK button to select the item. See Fig.. If the driver does not make a selection within 30 seconds, or the vehicle begins to move, the DIU reverts to the system status display.
Fig. 3, Menu Screen
The display of any menu item is overridden whenever conditions require an alert or collision warning to be displayed.
Demo (vehicle must be stationary)
When the vehicle is stationary and Demo mode is selected, the DIU will demonstrate the meaning of all LED and screen displays, including alert messages and sound warnings. Scroll through the demo screens by pressing the down arrow. Pressing any other key exits Demo mode.
Volume
The minimum adjustable volume is 50% of the maximum volume. If the DIU volume is not adjustable, the display screen shows a grayed bar graph whenever volume adjustment is selected. After each ignition switch cycle, the volume will default back to 100%.
Note: Headway and collision alert tones may be suppressed when the brake is applied if the system is configured to do so.
SmartCruise Headway Range
Headway range adjustment is only available with SmartCruise. Headway range is adjustable between 3.25 and 2.25 seconds. The headway range setting will default to 3.25 seconds after each ignition power cycle.
If headway range adjustment is disabled, only the 3.25 sec screen is displayed. See Fig. for the various headway range screens. Press the OK button to exit the menu.
Note: If the headway range is adjusted to three seconds or below and SmartCruise is active, the 3-second collision warning headway alert will not display. All other alerts are not suppressed.
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Minimum headway adjustment
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Maximum headway adjustment
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Headway range disabled
Fig. 4, Headway Range Screen
Brightness
Use the up and down arrows to change the DIU backlight and warning LED brightness. Press the OK button to exit the brightness screen.
The ambient light sensor reading determines if the DIU is in daytime or nighttime mode. Menu-adjusted brightness is applied only to the mode the DIU is in at the time of adjustment. The previous brightness settings are repeated after each ignition cycle. However, the graphic display and the warning LED brightness range are constrained such that they are always visible regardless of how low the brightness is adjusted in all driving conditions. Press the OK button to exit the menu.
Unit Adjustment Screen
The unit adjustment screen allows the driver to select either km/h or mph units for display of SmartCruise set speed. Press OK to exit the mph selection screen.
System Status
System status shows the status of each system, indicating if the system is operating normally. If a system is not operating normally, the system displays Failed beside the system name. Failed indicates that a fault is preventing the system from operating and it cannot be used until the fault is corrected or acknowledged.
Depending on the VS-400 system installed, one of the screens shown in Fig. will appear unless a system fault is active. Press OK to exit the system status menu.
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Status display for CWS and SmartCruise configuration
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Status display for CWS configuration
Fig. 5, System Status Screens
Diagnostics
The DIU displays fault codes currently active when this screen is selected and the vehicle is stationary. See Fig.. Contact an authorized Freightliner service center if fault codes display.
