Vacuum-Fluorescent Displays
The Vacuum-Fluorescent Display (VFD) units are soldered to the CCN electronic circuit board. Both the standard odometer and gear selector indicator VFD unit and the optional Compass Mini Trip Computer (CMTC) VFD unit are fixed segment dot matrix displays. The optional Electronic Vehicle Information Center (EVIC) VFD unit is a reconfigurable dot matrix display. With the ignition switch in the OFF or ACCESSORY positions, all VFD displays are deactivated. The total odometer information is displayed when the driver door is opened (Rental Car Mode) and is deactivated when the driver door is closed or after five minutes, whichever occurs first. Otherwise, all VFD units are active when the ignition switch is in the ON or START positions, and inactive when the ignition switch is in the OFF or ACCESSORY positions.
The illumination intensity of the VFD units is controlled by the CCN circuitry based upon electronic dimming level messages received over the CAN data bus indicating the exterior lighting is turned ON and the dimming level selected using the panel dimmer function of the thumbwheel on the headlamp switch. The illumination intensity of the CCN VFD units is synchronized with that of other display units in the vehicle by sending the same electronic dimming level message inputs to all electronic modules in the vehicle over the CAN or LIN data bus.
The odometer VFD unit has several display capabilities including odometer, trip odometer A and B, the cruise indicator, gear selector indicator, several textual warning or reminder indications, and various diagnostic information when certain fault conditions exist. The optional CMTC VFD unit displays compass, temperature, average fuel economy, distance to empty, elapsed time and cycles the optional park assist feature ON or OFF. The display options for these VFD units are selected using switches on the CCN circuit board that are actuated using push buttons adjacent to the displays. The optional EVIC VFD unit displays several textual warning or reminder indications, compass, temperature, average fuel economy, distance to empty, elapsed time, audio settings and provides a customer programmable features interface. The EVIC display options are selected using steering wheel-mounted switches.
Actuating the odometer/trip odometer push button momentarily with the ignition switch in the ON position will toggle the odometer VFD between the odometer and trip odometer modes. Depressing the odometer/trip odometer push button for about two seconds while the VFD is in the trip odometer mode will reset the trip odometer value to zero. Holding the odometer/trip odometer push button depressed while turning the ignition switch from the OFF position to the ON position will initiate the instrument cluster self-test. Refer to DIAGNOSIS AND TESTING . The CCN microprocessor remembers which odometer display mode is active when the ignition switch is turned to the OFF position, and returns the display to that mode when the ignition switch is turned ON again.
Actuating the right CMTC push button momentarily with the ignition switch in the ON position will toggle the CMTC VFD between the various display functions, and actuating the left CMTC push button toggles the display between standard and metric units. The CCN microprocessor remembers which display mode is active when the ignition switch is turned to the OFF position, and returns the display to that mode when the ignition switch is turned ON again.
All instrument cluster VFD units are diagnosed using the instrument cluster self-test. Refer to DIAGNOSIS AND TESTING . Proper testing of the CAN or LIN data bus message inputs to the CCN that control some of the VFD functions requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.