Electronic Vehicle Information Center: Notes
The Electronic Overhead Module (EOM) (1) is located in the overhead console on some models. The EOM features a large Vacuum Fluorescent Display (VFD) screen (2) for displaying information and back-lit push button function switches labeled C/T (compass/temperature), RESET, STEP and MENU.
The EOM contains a central processing unit and interfaces with other electronic modules in the vehicle over the Programmable Communications Interface (PCI) data bus network. The PCI data bus network allows the sharing of sensor information. This helps to reduce wire harness complexity, reduce internal controller hardware and reduce component sensor current loads. At the same time, this system provides increased reliability, enhanced diagnostics and allows the addition of many new feature capabilities.
The Electronic Vehicle Information Center (EVIC) includes the following display options:
- Average Fuel Economy - provides the average fuel economy the vehicle is achieving.
- Distance To Empty - provides the approximate distance the vehicle can be driven on the current fuel level.
- Trip Odometer - shows the accumulated miles since the last trip computer reset.
- Elapsed time - shows the accumulated ignition-on time since the last trip computer reset.
- Service Mileage - shows the distance remaining until the next scheduled service interval.
- Individual Tire Pressure - shows the current individual tire air pressures.
- Blank - the EVIC computer VF display is turned off.
The EVIC "Menu" push button provides the vehicle operator with a user interface, which allows the selection of several optional customer programmable electronic features to suit individual preferences.
If the vehicle is equipped with the optional Universal Transmitter, the EVIC will also display messages and an icon indicating when the Universal Transmitter is being trained, which of the three transmitter buttons is transmitting and when the transceiver is cleared.
Data input for all EVIC functions, including VFD dimming level, is received through PCI data bus messages. The EOM uses its internal programming and all of its data inputs to calculate and display the requested data. If the data displayed is incorrect, perform SELF-DIAGNOSTIC TEST as described in this article. If these tests prove inconclusive, the use of a scan tool and the proper Diagnostic article are recommended for further testing of the EOM and the PCI data bus.
The EOM cannot be repaired and is available for service only as a unit. This unit includes the push button switches and the plastic module. If any of these components is faulty or damaged, the complete EOM must be replaced. The incandescent bulbs used for EVIC push button back-lighting and the lens are available for service replacement.