DESCRIPTION
Three overhead consoles options are available on this vehicle. These options are
- The Electronic Vehicle Information Center (EVIC)
- The Compass Mini-Trip Computer (CMTC)
All consoles are equipped with two reading/courtesy lamps and if the vehicle is equipped with a power liftgate or power sliding door(s) the overhead console will also include switches for these features. The overhead console is mounted with one screw and two snap clips to a molded plastic retainer bracket located above the headliner.
DESCRIPTION - COMPASS
All overhead consoles include compass information. While in the compass/temperature mode, the compass will display the direction in which the vehicle is pointed using the eight major compass headings (Examples: north is N, northeast is NE). The self-calibrating compass unit requires no adjusting in normal use. The only calibration that may be necessary is to drive the vehicle in three complete circles at 5 to 8 kilometers-per-hour (3 to 5 miles-per-hour), on level ground, for a minimum of forty-eight seconds. This will reorient the compass unit to its vehicle.
The compass unit will also compensate for magnetism the vehicle may acquire during normal use. However, avoid placing anything magnetic directly on the roof of the vehicle. Magnetic mounts for an antenna, a repair order hat, or a funeral procession flag can exceed the compensating ability of the compass unit if placed on the roof panel. The use of magnetic tools on the fasteners that hold the overhead console assembly to the roof header can also affect compass operation. If the compass operation is erratic and roof magnetization is suspected (Refer to ELECTRICAL/OVERHEAD CONSOLE - STANDARD PROCEDURE - COMPASS DEMAGNETIZING) .
DESCRIPTION - TEMPERATURE
All overhead consoles include temperature information. The temperature displays the outside ambient temperature in whole degrees. The temperature display can be toggled from Fahrenheit to Celsius by selecting the desired U.S./Metric option from the customer programmable features. The displayed temperature is not an instant reading of conditions, but an average temperature. It may take the temperature display several minutes to respond to a major temperature change, such as driving out of a heated garage into winter temperatures.
When the ignition switch is turned to the Off position, the last displayed temperature reading stays in the electronic control modules (CMTC, EVIC) memory. When the ignition switch is turned to the On position again, the electronic module will display the memory temperature for one minute; then update the display to the current average temperature reading within five minutes.
The temperature function is supported by an ambient temperature sensor. The sensor is mounted near the front and center of the vehicle, and is hard wired to the Powertrain Control Module (PCM). The PCM sends temperature status messages to the module over the Programmable Communication Interface (PCI) data bus circuit.
The Electronic Vehicle Information Center (EVIC) is located in the overhead console. The EVIC features a large Vacuum Fluorescent Display (VFD) screen for displaying information, and back-lit push button switches labeled C/T (compass/thermometer), RESET, STEP, and MENU. The EVIC module contains a central processing unit and interfaces with other electronic modules in the vehicle over the Programmable Communications Interface (PCI) data bus circuit.
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. (Refer to ELECTRICAL/OVERHEAD CONSOLE/ELECTRONIC VEHICLE INFO CENTER - STANDARD PROCEDURE - ELECTRONIC VEHICLE INFORMATION CENTER PROGRAMMING) .
If the vehicle is equipped with the optional universal transmitter transceiver, the EVIC will also display messages and an icon indicating when the universal transmitter transceiver 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 the PCI data bus circuit. The EVIC module uses its internal programming and all of its data inputs to calculate and display the requested data. If the data displayed is incorrect, perform the SELF - DIAGNOSTIC TEST (Refer to ELECTRICAL/OVERHEAD CONSOLE - DIAGNOSIS AND TESTING) . If these tests prove inconclusive, the use of a DRBIII(R) scan tool and the proper diagnostic procedures information are recommended for further testing of the EVIC module and the PCI data bus circuit.
The EVIC module cannot be repaired, and is available for service only as a unit. This unit includes the plastic module and display lens. If any of these components is faulty or damaged, the complete EVIC module must be replaced.
OPERATION
The Electronic Vehicle Information Center (EVIC) uses both non-switched and ignition switched sources of battery current so that some of its features remain operational at any time, while others may only operate with the ignition switch in the On position. When the ignition switch is turned to the On position, the EVIC module Vacuum Fluorescent Display (VFD) will return to the last function being displayed before the ignition was turned to the Off position.
The compass/thermometer display is the normal EVIC display. With the ignition switch in the On position, momentarily depressing and releasing the C/T (compass/thermometer) push button switch will cause the EVIC to return to the compass/thermometer/trip computer display mode from any other mode. While in the compass/thermometer/trip computer display mode, momentarily depressing and releasing the Step push button will step through the available trip computer display options.
The EVIC trip computer features several functions that can be reset. The functions that can be reset are
- Average fuel economy
- Trip odometer
- Elapsed time
With the ignition switch in the On position and with one of the functions of the trip computer that can be reset currently displayed, depressing the Reset push button twice within four seconds will perform a global reset, and all of the trip computer information that can be reset will be reset to zero. With the ignition switch in the On position and the function that is to be reset currently displayed, momentarily depressing and holding the Reset push button for one second will perform a local reset, and only the value of the displayed function will be reset to zero. A global or local reset will only occur if the function currently displayed is a function that can be reset. The distance to service function can also be reset using the local reset method, but it will reset back to the Service Interval distance that is set in the EVIC programmable features mode. (Refer to ELECTRICAL/OVERHEAD CONSOLE/ELECTRONIC VEHICLE INFO CENTER - STANDARD PROCEDURE) .
The Compass Mini-Trip Computer (CMTC) module is located in the overhead console. The CMTC consists of a electronic control module with a vacuum fluorescent display (VFD) and function switches. The CMTC consists of a electronic module that displays compass, trip computer, and temperature features. Actuating the STEP push button will cause the CMTC to change mode of operation when the ignition is ON. Example
- Average miles per gallon (ECO)
- Distance to empty (DTE)
- Instant miles per gallon (ECO)
- Trip odometer (ODO)
- Elapsed time (ET)
- Blank
Actuating the C/T push button will cause the CMTC to change to the Compass/Temperature display.
The Compass Mini-Trip Computer (CMTC) module in the overhead console has buttons used to select various functions. The CMTC selector buttons will not operate until the ignition is in the RUN position.
When the ignition switch is first turned to the RUN position the CMTC display
- Blanks momentarily
- All segments of the VFD will light for one second
- Blanks momentarily
- Returns to the last mode setting selected before the ignition was last switched OFF.
A Universal Transmitter transceiver is available on some vehicles. The universal transmitter transceiver is integral to the Electronic Vehicle Information Center (EVIC) and the Compass Mini-Trip Computer (CMTC) modules, which are located in the overhead console. The only visible component of the universal transmitter are the three transmitter push buttons centered between the modules push buttons located just rearward of the display screen in the overhead console. The three universal transmitter push buttons are identified with one, two or three light indicators so that they can be easily identified.
Each of the three universal transmitter push buttons controls an independent radio transmitter channel. Each of these three channels can be trained to transmit a different radio frequency signal for the remote operation of garage door openers, motorized gate openers, home or office lighting, security systems or just about any other device that can be equipped with a radio receiver in the 286 to 399 MegaHertz (MHz) frequency range for remote operation. The universal transmitter is capable of operating systems using either rolling code or non-rolling code technology.
The electronics module displays messages and a small house-shaped icon with one, two or three dots corresponding to the three transmitter buttons to indicate the status of the universal transmitter. The EVIC messages are
- Cleared Channels - Indicates that all of the transmitter codes stored in the universal transmitter have been successfully cleared.
- Training - Indicates that the universal transmitter is in its transmitter learning mode.
- Trained - Indicates that the universal transmitter has successfully acquired a new transmitter code.
- Transmit - Indicates that a trained universal transmitter button has been depressed and that the universal transmitter is transmitting.
The universal transmitter cannot be repaired, and is available for service only as a unit with the EVIC or CMTC modules. If any of these components is faulty or damaged, the complete EVIC or CMTC module must be replaced.
Ambient air temperature is monitored by the overhead console through ambient temperature messages received from the Powertrain Control Module (PCM) over the Programmable Communications Interface (PCI) data bus circuit. The PCM receives a hard wired input from the ambient temperature sensor. The ambient temperature sensor is a variable resistor mounted to a bracket that is secured with a screw to the right side of the headlamp mounting module grille opening, behind the radiator grille and in front of the engine compartment.
For additional information on the PCM, (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - DESCRIPTION) .
The ambient temperature sensor is a variable resistor that operates on a five-volt reference signal sent by the Powertrain Control Module (PCM). The resistance in the sensor changes as temperature changes, changing the temperature sensor signal circuit voltage to the PCM. Based upon the resistance in the sensor, the PCM senses a specific voltage on the temperature sensor signal circuit, which it is programmed to correspond to a specific temperature. The PCM then sends the proper ambient temperature messages to the Electronic Vehicle Information Center (EVIC)/Compass Mini-Trip Computer (CMTC) over the Programmable Communication Interface (PCI) data bus.
The thermometer function is supported by the ambient temperature sensor, a wiring circuit, the PCM, the PCI data bus, and the Electronics module. If any portion of the ambient temperature sensor circuit fails, the PCM will self-diagnose the circuit.
The ambient temperature sensor circuit can also be diagnosed manually (Refer to ELECTRICAL/OVERHEAD CONSOLE/AMBIENT TEMP SENSOR - DIAGNOSIS AND TESTING - AMBIENT TEMPERATURE SENSOR CIRCUIT) . If the temperature sensor and circuit are confirmed to be OK, but the temperature display is inoperative or incorrect, (Refer to ELECTRICAL/OVERHEAD CONSOLE - DIAGNOSIS AND TESTING) to determine the cause. For complete circuit diagrams, refer to appropriate SYSTEM WIRING DIAGRAMS article.
See also:
• BODY DIAGNOSTIC PROCEDURES