Vehicle Information Display

COMPASS/MINI-TRIP COMPUTER (CMTC) OR ELECTRONIC VEHICLE INFORMATION CENTER (EVIC)
When equipped, the Compass/Mini Trip Computer (CMTC) or Electronic Vehicle Information Center (EVIC) is located in the overhead console. The CMTC or EVIC supplements the standard vehicle instrumentation. The CMTC and the EVIC use a vacuum fluorescent (VF) display to supply the vehicle operator with a compass heading, outdoor temperature, average fuel economy, distance to empty, instantaneous fuel economy, trip odometer, elapsed ignition ON time, distance to service, warning messages, and service messages. The EVIC also provides an interface to enable and disable vehicle programmable features and display memory system messages. If equipped, the CMTC or the EVIC is also available with an integrated Universal Garage Door Opener (UGDO) known as HomeLink.

The CMTC and EVIC function buttons are labeled C/T, RESET, STEP and MENU. The three UGDO buttons are labeled with dots to indicate the channel number.

Most of the CMTC or EVIC display information is received over the PCI bus. The CMTC or EVIC sends and receives data over the PCI bus, communicating with the FCM, PCM, and the Instrument Cluster.

VEHICLE INFORMATION DISPLAY
The CMTC/EVIC provides the following functions:
- Compass direction
- Outside temperature
- Elapsed ignition ON time
- Distance to empty
- Average fuel economy
- Instantaneous fuel economy
- Trip odometer
- Distance to service
- Driver alert messages:
- TURN SIGNAL ON (with vehicle graphic)
- PERFORM SERVICE
- DOOR OPEN (individual or multiple doors, with graphic)

An audible chime or chimes will accompany any displayed warning messages. Chime requests with an OPEN message are dependent upon vehicle speed.

The CMTC or EVIC will not display information for any of the screens for which it did not receive the proper PCI bus data. Refer to the symptom list in the Overhead Console section for problems related to the CMTC/EVIC.

The CMTC/EVIC receives the following messages from the Instrument Cluster:
- Verification of US/Metric status
- VF display dimming brightness and exterior lamp status
- Trip Odometer data
- Elapsed Ignition On Time data
- Fuel Economy (Average and Instantaneous)
- Distance to Empty
- Distance to service
- Driver warning messages

The EVIC transmits the following messages to the Instrument Cluster:
- Status Request: Beep, Reset, US/M Toggle
- Current Display

The CMTC/EVIC receives the following message from the PCM:
- Vehicle Speed

STEP BUTTON
The STEP Button can be used in one of the following three ways:

1. To sequentially select one of seven displays or blank display in the following order:
Average Fuel Economy
Distance to Empty
Instantaneous Fuel Economy
Trip Odometer
Time Elapsed
Distance to Service Message
Individual Tire Pressure
Off (Blank)

2. To set the magnetic variance zone when VARIANCE = X (X = 1 - 15) is indicated in the VF display.
3. To select the displayed programmable feature setting.

MENU BUTTON
Use the MENU button to sequentially step the EVIC through the programmable features.

RESET BUTTON
The RESET Button has two different functions:
1. To clear the trip functions that may be reset
2. To enter and exit the diagnostic mode

Pressing the RESET button once will clear the trip function that is currently being displayed (except Distance to Service) and the CMTC/EVIC will send a PCI bus beep request to the Instrument Cluster. If the RESET button is pressed again within 3 seconds, the CMTC/EVIC Will reset ALL of the trip functions and an additional beep request is sent to the Instrument Cluster. The trip functions that may be reset are:
- Average Fuel Economy
- Trip Odometer
- Elapsed Time

A reset will only occur if one of the trip functions that may be reset is currently being displayed. Pressing the RESET button for more than three (3) seconds resets the Distance to Service function while the Distance to Service message is being displayed. The CMTC/EVIC module will send a beep request to the Instrument Cluster.

Simultaneously pressing the RESET button and the C/T button while turning the ignition from OFF to ON will enter the CMTC/EVIC into the self-diagnostic mode.

Compass/Temperature (C/T) Button
Actuating the Compass/Temperature Button (C/T) will cause the CMTC/EVIC to display the compass and temperature information. This function will operate from another traveler display or from the programmable feature mode.

Traveler Display Functions
Using the STEP button will change the CMTC/EVIC between modes of operation and display the appropriate information according to data received from the PCI Bus.

Compass/Temperature
The CMTC/EVIC simultaneously displays the compass reading and the outside temperature. Outside temperature information is received via the PCI bus from the FCM. The CMTC or EVIC module internally senses and calculates the compass direction.

Compass Operation
Upon ignition ON, if the calibration information stored in the CMTC/EVIC memory is within the normal range, the CMTC/EVIC will perform in slow Auto-Cal mode. In slow Auto-Cal mode, the CMTC/EVIC continuously compensates for the slowly changing magnetic field of the vehicle. The compass module detects changes in the vehicle magnetism and makes appropriate internal corrections to ensure proper displayed direction.

However, if the calibration information stored in the CMTC/EVIC memory is not within the normal range at ignition ON, the CMTC/EVIC will enter fast Auto-Cal. CAL is displayed along with the temperature.

Auto activation of the fast Auto-Cal mode will also occur when the CMTC/EVIC is subjected to high magnetic field strength levels, which cause all compass readings to be erroneous for a continuous period of five (5) minutes. During fast Auto-Cal, CAL will be displayed along with the temperature. Fast Auto-Cal can also be performed manually, by pressing and holding the RESET button for 10 seconds during the Compass/Temperature display mode.