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Home >> Jeep Truck >> 2005 >> Liberty 4WD V6-3.7L VIN K >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Body Control Module >> Description and Operation >> Functional Operation >> Overhead Console

Overhead Console

ELECTRONIC VEHICLE INFORMATION CENTER (EVIC)
When equipped, the Electronic Vehicle Information Center (EVIC) is located in the overhead console. The EVIC supplements the standard vehicle instrumentation. The EVIC also provides additional driver information, warnings and an interface to enable and disable vehicle programmable features and displays memory system messages. Most of the EVIC display information is received over the PCI bus. The EVIC sends and receives data over the PCI bus, communicating with the BCM, PCM, and the Instrument Cluster.

The EVIC uses a vacuum fluorescent (VF) display to supply the vehicle operator with a compass heading, outdoor temperature, average fuel economy, miles to empty, miles to service, tire pressure (if equipped), trip odometer, and elapsed ignition on time.

The EVIC function buttons are labeled C/T, RESET, STEP, and MENU.

The optional Universal Garage Door Opener (UGDO) known as HomeLink(R) is integrated with the EVIC. The three UGDO buttons are labeled with dots to indicate the channel number.

VEHICLE INFORMATION DISPLAY
The EVIC provides the following functions:
- Compass direction
- Outside temperature
- Elapsed ignition on time
- Distance to empty
- Average fuel economy
- Trip Odometer
- Service Interval
- Customer Programmable Features
- Tire Pressure (if equipped)
- Vehicle Information Warning Message Displays

The 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 Compass Mini-Trip Computer section for problems related to the EVIC.

The EVIC receives the following messages from the Instrument Cluster:
- Low Washer Fluid
- Turn Signal On
- Vehicle Odometer

The EVIC receives the following message from the BCM:
- Door(s) Ajar
- Reargate Ajar
- Liftglass Ajar
- Remote Key Battery Low
- VF display dimming brightness and exterior lamp status
- Elapsed Ignition On Time data
- Distance to Empty
- Average Fuel Economy
- Trip Odometer data
- Tire Pressure Data
- Verification of US/Metric status

The EVIC receives the following message from the PCM:
- Filtered Outside Temperature
- Vehicle Speed
- Engine RPM
- Charging System Voltage

WARNING MESSAGES: When the appropriate conditions exist, the EVIC displays the following warning messages and symbols. Each message is accompanied by a series of beeps.
- TURN SIGNAL ON (with graphic)
- PERFORM SERVICE
- DRIVER DOOR OPEN (with graphic)
- PASSENGER DOOR OPEN (with graphic)
- DOOR(S) OPEN (with graphic) N DOORS OPEN (N=2, 3, 4)
- REARGATE OPEN
- LIFTGLASS OPEN
- HOOD OPEN (BUX Only)
- WASHER FLUID LOW
- REMOTE KEY BATTERY LOW
- NO J1850 MSGS RECEIVED
- LOW TIRE PRESSURE WARNINGS

CUSTOMER PROGRAMMABLE FEATURES:
Press the MENU button to select one of the following displays:
- LANGUAGE (Press STEP button to select one of 5 languages)
- US or METRIC (Press STEP button to toggle between US or Metric units)
- AUTO DOOR LOCKS (Press STEP button to select "Yes" or "No.") (EXCEPT BUX)
- AUTO UNLOCK ON EXIT (Press STEP button to select "Yes" or No.") (EXCEPT BUX)
- REMOTE UNLOCK DRIVER'S DOOR 1st (Press STEP button to select)
- SOUND HORN ON LOCK (Press STEP button to select) (except BUX)
- FLASH LIGHTS ON LOCK/UNLOCK? (Press STEP button to select Yes or No.9)
- HEADLAMP DELAY (Press STEP button to select desired delay)
- SERVICE INTERVAL (Press STEP button to select distance intervals)
- RESET SERVICE DISTANCE (Press STEP button to select "Yes" or "No.")
- TRAIN REMOTE (Press STEP button to select "Yes" or "No.")
- LOW FUEL CHIME (Press STEP button to select "Yes" or "No.")
- RETRAIN TIRE SENSORS (Press STEP button then MENU button to start)

MENU BUTTON
Pressing the MENU button while displaying Compass/Temp or traveler screens will initiate the personalization menu. Pressing the MENU button while in the personalization menu will step the EVIC through the personalization screens. Pressing the MENU button while in the "Retrain Tire Sensors" screen will initiate the tire training process.

STEP BUTTON
The EVIC will enter a traveler screen by pressing the STEP button while the Compass/Temp screen is displayed or by stepping through all the personalization screens with the MENU button. The STEP Button can be used in one of the following ways:
1. To sequentially select one of the 5 displays or blank display in the following order:
- Average Fuel Economy
- Distance to Empty
- Trip Odometer
- Time Elapsed
- Service Mileage
- Off (Blank)
2. To set the magnetic variance zone when VARIANCE = X (X = 1 - 15) is indicated in the VF display.
3. Pressing the STEP button while displaying a personalization screen will toggle the options for that feature.

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 and the EVIC will send a PCI bus beep request to the BCM. If the RESET button is pressed again within 3 seconds, the EVIC will reset ALL of the reset table trip functions and an additional beep request is sent to the BCM. 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. The EVIC module will send a beep request to the BCM.

Simultaneously pressing the RESET button and the C/T button while turning the ignition from Off to On will enter the EVIC into the self-diagnostic mode. The EVIC self-diagnostic mode may also be initiated using the DRBIII(R).

COMPASS/TEMPERATURE (C/T) BUTTON
Pressing the Compass/Temperature Button (C/T) will cause the EVIC to display the compass and temperature information. This function will operate from a traveler display. The EVIC simultaneously displays the compass reading and the outside temperature. Outside temperature information is received via the PCI bus from the BCM.

The EVIC module internally senses and calculates the compass direction.

TRAVELER DISPLAY FUNCTIONS
Using the STEP button will change the EVIC between modes of operation and display the appropriate information according to data received from the PCI Bus.

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

However, if the calibration information stored in the EVIC memory is not within the normal range at ignition on, the 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 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.

SETTING MAGNETIC ZONE VARIANCE




Variance is the difference between magnetic North and geographic North. For proper compass function, the correct variance zone must be set. Refer to the Zone Variance map for the correct zone. Follow these steps to check or change the variance zone:
- The ignition switch must be in the On position and the EVIC display must not be blank.
- If the compass/temperature data is not currently being displayed, momentarily press and release the C/T button to display compass/temp information.
- Press and hold the RESET button until VARIANCE = XX is displayed. The EVIC will display the variance zone stored in memory and the word VARIANCE.
- Use the STEP button to select the proper variance zone number, 1 through 15.
- After selecting the proper zone number, momentarily press and release the RESET button. The variance zone is then stored in the memory and the EVIC returns to normal operation.

COMPASS CALIBRATION
The compass module has 2 types of auto-calibration; slow-cal and fast-cal. Slow-cal ensures that during normal vehicle operation the compass performs auto-calibration functions to keep the compass sensors in their proper operating range. Whenever the ignition is On and the EVIC receives PCI bus data indicating that engine RPM is greater than zero, auto-calibration is performed continuously.

If the calibration information stored in the compass module memory is not within the normal range after a power-up cycle, the compass will display CAL. The EVIC will enter into the fast-cal mode until calibration is complete.

To enter the compass into Manual Calibration mode, perform the following steps:
- Drive the vehicle to an area away from any large metal objects or overhead power lines.
- Ensure that the proper variance zone is selected. See "Setting Magnetic Zone Variance."
- The ignition switch must be in the On position and the EVIC display must not be blank.
- Press the C/T button to view the Compass/ Temperature display.
- Press and hold the RESET button until CAL is displayed, then release the button.
- Drive slowly, less than 5 MPH (8KPH) in at least 1 complete 360 degree circle.
- CAL will remain illuminated to alert the driver that the compass is in the calibration mode.
- After calibration is complete, CAL will turn off. If the compass appears blank, unable to be calibrated, or the compass displays false indications, the vehicle must be demagnetized. Refer to Compass Demagnetizing Procedure.

SELF-CHECK DIAGNOSTICS
The EVIC is capable of performing a diagnostic self check on its internal functions. EVIC diagnostics may be performed using a DRBIII(R) or by using the following procedure:
1. With the ignition switch in the OFF position, depress and hold the RESET and the C/T buttons.
2. Turn the ignition switch to the ON position.
3. Continue to hold both buttons until the software versions are displayed, then release the buttons.
4. When the self-check is complete the EVIC will display one of the following messages:
- PASSED SELF TEST
- FAILED SELF TEST
- FAILED J1850 COMMUNICATION
5. To exit the self-check mode, depress the RESET button or cycle the ignition switch and the EVIC will return to normal operation.

If a Communication fault is displayed, refer to the symptom list. If a FAILED SELF TEST is displayed, the EVIC must be replaced.

AMBIENT TEMPERATURE SENSOR
The ambient air temperature is monitored by the PCM and displayed by the EVIC. The PCM receives a hardwire input from the ambient temperature sensor (ATS).

The ATS is a variable resistor that operates on a 5-volt reference signal circuit hardwired from the PCM. The resistance in the ATS changes as the outside temperature rises or falls. The PCM senses the change in reference voltage through the ATS resistor. Based on the resistance of the ATS, the PCM is programmed to correspond to a specific temperature. The PCM stores and filters the ambient temperature data and transmits this data to the EVIC via the PCI Bus. The ATS cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.

AMBIENT TEMPERATURE SENSOR FAULT CODES
The outside temperature function is supported by the ambient temperature sensor (ATS), a signal and ground circuit hardwired to the PCM, and the EVIC display.
If the EVIC display indicates 54° C (130° F) or the ATS sense circuit is shorted to ground, the temp display will be 54° C (130° F) to indicate a SHORT circuit condition.

If the EVIC display indicates -40° C (-40° F) or the ATS sense circuit is open, the temp display will be -40° C (-40° F) to indicate an OPEN circuit condition.

If there is an OPEN or SHORT circuit condition, it must be repaired before the EVIC VFD can be tested.

The ATS is supported by the PCM. Ambient Temperature Sensor DTC's will be recorded in the PCM. Test the ATS circuits using the diagnostics in the Powertrain Diagnostics Procedures Manual.

AMBIENT TEMPERATURE SENSOR TEST
1. Turn the ignition OFF.
2. Disconnect the ATS harness connector.
3. Measure the resistance of the ATS using the following min/max values:

0° C (32° F) Sensor Resistance = 29.33 - 35.99 kOhms
10° C (50° F) Sensor Resistance = 17.99 - 21.81 kOhms
20° C (68° F) Sensor Resistance = 11.37 - 13.61 kOhms
25° C (77° F) Sensor Resistance = 9.12 - 10.86 kOhms
30° C (86° F) Sensor Resistance = 7.37 - 8.75 kOhms
40° C (104° F) Sensor Resistance = 4.90 - 5.75 kOhms

The sensor resistance should read between these min/max values. If the resistance values are not OK, replace the Sensor.

HOMELINK(R) UNIVERSAL TRANSMITTER
If equipped, the HomeLink(R) Universal Transmitter is integrated into the overhead console. For added security it will operate home security systems that use coded signals known generically as Rolling Codes. The overhead console display provides visual feedback to the operator, indicating which HomeLink(R) transmitter channel button is being pressed. The HomeLink(R) can learn and store up to 3 separate transmitter radio frequency codes to operate garage door openers, security gates, and security lighting. The HomeLink(R) buttons are marked with one, two, or three dots. For complete information, refer to Universal Transmitter.
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