Part 2B

ELECTRONIC VEHICLE INFORMATION CENTER (EVIC)
A new overhead console (EVIC), which is standard on Limited and optional on Laredo, combines features of the former mini trip computer and Vehicle Information Center into an Electronic Vehicle Information Center (EVIC). The Vehicle Information Center includes a unique interface that allows customers to program operation of several electronic features to suit their individual preferences. On Limited, EVIC also includes the Home Link (R) universal remote transceiver.

A blue-green vacuum-fluorescent 80 x 16 dot- matrix screen displays the information. The screen also displays a vehicle icon that is used for door and liftgate ajar indications and to show if a turn signal has been left ON. Overhead console messages and displays are coordinated with warning indicators in the instrument cluster to avoid duplication. The console also houses courtesy/reading lamps.

Vehicle Information Display
The Vehicle Information Center provides the following functions:
- Compass direction
- Current outside temperature
- Elapsed time
- Miles/kilometers to empty
- Average fuel economy
- Instantaneous fuel economy
- Trip odometer
- Miles/kilometers to service
- Warning messages:
- TURN SIGNALS ON (with vehicle icon)
- PERFORM SERVICE
- DOOR AJAR (one or more, with vehicle icon)
- LIFTGATE AJAR (with vehicle icon)
- COOLANT LEVEL LOW (with graphic)
- WASHER FLUID LOW (with graphic)

The appearance of warning messages is accompanied by a series of beeps.

All of the information required by the EVIC is transmitted over the PCI bus from the BCM or PCM.

Vehicle Icon Displayed Ajar Messages
The BCM monitors all door switches and broadcasts a PCI bus status message to the EVIC. If a door is opened or closed the EVIC responds by changing the appropriate icon and message. The door icons and messages will not update if the EVIC cannot detect the bus message. If the car is moving at critical speed and any door, liftgate, are open, the appropriate message and icon will be displayed. A beep request will be generated when critical speed is reached for the first time. All the door icons consist of two segments.

Programmable Features
For each programmable feature, pressing the MENU button selects the menu of programmable features, which always begins with Language. Pressing the STEP button cycles the available choices. Continued pressing of the MENU button accepts the new choice and selects successive features for possible programming/reprogramming. Pressing the C/T (compass-temperature display selector) button returns the display to the normal (compass-temperature display) mode. When the sequence is complete, the display also returns to the normal mode. Features that are dependent on vehicle equipment; such as REMOTE LINKED TO MEMORY EASY EXIT, only appear if applicable.

- Customer Programmable Features:
- LANGUAGE?
The driver may select English, Francaise, Deutsch, Italiana, Espanol. The word Language is always in English regardless of which language is selected. All other display nomenclature, including the compass-temperature and trip computer functions, appears in the selected language.

- DISPLAY US OR METRIC?
Toggles the trip computer temperature, fuel economy, and odometer display readings between the two sets of units. It also changes the odometer display in the instrument cluster.

- AUTO DOOR LOCKS?
When this feature is selected, all doors and the liftgate lock automatically when vehicle speed reaches 15 mph (25 kph). Previously this feature could be programmed only by a dealer.

- AUTO UNLOCK ON EXIT?
When automatic locking is chosen, automatic unlocking may also be selected. When selected, all doors will unlock when the driver's door is open if the vehicle is stopped and the transmission is in Park or Neutral. Grand Cherokee is the first Chrysler vehicle to offer this feature.

- REMOTE UNLOCK?
The driver may choose to have all doors and the liftgate unlock at the first press of the unlock button, or unlock only the driver's door on the first press and require a second press to unlock all doors and the liftgate.

- REMOTE LINKED TO MEMORY?
When chosen, the Jeep Memory System will select memorized seat, mirror and radio settings when an RKE (remote keyless entry) transmitter unlock button is pressed. If not chosen, selection of memorized settings may still be done using the memory buttons. Grand Cherokee is the first Chrysler vehicle to offer selection of memory features using the RKE transmitter.

- SOUND HORN ON LOCK?
When selected, a short horn pulse will occur when the RKE lock button is pressed. This feature may be selected with or without FLASH LAMP ON LOCK/UNLOCK? Vehicles built in Graz do not have this feature as it is not allowed in Europe.

- FLASH LAMP ON LOCK/UNLOCK?
If enabled, front and rear turn signal lamps will flash once when the doors are locked, and four times when the doors are unlocked using the RKE transmitter. This feature may be selected with or without SOUND HORN ON LOCK?

- HEAD LAMP DELAY
The driver may choose to have the head lamps remain ON, when leaving the vehicle, for 30 seconds, 60 seconds, 90 seconds or not at all.

- HEAD LAMPS ON WITH WIPERS?
On vehicles with automatic head lamps, the driver may choose to have the head lamps turn ON simultaneously with the windshield wipers. If the head lamps were turned ON in this way, they will also turn OFF with the wipers. Previously, this action occurred automatically on vehicles equipped with automatic head lamps.

- SERVICE INTERVAL
This feature selects an interval from 2000 to 7500 miles (3,200 to 12,000 kilometers) in 500 mile (800 kilometer) increments between PERFORM SERVICE alert messages. When service has been performed, the counter is reset by pressing and holding the RESET button for 3 seconds as before.

- RESET SERVICE DISTANCE?
If SERVICE INTERVAL is changed, this message asks if the accumulated service distance should be reset to 0 because the service was performed.

- LOW FUEL CHIME?
If enabled, a single chime will sound as an added reminder when the instrument cluster low fuel icon illuminates. The chime will sound once per ignition cycle.

- EASY EXIT SEAT?
If enabled, the driver's seat moves rearward two inches (55 mm) (or to the farthest rearward position, if this is less) when the key is removed from the ignition switch to facilitate driver exit from the vehicle. If the REMOTE LINKED TO MEMORY feature is enabled, the seat will return to the memorized position when the RKE unlock button is pressed.

Memory Messages
- MEMORY #X POSITION SET (X - 1 or 2)
This message appears when the Jeep Memory System is programmed. It is accompanied by a chime tone.

- MEMORY SYSTEM DISABLED
This message appears when the driver presses a memory button or the RKE unlock button with the seat belt fastened, and/or the vehicle moving to notify the driver why memory action did not occur.

Setting The Compass
compass Calibration -

CAUTION: DO NOT PLACE ANY EXTERNAL MAGNETS, SUCH AS MAGNETIC ROOF MOUNT ANTENNAS, IN THE VICINITY OF THE COMPASS. DO NOT USE MAGNETIC TOOLS WHEN SERVICING THE OVERHEAD CONSOLE.

The electronic compass unit features a self-calibrating design, which simplifies the calibration procedure. This feature automatically updates the compass calibration while the vehicle is being driven. This allows the compass unit to compensate for small changes in the residual magnetism that the vehicle may acquire during normal use. If the compass readings appear to be erratic or out of calibration, perform the following calibration procedure. Also, new service replacement Electronic Vehicle Information Center (EVIC) modules must have their compass calibrated using this procedure. Do not attempt to calibrate the compass near large metal objects such as other vehicles, large buildings, or bridges; or, near overhead or underground power lines.

NOTE: WHENEVER THE COMPASS IS CALIBRATED MANUALLY, THE VARIANCE NUMBER MUST ALSO BE RESET. FOR COMPASS CALIBRATION REFER TO SERVICE INFORMATION.

If the module displays the temperature while the compass is blank, or displays a false reading, the vehicle must be demagnetized. See the service information for the proper procedure.

If the compass still goes blank after the vehicle is demagnetized, the EVIC must be replaced.




Compass Variation Adjustment -
Compass variance, also known as magnetic declination, is the difference in angle between magnetic north and true geographic north. In some geographic locations, the difference between magnetic and geographic north is great enough to cause the compass to give false readings. If this problem occurs, the compass variance setting may need to be changed.

To set the compass variance:
1. Using the Variance Settings map, find your geographic location and note the zone number.
2. Turn the ignition switch to the ON position. If the compass/thermometer data is not currently being displayed, momentarily depress and release the C/T push button to reach the compass/thermometer display.
3. Depress the Reset push button and hold the button down until "VARIANCE = XX" appears in the display. This takes about five seconds.
4. Release the Reset push button. "VARIANCE = XX" will remain in the display. "XX" equals the current variance code setting.
5. Momentarily depress and release the Step push button to step through the zone numbers, until the zone number for your geographic location appears in the display.
6. Momentarily depress and release the Reset push button to enter the displayed zone number into the EVIC module memory.
7. Confirm that the correct directions are now indicated by the compass.

NOTE: DO NOT ATTACH ANY MAGNETIC DEVICE SUCH AS A MAGNETIC CB ANTENNA TO THE VEHICLE. THIS CAN CAUSE THE COMPASS TO GIVE FALSE READINGS.

Homelink (R) Universal Transmitter -
The Home Link universal Transmitter is integrated with the standard overhead console on Limited. For added security it will operate home security systems that use coded signals known generically as rolling codes to increase security. The overhead console display provides visual feedback to the driver, showing which Home Link transmitter button is pressed. As on prior models, Home Link can learn and store three separate transmitter radio frequency codes to operate garage door openers, security gates, and security lighting. Buttons are marked with one, two or three raised dots for identification by touch.

Self-Diagnostic Test
The self-diagnostic test is used to determine that the internal circuitry and compass are operating properly, and all PCT bus messages are being received for initial operation. The button backlighting is also verified by flashing the bulbs for proper operation.

Initiate the self-diagnostic test as follows:
1. With the ignition switch in the OFF position, simultaneously press and hold the C/T button and the RESET button.
2. Turn the ignition switch to the ON position.
3. Continue to hold both buttons until the software versions are displayed.
4. The display will show the result of the self-diagnostics test. If the display reads:
a. PASS SELF TEST - press the RESET button to return to the compass/temperature display. The EVIC is working properly.
b. FAILED SELF TEST - an internal failure has occurred. Replace EVIC.
c. FAILED J1850 COMMUNICATION - refer to the communication .

Ambient Temperature Sensor
The thermometer function is supported by the ambient temperature sensor, a wiring circuit, the Body Control Module (BCM), the Programmable Communications Interface (PCI) data bus, and a portion of the Electronic Vehicle Information Center (EVIC) module. If any portion of the ambient temperature sensor circuit fails, the EVIC module will self-diagnose the circuit. A "Short Circuit" message will appear in the display in place of the temperature, when the sensor is exposed to temperatures above 55 °C (131 °F), or if the sensor circuit is shorted. An "Open Circuit" message will appear in the display in the place of the temperature, when the sensor is exposed to temperatures below -40 °C (-40 °F), or if the sensor circuit is open.

EXTERIOR LIGHTING SYSTEM
Exterior Lighting Battery Saver
The BCM monitors the status of and controls the park lamp, head lamp and fog lamp relay's. If any exterior lamps are left ON after the ignition is turned OFF, the BCM will turn them OFF after 8 minutes.

Headlamp Delay
The headlamp time delay operates when the ignition switch is turned OFF while the headlamps are still ON. This feature is customer programmable to provide a 30, 60 or 90 second time delay before turning OFF the headlamps. This feature can also be disabled.

Headlamp Switch
The headlight switch on WJ vehicles use a multiplexed (MUX) circuit to the BCM. The BCM will then control the park lamp, low/high head lamp and fog lamp relay's based on this input.

Fog Lamp Control
The body control module controls the operation of the fog lamp relay which controls the fog lamps. The fog lamps can only be ON if the park or low beam headlamps are ON. If the high beams are turned ON, the fog lamps will automatically be turned OFF.

INTERIOR LIGHTING
Courtesy Lamp Control
The body controller has direct control over all of the vehicle's courtesy lamps. The body computer will illuminate the courtesy lamps under any of the following conditions:
1. Any door is ajar and courtesy lamp switch on the left multi-function switch is not in the dome OFF position.
2. The courtesy lamp switch on the left multi-function switch is in the dome ON position.
3. A Remote Keyless entry unlock message is received.
4. Driver door unlocked with key (with VTSS only).

Illuminated Entry
Illuminated entry will be initiated when the customer enters the vehicle by unlocking the doors with the key fob, or with the key if the vehicle is equipped with vehicle theft alarm. Upon exiting the vehicle, if the lock button is pressed with a door open, illuminated entry will cancel when the door closes. If the doors are closed and the ignition switch is turned ON, the illuminated entry also cancels. The illuminated entry feature will not operate if the courtesy lamp switch is in the dome OFF position.

Interior Lighting Battery Saver
If any of the interior lamps are left ON after the ignition is turned OFF' the BCM will turn them OFF after 8 minutes. To return to normal operation, the courtesy lamps will operate after the dome lamp switch or door ajar switch changes state. The glove box, switched reading lamps and vanity lamps require that the ignition be turned to the ON/ACC position.

MECHANICAL INSTRUMENT CLUSTER (MIC)
The Mechanical Instrument Cluster (MIC) is divided into 4 sections. Primary gauges, (speedometer and tachometer) secondary gauges, (fuel level, oil pressure, coolant temperature and charging voltage), PCI bus indicator lights and hardwired indicator lights. The gauge mechanisms are all the same, the only difference is the face plate or the physical size of the gauge. The Part Time 4WD indicator, left and right turn signal indicators, and brake warning lamp are hard wired and are not part of any actuator or self test. A "Master Illumination" indicator has been added for the 2000 MY This illuminates any time the park lamps are ON. This indicator is not a part of the self test and does not have a bulb check which is the same for the front fog lamps and high beam indicator. The PCM sends the signals necessary for the cluster to position the gauges. The MIC receives messages directly from the bus and translates them into gauge positions, indicator levels and dimming levels. These messages are received when the ignition is in the "run" or "start" position. The MIL indicator is sent to the MIC from the PCM over the PCI bus. The Vacuum Fluorescent (VF) odometer/trip and cruise display works with the key in the "run" or "start" positions. The BCM sends dimming level message to the MIC at "key ON".

When the ignition is turned "ON" a bulb-check is performed. This consists of activating most of the PCI bus controlled indicator lamps for approximately 2 to 4 seconds.

By holding the "trip/reset" button in while turning the key to the "run" position you can actuate the MIC self test. If the speedometer or tachometer pointer is on the wrong side of the pointer stop, performing the MIC self test will put them in the proper position.

The following lamps are controlled by the PCM (JTEC) over the PCI Bus:
- Low Fuel
- Check Engine
- Trans Over Temp (EATX controlled when equipped)
- O/D OFF (EATX controlled when equipped)
- Cruise

The following lamps are controlled by the BCM over the PCI Bus:
- Front Fog Indicator
- Seatbelt
- High Beam Indicator
- Low Coolant Level

The Instrument Cluster controls the operation of the Seatbelt (for the first 6 to 8 seconds) and the Check Gages lamp. The Anti-Lock Brake Control module controls the operation of the ABS lamp and Brake lamp over the PCI Bus. The Airbag Control Module controls the operation of the Airbag lamp over the PCI Bus. The SKIM controls the operation of the SKIM lamp over the PCI Bus.

If any of the lamps mentioned above do not illuminate during a bulb check or with the DRBIII (R) when performing a "self test", inspect the bulb for an open. If the bulb is not open, and the system associated with the lamp operates properly, replace the instrument cluster case assembly.

If any of the lamps mentioned above stays on after the engine is started, check the system associated with the lamp for diagnostic trouble codes. If no codes are present, and the system associated with the lamp operates properly, replace the instrument cluster case assembly.

Instrument Panel Dimming
I/P dimming is accomplished using the body computer. The panel dimming level switch is read by the body computer which converts the level to a value that is sent over the PCI bus. Other modules such as the Radio, MIC, and the EVIC use this data so their display intensity matches the other incandescent bulbs in the vehicle that are driven directly by the BCM.

MEMORY SEATS
The memory system consists of the driver power seat, both outside rear view mirrors and the radio presets. The memory module for the seat is mounted under the driver's seat, The module is available with or without the heated seat feature. The seat module receives input from the 8-way power seat switch, the driver's seat position sensors, both front seat Negative Temperature Coefficients (NTC's) (if heated seat equipped) and the PCI bus circuit. The memory switch, located on the driver door, is wired directly to the driver door module and sends its messages over the PCI bus. The memory seat module performs the following functions: position the drivers seat, actuate the drivers and passengers seat heaters (if equipped) and sends the memory location over the PCI bus.

When a memory button is pressed (#1 or #2) on the memory switch, the driver door module sends a recall message to the memory seat module (MSM), the PCI radio and the passenger door module. They will in turn position the driver seat, both mirrors and set the radio presets. When the RKE button is pressed, depending on which transmitter (#1 or #2), the passenger door module sends the recall message.

Power Seat
The memory power seat provides the driver with 2 position settings for the driver's seat. Each power seat motor is connected to the MSM with two circuits. Each circuit is switched between battery and ground. By alternating the circuits the MSM controls the movement of the motors based on input from the seat mounted switch.

Each motor contains a potentiometer to monitor the seat position. To monitor the position of the motor, the MSM sends out a 5-volt reference on the sensor supply circuit. The sensor is grounded back to the module on a common ground circuit. Based on the position of the sensor, the MSM monitors the voltage change through the sensor on a separate signal circuit.

The MSM stores the input value of each of the four seat potentiometers in memory when the system is requested. The driver can initiate memory recall, using either the memory switch or the RKE transmitter. When initiated, the MSM adjusts the four seat motors to match the memorized seat position data.

For safety reasons, the memory seat recall is disabled by the MSM when the vehicle is out of park position or if the seatbelt is buckled. Any obstruction to seat movement over a 2 second delay will cause the seat to stop moving in which case a stalled motor would be detected by the MSM which would then flag a trouble code and the corresponding seat output would be deactivated. However, if the object obstructing the seat is removed, the seat will function normally again.

Memory Seat Glide (If Equipped)
The intent of this feature is to allow for easier entry and exit to the vehicle by moving the seat rearward a short distance when the operator turns the vehicle OFF. The seat can be recalled to one of it's two set memory positions by pressing either of the memory recall buttons on the switch or the RKE transmitters. If any seat movement is initiated, whether manual or by memory recall, after the ignition has been turned OFF, this will cancel any ensuing glide to enter movement until the next ignition cycle.

This feature can be enabled/disabled by the owner through the electronic vehicle information center (EVIC) or using the DRBIII (R). When using the DRBIII (R) it will also inform as to what state it is in. To reinstate the feature, simply repeat the process.

Guard Bands
The module provides guard bands which prevent the seat track from hitting the hard limits of the given seat axis during manual power seat operation. The guard band values for each hard limit are stored in EEPROM. The guard band can be bypassed by running the seat to the end of its travel and then releasing the switch and pressing it again. The seat will move a short distance further. Once the seat is past the guard band, it can be stored in memory, but if recall is initiated the seat will move to the guard bands and no further.

When a seat module or seat track assembly is replaced, the DRBIII (R) must be used to perform the "Reset Guard Bands" procedure. WARNING: The operator must be out of the seat when this procedure is being used as the seat will move to the end of it's travel in all 8 positions.

Electrically Heated Seats
The heated seat feature is available with or without the memory system. The module is located under the driver's seat and is known as the Heated Seat Module (HSM) or the Memory Heated Seat Module (MHSM). The control switches for the heated seats are located on the instrument panel and are wired to the body control module. The BCM then sends the message to the HSM via the PCI bus. The system offers two seat temperature settings of approximately 96.8 °F (36 °C) (LO) and approximately 107.6 °F (41 °C) (HI).

As the temperature in the seat rises, the negative temperature coefficient (NTC) resistance decreases and the voltage reading detected by the HSM decreases. The seat heater output is deactivated once the voltage reading reaches it's threshold for either setting, high or low.

As the temperature decreases, the voltage reading increases until the upper threshold is reached for either setting high or low. At this point the seat heat output is activated once again and this cycle repeats itself as long as the seat heat request is ON. The thresholds for low and high settings are preprogrammed into the module memory.

The heated seat switch contain resistors pulled up to 5 volts which are processed by the body control module as the voltage readings indicating desired heat setting high or low.

The heater elements inside the seat back and cushion are different for the Limited and Laredo models. The Laredo seat heater elements are wired in series whereas the Limited seat elements are wired in parallel. This means that if an element is open in a Laredo model there will be no heater output to either the cushion or the seat back. If an element is open in a Limited model, the other elements will operate as usual. However, if one of the elements is open, the seat cushion will have to be replaced.

There are three heater elements in the seat cushions for both models. The Laredo uses a resistor wire for its center and both side bolsters (raised outer side panels) and the Limited uses a carbon fiber element for its center and resistor wire for the bolsters.