Part 2 of 3

CHIME SYSTEM
The chime system in the WJ utilizes four modules. The Body Control Module (BCM), the Electronic Vehicle Information Center (EVIC), and Mechanical Instrument Cluster (MIC), and the SKIM module. The 2001 WJ also has the PCM included and has the ability to request a chime. The chime is located in the BCM module. Each module monitors circuits and systems, then sends a request for a chime to the BCM. The BCM is constantly monitoring the PCI bus for a chime request message. If a MIC, EVIC, or SKIM monitored system requires a chime to sound, the request for the chime will come from the MIC, EVIC, or SKIM but the BCM will actually sound the chime.

The chime will sound for the following conditions:

MIC Requested Chime Messages
- Airbag
- Check Gauges:
- Charging Voltage
- Low Coolant Temp High
- Low Oil Pressure
- Charging Voltage High
- Low Fuel
- ABS
- Low Battery Voltage

BCM Initiated Chime Messages
- Headlamp ON with ignition OFF and driver door open
- Key in ignition with ignition OFF and driver door open
- Seat Belt Warning

Critical Speed Chart:

EVIC Chime Requested Messages
When the following messages are displayed the EVIC will send a chime request to the BCM. The BCM will respond with a series of chimes.
- Turn signal ON for more than 1.0 mile
- Service reminder
- Coolant level low
- Washer fluid low
- Door or liftgate ajar (when critical speed is reached)

Sentry Key Immobilizer System
The Sentry Key Immobilizer System (SKIS) also uses tactile beep support from the chime warning system. The Sentry Key Immobilizer Module (SKIM) is programmed to send chime request messages over the Programmable Communications Interface (PCI) data bus to the Body Control Module (BCM) to provide audible confirmation that:
- the SKIM has been successfully placed in the Customer Learn mode.
- A new Sentry key transponder has been successfully programmed by the SKIM.

See the owner's manual in the vehicle glove box for more information on the features, use and operation of the SKIS. Refer to Sentry Key Immobilizer System in the Description and Operation of the service information - Vehicle Theft Alarm systems for more information on the SKIS. For diagnostic information, refer to the Powertrain Diagnostic Information.

DOOR AJAR SYSTEM
The door ajar, liftgate ajar, and the liftgate flip-up ajar states are used as inputs for various control modules on the vehicle. The DRB III will display the state of the door ajar, liftgate ajar, and liftgate flip-up ajar switches in Inputs/Outputs. It's important to note, that when a door, liftgate, or liftgate flip-up is closed, the switch state on the DRB III will show OPEN, and when the door, liftgate, or liftgate flip-up is open, the switch state will show CLOSED. During diagnosis, if a door, liftgate, or liftgate flip-up is closed and the DRB III displays the switch state as CLOSED, it indicates a shorted ajar circuit. If the door, liftgate, or liftgate flip-up is open and the DRB III displays the switch state as OPEN, it indicates an open ajar circuit.

DOOR MODULES
A multiplexed door module is located on each front door, driver door (DDM) and passenger door (PDM). They control the following features: power door locks, automatic (rolling) door locks, driver window express down, memory recall functions (memory seats and mirrors), remote keyless entry, power mirrors, heated mirrors, door key cylinder disarm (driver door only), door lock inhibit and auto unlock on exit. Reduced wiring complexity is a key feature of using multiplexed door modules. These modules are addressable with the DRB III from the "Body" menu to facilitate faster and easier diagnosis.

Power Windows
The power windows can be raised or lowered from the driver's door module (DDM) or the individual door switch. The DDM has a lock out switch that prevents the windows from being operated from any switch except the driver's door. When the switch is pressed, it also shuts OFF the individual door switch LED's.

A feature of this system allows the windows to be operated from any window switch for 45 seconds after the ignition is turned OFF, provided a front door is not opened. Another feature is the "Express Down" driver door only. When the driver presses the down switch to the second detent, the window will travel all the way down even if the switch is released. To stop the window travel, simply press the switch momentarily in either direction.

Twelve volts are provided on the rear window motor circuit on both the up and down circuits. The appropriate door module supplies this voltage. When the rear switch is pressed, the supply circuit to one side of the switch is opened and ground is provided making a complete circuit and therefore operating the window motor.

Power Door Locks
The power door locks are operated four different ways:
1. Front door lock switches
2. Auto (rolling) door lock feature (vehicle speed above 15 MPH (24 kMH) and all doors closed).
3. Auto unlock on exit (vehicle stopped after auto door locks had locked the doors, transmission in neutral or park and the drivers door is opened - all doors will unlock).
4. Remote Keyless Entry (RKE)

Door Lock Inhibit
When the key is in the ignition and in the OFF position, and either front door is opened, the lock switch on that door is disabled. The unlock switch is still functional. This protects against locking the vehicle with the keys still in the ignition. For example, if the driver's door is opened and the passenger front door closed, the locks are operational from the passenger door switch.

Remote Keyless Entry
When the lock button on the transmitter is pressed, all locks will lock, illuminated entry will be turned OFF, (providing all doors are closed) and the vehicle theft security system (if equipped) will be armed. When the unlock button on the transmitter is pressed one time, the driver front door will unlock, the illuminated entry will turn ON the courtesy lamps, the vehicle theft security system (if equipped) will be disarmed. When the button is pressed a second time, the other doors will unlock, This feature is programmable to open all doors on one press using the EVIC or the DRB III.

The passenger door module (PDM) contains the RKE receiver. When the PDM receives a valid signal from the RKE transmitter, it will send a signal on the PCI bus to lock or unlock the doors. The RKE transmitter used radio frequency signals to communicate with the RKE receiver. If vehicle is equipped with the memory system, the memory message will be received as to which transmitter sent the signal (1 or 2).

Panic Function
When the panic button on the RKE transmitter is pressed it pulsates the headlamp, hazard lamps and horn relays and actuates the courtesy lamp relay. By pressing the button again the horn and exterior lamps will stop but the courtesy lamps will remain ON until the BCM times them out or the ignition is turned ON. The panic feature is able to be set if the ignition is ON but only if the panic button is pressed prior to the vehicle being started, it will continue for three minutes or until the vehicle has reached a speed of 15 MPH, if not canceled by the operator.

Actuating the headlamp, horn, hazard lamps and courtesy lamp relays with the DRB III will verify that the circuits and the body control module are OK. If the panic feature is still inoperable with both transmitters, replacement of the passenger door module will be necessary. If the function is inoperable with just one transmitter, then it is obvious that the transmitter must be replaced.

Rolling Code
The rolling code feature changes part of the transmitter message each time that it is used. The transmitter message and the receiver message increment together. Under certain conditions with a rolling code system (pressing a button on the RKE transmitter over 255 times outside the receiver range, battery replacement, etc.), the receiver and transmitter can fall out of synchronization. Note: That the lock function works from the RKE keyfob even in out of synchronization condition and therefore it could be verified by pressing the LOCK button on the RKE keyfob. To re-synchronize, depress and release the UNLOCK button on the RKE keyfob repeatedly (it may take up to eight cycles) while listening carefully for the power door locks in the vehicle to cycle, indicating that resynchronization has occurred.

Programmable Door Lock. Features
- The RKE can be changed to unlock all doors with one press
- The Automatic Door Locks can be enabled/disabled
- Auto Unlock on Exit can be enabled/disabled
- RKE horn chirp on lock can be enabled/disabled
- RKE optical chirp (turn signal lamps) can be enabled/disabled
- Program a new RKE transmitter (DRB III only)
- RKE linked to memory (if equipped with memory system) enabled/disabled (DRB III only). Allows memory to be operable only from the driver door switch.

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 HomeLink(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 kMH). 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.

- 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.

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

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

Compass Variance Map:

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 Universal Transmitter
The HomeLink 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 HomeLink transmitter button is pressed. As on prior models, HomeLink 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 PCI 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 OFF 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.