Grand Cherokee 2WD Limited V8-4.7L (2002)
Diagnosis starts with symptom identification. If a complete PCI Bus Communication Failure is suspected, begin by identifying which modules the
vehicle is equipped with and then attempt to get a response from the modules with the DRB III. If any modules are responding, the failure is not
related to the total bus, but can be caused by one or more module's PCI circuit or power supply and ground circuits. The DRB III may display
"BUS +/- SIGNAL OPEN" or "NO RESPONSE" to indicate a communication problem. These same messages will be displayed if the vehicle is
not equipped with that particular module. The CCD error message is a default message used by the DRB III and in no way indicates whether or not
the PCI bus is operational. The message is only an indication that a module is either not responding or the vehicle is not equipped.
VEHICLE THEFT SECURITY SYSTEM
The Vehicle Theft Security System (VTSS) is controlled by the body control module, which monitors vehicle doors, liftgate, liftglass and the
ignition for unauthorized operation. The alarm activates by sounding the horn, flashing the headlamps, hazard lamps, and the VTSS indicator
lamp. The VTSS does not prevent engine operation, this is done with the sentry key immobilizer module. Passive arming occurs upon normal
vehicle exit by removing the ignition key, opening the driver door, locking the doors with the power lock, and closing the driver door or locking
the doors with RKE. The indicator lamp on the dash will flash for 15 seconds, showing that arming is in progress. If no monitored systems are
activated during this period, the system will arm and the indicator will flash at a slower rate. When something triggers the alarm, the system will
signal the headlamps, park lamps, and horn for about 18 minutes.
For complaints about the Theft Alarm going OFF on it's own, use the DRB III and select "Theft Alarm", "VTSS" then "Monitor Display" and read
the "Alarm Tripped By" status.
Tamper Alert - The VTSS tamper alert will sound the horn three times upon disarming to indicate a tamper condition has occurred,
Manual Override - The system will not arm if the doors are locked using the manual lock control or if the locks are actuated by an inside occupant
after the doors are closed.
To verify the system, proceed as follows:
1. Open the driver's door.
2. Remove the ignition key (but keep it in hand).
3. Lock the doors with the power lock switch or the RKE.
4. Close the driver's door.
NOTE:
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After the doors are closed, locking the doors with RKE will also arm the system.
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If the VTSS indicator lamp flashed, the system is operational and verified. If not, there may be a problem with the system.
Arming/Disarming - Active arming occurs when the remote keyless entry transmitter is used to lock the vehicle doors, whether the doors are open
or closed. If one or more doors are open, the arming sequence is completed only after all doors are closed.
Passive disarming occurs upon normal vehicle entry (unlocking driver's door with the key). This disarming also will halt the alarm once it has been
activated.
Active disarming occurs when the remote keyless entry transmitter is used to unlock the vehicle doors. This disarming also will halt the alarm once
it has been activated.
Intrusion Transceiver Module (Export Only)
The Body Control Module (BCM) along with an Intrusion Transceiver Module (ITM) will control the premium Vehicle Theft Security System
(VTSS) on export vehicles. Premium VTSS also includes a battery-backed siren for the audible alert. In addition to the other features of the base
VTSS the ITM is used to monitor the interior of the vehicle for movement while the alarm is set. This feature can also be disabled with three
additional lock commands from the Remote Keyless Entry system (which will be confirmed with an audible chirp) during the VTSS pre-arming
sequence.
When the alarm is tripped it will actuate the hazard lamps for 25 seconds and the siren 25 seconds.After that period if the disturbance is still
present only the siren will be activated again for 28 seconds with 5 seconds intervals between warning cycles. This will continue up to ten times
unless the disturbance goes away. Also while the alarm is set the siren will monitor it's Fused B(+) and Siren Signal Control circuits. If either of
these circuits become open the siren will trip itself to the alarming state.
NOTE:
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The intrusion transceiver module and/or siren must never be swapped from one vehicle to another. Once connected to a particular vehicle they
will only properly function for that vehicle.
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If the VTSS indicator lamp comes ON after ignition ON and stays ON, the PCI bus communication with the powertrain control module
possibly has been lost.
WINDSHIELD WIPER & WASHER
Front Wiper
The front wiper system consists of the following features: lo-hi-speed, mist wipers, intermittent wipers, and wipe after wash. The front wiper
