Jeep Grand Cherokee Wj 2000 Manual - page 2
See the owner’s manual in the vehicle glove box for
more information on the features, use and operation
of the turn signal system.
HAZARD WARNING SYSTEM
DESCRIPTION
A hazard warning system is standard factory-in-
stalled safety equipment on this model. The hazard
warning system allows the vehicle operator to pro-
vide the drivers of other vehicles in near proximity
an optical indication that the vehicle is disabled or is
an obstacle to traffic flow. Unlike the turn signal sys-
tem, the hazard warning system uses a non-switched
source of battery current so that the system will
operate regardless of the ignition switch position.
The hazard warning system can also be activated
by the Body Control Module (BCM). The BCM is pro-
grammed to activate the hazard warning system
lamps in order to provide the following features:
•
Remote Keyless Entry (RKE) system lock and
unlock request optical verification (customer pro-
grammable)
•
RKE system panic mode optical alert
•
Vehicle Theft Security System (VTSS) optical
alarm.
This vehicle also offers several customer program-
mable features, which allows the selection of several
optional electronic features to suit individual prefer-
ences. Refer to ELECTRONIC VEHICLE INFOR-
MATION
CENTER
PROGRAMMING
in
the
Service Procedures section of Group 8V - Overhead
Console Systems for more information on the cus-
tomer programmable feature options. Customer pro-
grammable feature options affecting the hazard
warning system include:
•
Flash Lights with Lock - Allows the option of
having the lights flash as an optical verification that
the RKE system received a valid Lock request or
Unlock request from the RKE transmitter, or having
no optical verification.
The hazard warning system includes the following
components:
•
Combination flasher
•
Front side marker lamps
•
Hazard warning switch
•
Turn signal indicator lamps
•
Turn signal lamps.
Certain functions and features of the horn system
rely upon resources shared with other electronic
modules in the vehicle over the Programmable Com-
munications Interface (PCI) data bus network. The
PCI data bus network allows the sharing of sensor
information. This helps to reduce wire harness com-
plexity, internal controller hardware, and component
sensor current loads. At the same time, this system
provides increased reliability, enhanced diagnostics,
and allows the addition of many new feature capabil-
ities. For diagnosis of these electronic modules or of
the PCI data bus network, the use of a DRB scan
tool and the proper Diagnostic Procedures manual
are recommended.
The other electronic modules that may affect haz-
ard warning system operation are as follows:
•
Body Control Module (BCM) - Refer to Body
Control Module in the Description and Operation
section of Group 8E - Instrument Panel Systems for
more information.
•
Electronic
Vehicle
Information
Center
(EVIC) - Refer to Electronic Vehicle Information
Center in the Description and Operation section of
Group 8V - Overhead Console Systems for more
information.
Refer to Lamp in the proper section of Group 8L -
Lamps for more information on the exterior turn sig-
nal lamps. Refer to Instrument Cluster in the
proper section of Group 8E - Instrument Panel Sys-
tems for more information on the turn signal indica-
tor lamps. Following are general descriptions of the
major components in the hazard warning system. For
complete circuit diagrams, refer to Turn Signals in
the Contents of Group 8W - Wiring Diagrams.
OPERATION
With the hazard warning switch in the On posi-
tion, the hazard warning system is activated. When
the hazard warning system is activated, the circuitry
of the hazard warning switch and the combination
flasher will cause both the right side and the left side
turn signal indicator lamps, front park/turn signal
lamps, front side marker lamps and rear turn signal
lamps to flash on and off. If the exterior lamps are
turned off, the front park/turn signal lamps and the
front side marker lamps will flash in unison. If the
exterior lamps are turned on, the front park/turn sig-
nal lamps and the front side marker lamps will flash
alternately.
The BCM can also activate the hazard warning
system lamps by energizing the electronic combina-
tion flasher through a single hard wired output cir-
cuit. The BCM energizes and de-energizes the
combination flasher in response to internal program-
ming as well as message inputs received over the
Programmable Communications Interface (PCI) data
bus network. The BCM can energize the combination
flasher for a single flash (RKE lock request), several
flashes (RKE unlock request), or for extended opera-
tion (RKE panic mode and VTSS alarm mode).
See the owner’s manual in the vehicle glove box for
more information on the features, use and operation
of the hazard warning system.
8J - 2
TURN SIGNAL AND HAZARD WARNING SYSTEMS
WJ
DESCRIPTION AND OPERATION (Continued)