Jeep Grand Cherokee Wj 2000 Manual

WJ
TURN SIGNAL AND HAZARD WARNING SYSTEMS
DESCRIPTION AND OPERATION
TURN SIGNAL SYSTEM . . . . . . . . . . . . . . . . . . . . 1
HAZARD WARNING SYSTEM. . . . . . . . . . . . . . . . 2
TURN SIGNAL SWITCH AND HAZARD
WARNING SWITCH . . . . . . . . . . . . . . . . . . . . . . 3
TURN SIGNAL CANCELLING CAM . . . . . . . . . . . . 4
COMBINATION FLASHER . . . . . . . . . . . . . . . . . . . 4
DIAGNOSIS AND TESTING
TURN SIGNAL AND HAZARD WARNING
SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
DESCRIPTION AND OPERATION

TURN SIGNAL SYSTEM

DESCRIPTION
A turn signal system is standard factory-installed
safety equipment on this model. The turn signal sys-
tem allows the vehicle operator to provide the drivers
of other vehicles in near proximity with an optical
indication of his intention to perform a turning
maneuver or to change traffic lanes. The turn signal
system uses ignition switched battery current, and
will operate only when the ignition switch is in the
On position.
Vehicles equipped with the optional Electronic
Vehicle Information Center (EVIC) have a Turn Sig-
nal On warning feature. This feature is designed to
provide the driver with both visual and audible
reminders when a turn signal has been left turned
on for an extended period. Refer to Electronic Vehi-
cle Information Center in the Description and
Operation section of Group 8V - Overhead Console
Systems for more information on the EVIC features.
The turn signal system includes the following com-
ponents:
• Combination flasher
• Front side marker lamps
• Turn signal cancelling cam
• Turn signal indicator lamps
• Turn signal lamps
• Turn signal switch.
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-
TURN SIGNAL AND HAZARD WARNING SYSTEMS

TABLE OF CONTENTS

page
TURN SIGNAL AND HAZARD WARNING
SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
REMOVAL AND INSTALLATION
COMBINATION FLASHER . . . . . . . . . . . . . . . . . . . 9
TURN SIGNAL AND HAZARD WARNING
SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
TURN SIGNAL CANCELLING CAM . . . . . . . . . . . 10
SPECIAL TOOLS
TURN SIGNAL AND HAZARD WARNING
SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
tor lamps. Following are general descriptions of the
major components in the turn signal system. For
complete circuit diagrams, refer to Turn Signals in
the Contents of Group 8W - Wiring Diagrams.
OPERATION
With the ignition switch in the On or Accessory
position, and the turn signal (left or lighting multi-
function) switch control stalk moved up (right turn)
or down (left turn), the turn signal system is acti-
vated. When the turn signal system is activated, the
circuitry of the turn signal switch and the combina-
tion flasher will cause the selected (right or left) turn
signal indicator lamp, front park/turn signal lamp,
front side marker lamp, and rear turn signal lamp to
flash on and off. If the exterior lighting is turned off,
the front park/turn signal lamp and the front side
marker lamp will flash in unison. If the exterior
lighting is turned on, the front park/turn signal lamp
and the front side marker lamp will flash alternately.
The EVIC module uses turn signal status messages
from the Electro-Mechanical Instrument Cluster
(EMIC) module and distance messages from the Pow-
ertrain Control Module (PCM) received over the Pro-
grammable Communications Interface (PCI) data bus
network to determine when the Turn Signal On
warning should be activated. The EMIC receives a
hard wired input from the combination flasher to
determine the proper turn signal status message to
send. If a turn signal is left on for more than about
1.6 kilometers (1 mile) of driving distance, the EVIC
will display the Turn Signal On message and will
send a request to the Body Control Module (BCM)
over the PCI data bus for two sets of three chime
tones to sound.
8J - 1
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