Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Dodge Durango 1998-2000 Approved Dodge Durango 1998-99 98DN_8J
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DN TURN SIGNAL AND HAZARD WARNING SYSTEMS 8J - 1
TURN SIGNAL AND HAZARD WARNING SYSTEMS
CONTENTS
page page
GENERAL INFORMATION WARNING SWITCH . . . . . . . . . . . . . . . . . . . . . 2
HAZARD WARNING SYSTEM . . . . . . . . . . . . . . . 1 DIAGNOSIS AND TESTING
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 3
TURN SIGNAL SYSTEM . . . . . . . . . . . . . . . . . . . 1 MULTI-FUNCTION SWITCH . . . . . . . . . . . . . . . . 4
DESCRIPTION AND OPERATION TURN SIGNAL AND HAZARD WARNING
COMBINATION FLASHER . . . . . . . . . . . . . . . . . . 1 SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
TURN SIGNAL INDICATOR LAMP . . . . . . . . . . . 3 REMOVAL AND INSTALLATION
TURN SIGNAL LAMP . . . . . . . . . . . . . . . . . . . . . 3 COMBINATION FLASHER . . . . . . . . . . . . . . . . . . 5
TURN SIGNAL SWITCH AND HAZARD MULTI-FUNCTION SWITCH . . . . . . . . . . . . . . . . 5
GENERAL INFORMATION HAZARD WARNING SYSTEM
The hazard warning system is activated by a
INTRODUCTION switch button in the multi-function switch. The but-
Turn signal and hazard warning systems are stan- ton is located on the top of the steering column
dard factory-installed equipment on this model. Refer between the steering wheel and the instrument
to 8W-52 - Turn Signals in Group 8W - Wiring Dia- panel. The hazard warning switch button is identi-
grams for complete circuit descriptions and diagrams. fied with a double triangle.
The hazard warning system is connected to a non-
TURN SIGNAL SYSTEM switched battery feed so that the system remains
With the ignition switch in the On or Accessory functional, regardless of the ignition switch position.
position, and the multi-function switch control lever Push the switch button in to activate the hazard
moved up (right turn) or down (left turn), the turn warning system, and push in on the button again to
signal system is activated. The switch has a detent turn the system off. When the hazard warning sys-
position in each direction that provides turn signals tem is activated, the right and left turn signal indi-
with automatic cancellation, and an intermediate cators, front park/turn signal lamps, and rear tail/
momentary position in each direction that provides stop/turn signal lamps will flash.
turn signals only until the multi-function switch Following are general descriptions of the major
lever is released. components in the hazard warning system. Refer to
When the turn signal switch is in a detent posi- the owner's manual in the vehicle glove box for more
tion, it is turned off by one of two cancelling cam information on the features, use and operation of the
lobes molded into the hub of the clockspring mecha- hazard warning system.
nism. When turning the steering wheel causes one of
the cam lobes to contact a cancel actuator in the
multi-function switch, the turn signal switch auto- DESCRIPTION AND OPERATION
matically returns to the off position. When the turn
signal system is activated, the selected (right or left) COMBINATION FLASHER
turn signal indicator lamp, front park/turn signal The combination flasher is a smart relay that func-
lamp, and rear tail/stop/turn signal lamp bulbs will tions as both the turn signal system and hazard
flash. warning system flasher. The combination flasher con-
Following are general descriptions of the major tains active electronic Integrated Circuitry (IC) ele-
components in the turn signal system. Refer to the ments. This flasher is designed to handle the current
owner's manual in the vehicle glove box for more flow requirements of the factory-installed lighting. If
information on the features, use and operation of the supplemental lighting is added to the turn signal
turn signal system. lamp circuits, such as when towing a trailer with
lights, the combination flasher will automatically try
to compensate to keep the flash rate the same.
8J - 2 TURN SIGNAL AND HAZARD WARNING SYSTEMS DN
DESCRIPTION AND OPERATION (Continued)
While the combination flasher has a International Likewise, pin 8 of the IC receives a sense voltage
Standards Organization (ISO)-type relay terminal from the turn signal portion of the multi-function
configuration or footprint, the internal circuitry is switch. When the left or right turn signal is turned
much different. The combination flasher does not use on, the turn signal on sense voltage will become low
standard ISO-relay inputs or provide ISO-relay type due to the circuit being grounded through the turn
outputs or functions. The combination flasher should signal bulbs. This low voltage sense signals the IC to
never be substituted for an ISO-relay or replaced energize the flash control PNP transistor at a pre-
with an ISO-relay, or else component and vehicle calibrated flash rate or frequency. Each time the PNP
damage may occur. transistor energizes the turn signal circuit, the pin 8
The combination flasher has five blade-type termi- turn signal on sense voltage will become high and
nals intended for the following inputs and outputs: the IC signals the PNP transistor to de-energize the
Battery B+, Ignition B+, Ground, Turn Signal circuit, circuit. This cycling will continue until the right or
and Hazard Warning circuit. Constant battery volt- left turn signal is turned off.
age and ground are supplied to the flasher so that it A special design feature of the combination flasher
can perform the hazard warning function, and igni- allows it to sense that a turn signal circuit or bulb
tion switched battery voltage is supplied for the turn is not operating, and provide the driver an indication
signal function. Refer to 8W-52 - Turn Signals in of the condition by flashing the remaining bulbs in
Group 8W - Wiring Diagrams for complete circuit the affected circuit at a higher rate (120 flashes-per-
descriptions, diagrams and terminal function identi- minute or higher). Conventional flashers either con-
fication. tinue flashing at their typical rate (heavy-duty type),
The IC within the combination flasher (Fig. 1) con- or discontinue flashing the affected circuit entirely
tains the logic that controls the flasher operation and (standard-duty type). During turn signal operation,
the flash rate. Pin 6 of the IC receives a sense volt- the combination flasher IC compares normal battery
age from the hazard warning portion of the multi- voltage input on pin 2 with the shunt resistor voltage
function switch. When the hazard switch is turned input on pin 7. If the IC senses that the voltage dif-
on, the hazard on sense voltage will become low due ference between pin 2 and pin 7 is different than the
to the circuit being grounded through the turn signal pre-calibrated value of the IC, it will increase the
bulbs. This low voltage sense signals the IC to ener- rate at which it signals the PNP transistor to ener-
gize the flash control Positive-Negative-Positive gize the pin 1 output. Thus, the inoperative half (left
(PNP) transistor at a pre-calibrated flash rate or fre- or right side) of the turn signal circuit will flash
quency. Each time the PNP transistor energizes the faster.
hazard warning circuit, the pin 6 hazard on sense Because of the active electronic elements within
voltage will become high and the IC signals the PNP the combination flasher, it cannot be tested with con-
transistor to de-energize the circuit. This cycling will ventional automotive electrical test equipment. If the
continue until the hazard warning switch is turned combination flasher is believed to be faulty, test the
off. turn signal and hazard warning system circuits as
described in this group. Then replace the combina-
tion flasher with a known good unit to confirm sys-
tem operation.
The combination flasher cannot be repaired and, if
faulty or damaged, it must be replaced.
TURN SIGNAL SWITCH AND HAZARD WARNING
SWITCH
The turn signal and hazard warning switches are
contained in the multi-function switch assembly (Fig.
2). The multi-function switch assembly is secured to
the left side of the steering column. A switch stalk
that extends from the left side of the steering column
is moved up or down to activate the right or left turn
signals, respectively. A latching push-button that
extends upward from the multi-function switch and
through the top of the upper steering column shroud
is used to control the hazard warning system.
The multi-function switch contains circuitry for the
Fig. 1 Combination Flasher - Typical following functions:
DN TURN SIGNAL AND HAZARD WARNING SYSTEMS 8J - 3
DESCRIPTION AND OPERATION (Continued)
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