Dodge Durango (DN). Manual — part 294

rotor. The clockspring mechanism provides turn sig-
nal cancellation as well as a constant electrical con-
nection between the horn switch, driver side airbag
module, speed control switches and remote radio
switches on the steering wheel and the instrument
panel wire harness on the steering column. The
housing of the clockspring is secured to the steering
column and remains stationary. The rotor of the
clockspring, including the turn signal cancelling cam
lobes rotate with the steering wheel.

The turn signal cancelling cam is integral to the

clockspring and cannot be repaired. If faulty or dam-
aged, the entire clockspring assembly must be
replaced. Refer to Clockspring in the Removal and
Installation section of Group 8M - Passive Restraint
Systems for the clockspring service procedures.

OPERATION

The turn signal cancelling cam has two lobes

molded into the lower surface of the clockspring
rotor. When the turn signals are activated by moving
the multi-function switch control stalk to a detent
position, a turn signal cancel actuator is extended
from the inside surface of the multi-function switch
housing toward the clockspring rotor. When the
steering wheel is rotated during the turn, one of the
two turn signal cancelling cam lobes will contact the
turn signal cancel actuator, releasing the multi-func-
tion switch control stalk from its detent and cancel-
ling the turn signal event.

COMBINATION FLASHER

DESCRIPTION

The combination flasher is a smart relay that func-

tions as both the turn signal system and the hazard
warning system flasher. The combination flasher con-
tains active electronic Integrated Circuitry (IC) ele-
ments. This flasher is designed to handle the current
flow requirements of the factory-installed lighting. If
supplemental lighting is added to the turn signal
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.

While the combination flasher has a International

Standards Organization (ISO)-type relay terminal
configuration or footprint, the internal circuitry is
much different. The combination flasher does not use
standard ISO-relay inputs or provide ISO-relay type
outputs or functions. The combination flasher should
never be substituted for an ISO-relay or replaced
with an ISO-relay, or else component and vehicle
damage may occur.

Because of the active electronic elements within

the combination flasher, it cannot be tested with con-
ventional automotive electrical test equipment. If the

combination flasher is believed to be faulty, test the
turn signal system and hazard warning system cir-
cuits as described in this group. Then replace the
combination flasher with a known good unit to con-
firm system operation.

The combination flasher has five blade-type termi-

nals intended for the following inputs and outputs:
fused B(+), fused ignition switch output, ground, turn
signal circuit, and hazard warning circuit. Constant
battery voltage and ground are supplied to the
flasher so that it can perform the hazard warning
function, and ignition switched battery voltage is
supplied for the turn signal function. Refer to Turn
Signals in the Contents of Group 8W - Wiring Dia-
grams for complete circuit diagrams.

The combination flasher is located in the relay and

fuse block which is located on the back of the junc-
tion block near the dash panel under the left end of
the instrument panel. The combination flasher can-
not be repaired or adjusted and, if faulty or damaged,
it must be replaced.

OPERATION

The IC within the combination flasher (Fig. 2) con-

tains the logic that controls the flasher operation and
the flash rate. Pin 6 of the IC receives a sense volt-
age from the hazard warning circuit of the multi-
function switch. When the hazard warning switch is
turned on, the

9hazard on sense” voltage will become

low due to the circuit being grounded through the
turn signal bulbs. This low voltage sense signals the
IC to energize the flash control Positive-Negative-
Positive (PNP) transistor at a pre-calibrated flash
rate or frequency. Each time the PNP transistor ener-
gizes the hazard warning circuit, the pin 6 “hazard
on sense” voltage will become high and the IC signals
the PNP transistor to de-energize the circuit. This
cycling will continue until the hazard warning switch
is turned off.

Likewise, pin 8 of the IC receives a sense voltage

from the turn signal circuits of the multi-function
switch. When the left or right turn signal switch is
turned on, the “turn signal on sense” voltage will
become low due to the circuit being grounded
through the turn signal bulbs. This low voltage sense
signals the IC to energize the flash control PNP tran-
sistor at a pre-calibrated flash rate or frequency.
Each time the PNP transistor energizes the turn sig-
nal circuit, the pin 8 “turn signal on sense” voltage
will become high and the IC signals the PNP transis-
tor to de-energize the circuit. This cycling will con-
tinue until the right or left turn signal switch is
turned off.

A special design feature of the combination flasher

allows it to “sense” that a turn signal circuit or bulb is
not operating, and provide the driver an indication of

DN

TURN SIGNAL AND HAZARD WARNING SYSTEMS

8J - 3

DESCRIPTION AND OPERATION (Continued)

the condition by flashing the remaining bulbs in the
affected circuit at a higher rate (120 flashes-per-
minute or higher). Conventional flashers either con-
tinue flashing at their typical rate (heavy-duty type),
or discontinue flashing the affected circuit entirely
(standard-duty type). During turn signal operation,
the combination flasher IC compares normal battery
voltage input on pin 2 with the shunt resistor voltage
input on pin 7. If the IC “senses” that the voltage dif-
ference between pin 2 and pin 7 is different than the
pre-calibrated value of the IC, it will increase the rate
at which it signals the PNP transistor to energize the
pin 1 output. Thus, the inoperative half (left or right
side) of the turn signal circuit will flash faster.

DIAGNOSIS AND TESTING

TURN SIGNAL AND HAZARD WARNING
SYSTEMS

When diagnosing the turn signal or hazard warn-

ing circuits, remember that high generator output
can burn out bulbs rapidly and repeatedly. If this is a
problem on the vehicle being diagnosed, refer to
Charging System in the Diagnosis and Testing sec-
tion of Group 8C - Charging System for further diag-
nosis of a possible generator overcharging condition.

If the problem being diagnosed is related to a fail-

ure of the turn signals to automatically cancel follow-
ing completion of a turn, inspect the multi-function
switch for a faulty or damaged cancel actuator and
inspect the turn signal cancelling cam lobes on the
clockspring mechanism for damage or improper
installation. For complete circuit diagrams, refer to
Turn Signals in the Contents of Group 8W - Wiring
Diagrams.

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,

REFER

TO

GROUP

8M

-

PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING

WHEEL,

STEERING

COLUMN,

OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

(1) Turn the ignition switch to the On position.

Actuate the turn signal switch or the hazard warning
switch. Observe the turn signal indicator lamp(s) in
the instrument cluster. If the flash rate is very high,
check for a turn signal bulb that is not lit or is very
dimly lit. Repair the circuits to that lamp or replace
the faulty bulb, as required. If the turn signal indi-
cator(s) fail to light, go to Step 2.

(2) Turn the ignition switch to the Off position.

Check the turn signal fuse in the junction block
and/or the hazard warning fuse in the Power Distri-
bution Center (PDC). If OK, go to Step 3. If not OK,
repair the shorted circuit or component as required
and replace the faulty fuse(s).

(3) Check for battery voltage at the hazard warn-

ing fuse in the PDC. If OK, go to Step 4. If not OK,
repair the open fused B(+) circuit to the battery as
required.

(4) Turn the ignition switch to the On position.

Check for battery voltage at the turn signal fuse in
the junction block. If OK, go to Step 5. If not OK,
repair the open fused ignition switch output (accesso-
ry/run) circuit to the ignition switch as required.

(5) Turn the ignition switch to the Off position.

Disconnect and isolate the battery negative cable.
Remove the combination flasher from the relay and
fuse block and replace it with a known good unit.
Connect the battery negative cable. Test the opera-
tion of the turn signal and hazard warning systems.
If OK, discard the faulty combination flasher. If not
OK, remove the test flasher and go to Step 6.

(6) Turn the ignition switch to the On position.

Check for battery voltage at the fused ignition switch
output (accessory/run) circuit cavity for the combina-
tion flasher in the relay and fuse block. If OK, go to
Step 7. If not OK, repair the open fused ignition
switch output (accessory/run) circuit to the turn sig-
nal fuse in the junction block as required.

(7) Turn the ignition switch to the Off position.

Check for battery voltage at the fused B(+) circuit
cavity for the combination flasher in the relay and
fuse block. If OK, go to Step 8. If not OK, repair the
open fused B(+) circuit to the hazard warning fuse in
the PDC as required.

(8) Disconnect and isolate the battery negative

cable. Check for continuity between the ground cir-
cuit cavity for the combination flasher in the relay

Fig. 2 Combination Flasher - Typical

8J - 4

TURN SIGNAL AND HAZARD WARNING SYSTEMS

DN

DESCRIPTION AND OPERATION (Continued)

and fuse block and a good ground. There should be
continuity. If OK, go to Step 9. If not OK, repair the
open ground circuit to ground as required.

(9) Disconnect the instrument panel wire harness

connector from the multi-function switch connector
receptacle. Check for continuity between the hazard
signal circuit cavities for the combination flasher in
the relay and fuse block and in the instrument panel
wire harness connector for the multi-function switch.
There should be continuity. If OK, go to Step 10. If
not OK, repair the open hazard signal circuit as
required.

(10) Check for continuity between the turn signal

circuit cavities for the combination flasher in the
relay and fuse block and in the instrument panel
wire harness connector for the multi-function switch.
There should be continuity. If OK, refer to Turn Sig-
nal Switch and Hazard Warning Switch in the
Diagnosis and Testing section of this group. If not
OK, repair the open turn signal circuit as required.

TURN SIGNAL SWITCH AND HAZARD
WARNING SWITCH

The turn signal switch and the hazard warning

switch are integral to the multi-function switch.
Refer to Turn Signal and Hazard Warning Sys-
tems in the Diagnosis and Testing section of this
group before testing the multi-function switch. For
complete circuit diagrams, refer to Turn Signals in
the Contents of Group 8W - Wiring Diagrams.

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,

REFER

TO

GROUP

8M

-

PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING

WHEEL,

STEERING

COLUMN,

OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

(1) Disconnect and isolate the battery negative

cable. Disconnect the instrument panel wire harness
connector from the multi-function switch connector
receptacle.

(2) Using an ohmmeter, perform the switch conti-

nuity checks at the connector receptacle terminals as
shown in the Multi-Function Switch Continuity chart
(Fig. 3).

(3) If the turn signal switch or hazard warning

switch fails any of the continuity checks, replace the
faulty multi-function switch assembly as required. If
the switch circuits are OK, repair the lighting cir-
cuits as required.

REMOVAL AND INSTALLATION

COMBINATION FLASHER

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,

REFER

TO

GROUP

8M

-

PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING

WHEEL,

STEERING

COLUMN,

OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

REMOVAL

(1) Disconnect and isolate the battery negative

cable.

(2) Remove the steering column opening cover

from the instrument panel. Refer to Steering Col-
umn Opening Cover in the Removal and Installa-
tion section of Group 8E - Instrument Panel Systems
for the procedures.

(3) Reach through the outboard side of the steer-

ing column opening in the instrument panel to access
the relay and fuse block on the back of the junction
block (Fig. 4).

(4) Refer to Fuse/Fuse Block in the Contents of

Group 8W - Wiring Diagrams for combination flasher
identification and location.

(5) Remove the combination flasher from the relay

and fuse block.

INSTALLATION

(1) Refer to Fuse/Fuse Block in the Contents of

Group 8W - Wiring Diagrams for proper combination
flasher location.

(2) Position the combination flasher in the proper

receptacle in the relay and fuse block.

(3) Align the combination flasher terminals with

the terminal cavities in the relay and fuse block
receptacle.

(4) Push in firmly on the combination flasher until

the terminals are fully seated in the terminal cavities
in the relay and fuse block receptacle.

(5) Install the steering column opening cover onto

the instrument panel. Refer to Steering Column
Opening Cover in the Removal and Installation sec-
tion of Group 8E - Instrument Panel Systems for the
procedures.

(6) Reconnect the battery negative cable.

DN

TURN SIGNAL AND HAZARD WARNING SYSTEMS

8J - 5

DIAGNOSIS AND TESTING (Continued)

TURN SIGNAL SWITCH AND HAZARD
WARNING SWITCH

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,

REFER

TO

GROUP

8M

-

PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING

WHEEL,

STEERING

COLUMN,

OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

REMOVAL

(1) Disconnect and isolate the battery negative

cable.

(2) If the vehicle is so equipped, unscrew the lever

from the tilt steering column adjuster mechanism
located on the left side of the column just below the
multi-function switch stalk. Turn the lever counter
clockwise to unscrew it from the column.

(3) Remove both the upper and lower shrouds from

the steering column (Fig. 5).

(4) Remove the lower fixed column shroud from

the steering column.

(5) Move the upper fixed column shroud far

enough to access the back of the multi-function
switch (Fig. 6).

(6) Remove the tamper proof mounting screws (a

Snap On tamper proof Torx bit TTXR20B2 or equiv-
alent is required) that secure the multi-function
switch to the steering column.

(7) Gently pull the multi-function switch away

from the steering column far enough to access and
remove the screw that secures the instrument panel

SWITCH POSITIONS

TURN SIGNAL

HAZARD WARNING

CONTINUITY BETWEEN

NEUTRAL

OFF

12 AND 14 AND 15

LEFT

OFF

15 AND 16 AND 17

LEFT

OFF

12 AND 14

LEFT

OFF

22 AND 23 WITH OPTIONAL CORNER LAMPS

RIGHT

OFF

11 AND 12 AND 17

RIGHT

OFF

14 AND 15

RIGHT

OFF

23 AND 24 WITH OPTIONAL CORNER LAMPS

NEUTRAL

ON

11 AND 12 AND 13 AND 15 AND 16

Fig. 3 Multi-Function Switch Continuity

Fig. 4 Combination Flasher Remove/Install

1 – ELECTRONIC COMBINATION FLASHER
2 – RELAY AND FUSE BLOCK

8J - 6

TURN SIGNAL AND HAZARD WARNING SYSTEMS

DN

REMOVAL AND INSTALLATION (Continued)