Dodge Viper SRT-10 (ZB). Manual — part 79

• Highbeam Flash-to-Pass - The internal cir-

cuitry and hardware of the multi-function switch
includes momentary switching of the headlamp high
beam circuits to provide an input to the BCM and
the BCM controls the optical horn feature (some-
times referred to as flash-to-pass), which allows the
vehicle operator to momentarily flash the headlamp
high beams as an optical signaling device.

• Turn Signal Control - The internal circuitry

and hardware of the multi-function switch provide
both momentary non-detent switching and detent
switching with automatic cancellation for both the
left and right turn signals.

• Front Fog Lamp Control - The internal cir-

cuitry and hardware of the multi-function switch pro-
vide detent switching for activation and deactivation
of the front fog lamps.

• Rear Fog Lamp Control - The internal cir-

cuitry and hardware of the multi-function switch pro-
vide detent switching for activation and deactivation
of the rear fog lamps.

The multi-function switch cannot be adjusted or

repaired. If any function of the switch is faulty, or if
the switch is damaged, the entire switch unit must
be replaced.

HAZARD WARNING SYSTEM

The hazard warning system is identified and actu-

ated by a push button located in the multi-function
switch (Fig. 21), on the top of the steering column
between the steering wheel and the instrument
panel. The hazard switch is identifiable by a double
triangle on front of the button.

The hazard warning system allows the vehicle

operator to provide 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 system, the hazard warning system has
battery current at all times, regardless of ignition
switch position.

OPERATION

LIGHTING

The multi-function switch provides input for the

exterior and interior lighting to the Body Control
Module (BCM). The switch is grounded through the
Body Control Module (BCM). When the ignition
switch is in the ACCESSORY or ON positions, bat-
tery current from a fuse in the Power Distribution
Center (PDC) is provided through a BCM controlled
ignition switch output (RUN/ACC) circuit. The BCM
controls the circuit protection and logic for the Low
Beam relay, High Beam, Park Lamps, and Front Fog
Lamps, and Rear Fog Lamps circuitry. The BCM also
controls the circuit protection and logic for the two

RUN only feeds, RUN/ACCESSORY feed, and the
Ignition Off Draw (IOD) feed.

The multi-function switch controls the follow-

ing headlamp features and provides:

• Headlamp Beam Selection - The turn signal

control stalk on the left side of the multi-function
switch is pulled towards the steering wheel past a
detent, then released to actuate the headlamp beam
selection switch. Each time the control stalk is actu-
ated in this manner, the opposite headlamp mode
from what is currently selected will be activated. The
internal circuitry of the headlamp beam selection
switch directs the output of the headlamp switch to
the BCM and the BCM will activate the selected
headlamp beam.

• Highbeam Flash-to-Pass - The turn signal

control stalk is pulled towards the steering wheel to
just before a detent, to momentarily activate the
headlamp high beams. The high beams will remain
illuminated until the control stalk is released. The
input is detected by the BCM and the BCM will con-
trol the output.

• Front Fog Lamps - The front fog lamp switch

is on the turn signal control stalk. To activate the
front fog lights, turn on the front position lights or
the low beam headlights and pull out the end of the
control lever.

• Rear Fog Lamps - The rear fog lamp switch is

on the turn signal control stalk. To activate the rear
fog lights, turn on the front position lights or the
headlights, pull out the end of the control lever and
rotate the lever to the last detent.

• Turn Signal Control - The turn signal control

stalk actuates the turn signal switch. When the con-
trol stalk is moved in the upward direction, the right
turn signal circuitry is activated; and, when the con-
trol stalk is moved in the downward direction, the
left turn signal circuitry is activated. The multi-func-
tion switch turn signal circuitry simultaneously pro-
vides a signal to the turn signal sense of the
combination flasher to activate or deactivate the
flasher output, and directs the output of the flasher
to the proper turn signal lamps. The turn signal
switch has a detent position in each direction that
provides turn signals with automatic cancellation,
and an intermediate, momentary position in each
direction that provides turn signals only until the left
multi-function switch control stalk is released. When
the control stalk is moved to a turn signal switch
detent position, the cancel actuator extends toward
the center of the steering column. A turn signal can-
cel cam that is integral to the clock spring mecha-
nism rotates with the steering wheel and the cam
lobes contact the cancel actuator when it is extended
from the multi-function switch. When the steering
wheel is rotated during a turning maneuver, one of

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LAMPS

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MULTI-FUNCTION SWITCH - EXPORT (Continued)

the two turn signal cancel cam lobes will contact the
turn signal cancel actuator. The cancel actuator
latches against the cancel cam rotation in the direc-
tion opposite that which is signaled. In other words,
if the left turn signal detent is selected, the lobes of
the cancel cam will ratchet past the cancel actuator
when the steering wheel is rotated to the left, but
will unlatch the cancel actuator as the steering wheel
rotates to the right and returns to center, which will
cancel the turn signal event and release the control
stalk from the detent so it returns to the neutral
OFF position.

If only momentary signaling, such as indication of

a lane change, is desired, the switch is actuated to a
left or right intermediate detent position. In this
position, the signal lamps flash as described above,
but the switch returns to the OFF position as soon as
the lever is released.

When the system is activated, one of two indicator

lamps mounted in the instrument cluster flashes in
unison with the turn signal lamps, indicating to the
driver that the system is operating.

WIPERS

The

multi-function

switch

uses

conventionally

switched outputs and a variable resistor to control
the many functions and features it provides using
hard wired circuitry. The switch uses body ground
(Z1) when the ignition switch is in the Accessory or
ON position; battery current from a fuse in the
Power Distribution Center (PDC) is provided through
a BCM controlled ignition switch output (RUN/ACC)
circuit.

• Continuous Wipe Modes - When the control

knob is in the OFF position, the wiper system com-
pletes the cycle and the blades park in the lowest
portion of the wipe pattern When the control knob of
the windshield wiper/washer control stalk on the
right side of the multi-function switch is rotated to
the High or Low positions, the circuitry within the
switch provides a battery current output directly to
the high or low speed brush of the wiper motor.
When the control knob is in the OFF position, the
wiper system completes the cycle and the blades park
in the lowest portion of the wipe pattern.

• Intermittent Wipe Mode - When the wind-

shield wiper/washer control switch control is rotated

to the Delay position, the circuitry within the switch
connects the output of the wiper motor relay to the
low speed brush of the wiper motor and provides bat-
tery current.

• Washer Mode - Pulling windshield wiper/

washer control towards the steering wheel provides a
battery current output through the momentary single
pole, single throw washer switch circuitry to operate
the washer pump/motor.

HAZARD WARNING SYSTEM

The hazard warning switch is pushed down to

unlatch the switch and activate (turn ON) the hazard
warning system, and pushed down again to latch the
switch and turn the system OFF. When the hazard
warning switch is latched (hazard warning OFF), the
push button will be in a lowered position on the top
of the steering column shroud; and, when the hazard
warning switch is unlatched (hazard warning ON),
the push button will be in a raised position. The
multi-function

switch

hazard

warning

circuitry

simultaneously provides a signal to the hazard warn-
ing sense of the combination flasher to activate or
deactivate the flasher output, and directs the output
of the flasher to the hazard warning lamps. When
the hazard warning system is activated, the combina-
tion flasher will cause both the right and 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
signal lamps and the side marker lamps will flash
alternately.

DIAGNOSIS AND TESTING - MULTI-FUNCTION
SWITCH

FLASHER DIAGNOSIS

Should any function of the multi-function switch

fail, the entire switch assembly must be replaced
(Refer to 8 - ELECTRICAL/LAMPS/LIGHTING -
EXTERIOR/MULTI-FUNCTION

SWITCH

-

REMOVAL).

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LAMPS

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MULTI-FUNCTION SWITCH - EXPORT (Continued)

TURN SIGNAL AND HAZARD WARNING FLASHER DIAGNOSIS

CONDITION

POSSIBLE CAUSES

CORRECTION

TURN SIGNAL FLASHES AT
TWICE THE NORMAL RATE.

(1) FAULTY EXTERNAL LAMP.

(1) REPLACE LAMP.

(2) POOR GROUND AT LAMP.

(2) CHECK AND/OR REPAIR WIRING.

(3) OPEN CIRCUIT IN WIRING
TO EXTERNAL LAMP.

(3) CHECK AND/OR REPAIR WIRING.

(4) FAULTY CONTACT IN
SWITCH.

(4) REPLACE MULTI FUNCTION
SWITCH.

INDICATOR LAMP ILLUMI-
NATED BRIGHTLY, EXTERNAL
LAMP GLOWS DIMLY AT A
RAPID RATE.

(1) LOOSE OR CORRODED
EXTERNAL LAMP CONNEC-
TION.

(1) REPLACE SOCKET CONNECTION.

(2) POOR GROUND CIRCUIT
AT EXTERNAL LAMP.

(2) REPAIR WIRING HARNESS, CHECK
CONNECTORS.

(3) OPEN INSTRUMENT CLUS-
TER.

(3) REPLACE INSTRUMENT CLUSTER.

HAZARD WARNING SYSTEM
DOES NOT FLASH.

(1) FAULTY FUSE.

(1) REPLACE FUSE.

(2) FAULTY FLASHER.

(2) REPLACE FLASHER.

(3) OPEN CIRCUIT IN FEED
WIRE TO SWITCH.

(3) REPAIR WIRING HARNESS, CHECK
CONNECTORS.

(4) FAULTY CONTACT IN
SWITCH.

(4) REPLACE MULTI FUNCTION
SWITCH.

(5) OPEN OR GROUNDED
CIRCUIT IN WIRING TO
EXTERNAL LAMPS.

(5) REPAIR WIRING HARNESS.

INDICATOR LAMP ILLUMI-
NATES BRIGHTLY, EXTERNAL
LAMP DOES NOT LIGHT.

(1) OPEN CIRCUIT IN WIRE
TO EXTERNAL LAMP.

(1) REPAIR WIRING HARNESS.

(2) BURNED OUT LAMP.

(2) REPLACE LAMP.

SYSTEM DOES NOT FLASH
ON EITHER SIDE.

(1) FAULTY FUSE.

(1) REPLACE FUSE.

(2) FAULTY FLASHER UNIT.

(2) REPLACE FLASHER.

(3) LOOSE BULKHEAD CON-
NECTOR.

(3) TIGHTEN CONNECTOR.

(4) LOOSE OR FAULTY REAR
WIRING HARNESS OR TERMI-
NALS.

(4) REPAIR WIRING HARNESS

(5) OPEN CIRCUIT TO
FLASHER UNIT.

(5) CHECK CONNECTORS, REPAIR
WIRING HARNESS.

(6) OPEN CIRCUIT IN FEED
WIRE TO TURN SIGNAL
SWITCH.

(6) CHECK CONNECTORS, REPAIR
WIRING HARNESS.

(7) FAULTY SWITCH CONNEC-
TION IN SWITCH.

(7) REPLACE MULTI FUNCTION
SWITCH.

(8) OPEN OR GROUNDED
CIRCUIT IN WIRING TO
EXTERNAL LAMPS.

(8) REPAIR WIRING HARNESS.

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LAMPS

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MULTI-FUNCTION SWITCH - EXPORT (Continued)

CONDITION

POSSIBLE CAUSES

CORRECTION

SYSTEM DOES NOT CANCEL
AFTER COMPLETION OF THE
TURN.

(1) BROKEN CANCELLING FIN-
GER ON SWITCH.

(1) REPLACE MULTI FUNCTION
SWITCH.

(2) BROKEN OR MISSING
CANCELLING CAM ON CLOCK
SPRING.

(2) REPLACE CLOCK SPRING.

EXTERNAL LAMPS OPERATE
PROPERLY, NO INDICATOR
LAMP OPERATION.

(1) FAULTY INDICATOR LAMP
IN INSTRUMENT CLUSTER.

(1) REPLACE LAMP.

(2) OPEN CIRCUIT OR WIR-
ING.

(2) REPAIR WIRING HARNESS.

SWITCH DIAGNOSIS

To test the switch:
(1) Disconnect and isolate the battery negative

cable.

(2) Remove the upper and lower steering column

shrouds.

(3) Disconnect the switch connector.
Using an ohmmeter, test for continuity (no resis-

tance) between the terminals of the switch as shown
in the Multi-Function Switch Continuity Test table
for diagnosis. Refer to (Fig. 22), (Fig. 23), and (Fig.
24) for connector terminal locations.

NOTE: If the ohmmeter shows resistance values
greater than 1000 ohms, then the multi-function
switch

is

considered

defective

and

must

be

replaced.

Fig. 22 COMBINATION FLASHER CONNECTOR (A)

Fig. 23 MULTI-FUNCTION SWITCH CONNECTOR (B)

Fig. 24 WINDSHIELD WIPER/WASHER SWITCH

CONNECTOR (C)

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MULTI-FUNCTION SWITCH - EXPORT (Continued)