2003 JEEP GRAND CHEROKEE Switch

the two rear latch receptacles of the mounting
bracket above the headliner.
(5) Push upward firmly and evenly on the rear
edge of the ITM trim cover until the two rear latch
features of the module are engaged and latched in
the mounting bracket above the headliner.
(6) Reconnect the battery negative cable.
NOTE: If the Intrusion Transceiver Module (ITM) has
been replaced with a new unit, the new ITM MUST
be initialized before the Vehicle Theft Security Sys-
tem can operate as designed. The use of a DRBIIIT
scan tool is required to initialize the ITM. Refer to
the appropriate diagnostic information.
SIREN
DESCRIPTION
An alarm siren module is part of the premium ver-
sion of the Vehicle Theft Alarm (VTA) in the Vehicle
Theft Security System (VTSS) (Fig. 9). The premium
version of the VTA is only available in vehicles built
for certain markets, where the additional features
offered by this system are required. The alarm siren
module is located in the right front frame rail. This
unit is designed to provide the audible alert require-
ments for the premium VTA.
The alarm siren module consists of microprocessor,
the siren, and a nickel metal hydride backup battery.
All of the alarm module components are protected
and sealed within the housing.The alarm siren module cannot be repaired or
adjusted and, if faulty or damaged, it must be
replaced.
OPERATION
The microprocessor within the alarm siren module
provides the siren unit features and functions based
upon internal programming and arm and disarm
messages received from the Intrusion Transceiver
Module (ITM) over a dedicated serial bus communi-
cation circuit. The alarm siren module will self-detect
problems with its internal and external power supply
and communication circuits, then send messages
indicating the problem to the ITM upon receiving a
request from the ITM. The ITM will store a Diagnos-
tic Trouble Code (DTC) for a detected alarm siren
module fault that can be retrieved with the DRBIIIt
scan tool over the Programmable Communications
Interface (PCI) data bus.
When the premium version of the Vehicle Theft
Alarm (VTA) is armed, the alarm siren module con-
tinuously monitors inputs from the ITM for messages
to sound its siren and enters its auto-detect mode.
While in the auto-detect mode, if the alarm siren
module detects that its power supply or communica-
tion circuits are being tampered with or have been
sabotaged, it will sound an alarm and continue to
operate through its on-board backup battery. If the
arm siren module is in its disarmed mode when its
power supply or communication circuits are inter-
rupted, the siren will not sound. The alarm module
will also notify the ITM when the backup battery
requires charging, and the ITM will send a message
that will allow the backup battery to be charged
through the battery voltage and ground circuits to
the alarm module only when the ignition switch is in
the On position and the engine is running. This will
prevent the charging of the alarm backup battery
from depleting the charge in the main vehicle battery
while the vehicle is not being operated.
The alarm siren module receives battery voltage
through a fuse in the Power Distribution Center
(PDC), and is grounded to the chassis. These connec-
tions allow the alarm siren module to remain opera-
tional, regardless of the ignition switch position. The
hard wired inputs and outputs for the alarm siren
module may be diagnosed and tested using conven-
tional diagnostic tools and procedures. However, con-
ventional diagnostic methods will not prove
conclusive in the diagnosis of the internal circuitry or
the backup battery of the alarm siren module, the
ITM, the serial bus communication line, or the mes-
sage inputs to and outputs from the alarm siren
module. The most reliable, efficient, and accurate
means to diagnose the alarm siren module, the ITM,
the serial bus communication line, and the electronic
Fig. 8 INTRUSION TRANSCEIVER MODULE
RETAINER RING
1 - STAMPED NUT (2)
2 - MOUNTING BRACKET
3 - HEADLINER
4 - LATCH RECEPTACLES (4)
WJVEHICLE THEFT SECURITY 8Q - 13
INTRUSION TRANSCEIVER MODULE (Continued)

message inputs to and outputs from the alarm siren
module requires the use of a DRBIIItscan tool.
Refer to the appropriate diagnostic information.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Disconnect the alarm siren module wiring har-
ness connector. (Fig. 9).
(3) Remove the screws that secure the alarm siren
module to the left frame rail.
(4) Remove the alarm siren module.
INSTALLATION
(1) Position the alarm siren module on to the left
frame rail. (Fig. 9).
(2) Install and tighten the screws that secure the
alarm siren moduleto the frame rail. Tighten the
screws to 6 N´m (50 in. lbs.).
(3) Reconnect the alarm siren module wiring har-
ness connector.
(4) Reconnect the battery negative cable.
NOTE: If the alarm siren module has been replaced
with a new unit, the new unit MUST be configured
in the Intrusion Transceiver Module (ITM) before the
Vehicle Theft Security System can operate as
designed. The use of a DRBIIITscan tool is requiredto configure the alarm siren module settings in the
ITM. Refer to the appropriate diagnostic informa-
tion.
SKIS INDICATOR LAMP
DESCRIPTION
A Sentry Key Immobilizer System (SKIS) indicator
lamp is standard equipment on all instrument clus-
ters, but is only functional on vehicles equipped with
the optional SKIS. The amber SKIS indicator lamp is
located to the right of the oil pressure gauge.
OPERATION
The Sentry Key Immobilizer System (SKIS) indica-
tor lamp gives an indication to the vehicle operator of
the status of the SKIS. This lamp is controlled by a
transistor on the instrument cluster circuit board
based upon messages received by the cluster from
the Sentry Key Immobilizer Module (SKIM) over the
Programmable Communications Interface (PCI) data
bus. The SKIS indicator lamp bulb receives battery
current on the instrument cluster circuit board
through the fused ignition switch output (st-run) cir-
cuit whenever the ignition switch is in the On or
Start positions. The lamp bulb only illuminates when
it is provided a path to ground by the instrument
cluster transistor. The instrument cluster will turn
on the SKIS indicator lamp for the following reasons:
²Bulb Test- Each time the ignition switch is
turned to the On position, the SKIM tells the cluster
to illuminate the lamp for about three seconds.
²SKIS Lamp-On Message- Each time the clus-
ter receives a SKIS lamp-on message from the SKIM,
the lamp will be illuminated. The lamp can be
flashed on and off, or illuminated solid, as dictated
by the message from the SKIM. For more informa-
tion on the SKIS and the SKIS lamp control param-
eters, (Refer to 8 - ELECTRICAL/VEHICLE THEFT
SECURITY - OPERATION - SENTRY KEY IMMO-
BILIZER SYSTEM). The lamp remains illuminated
until the cluster receives a lamp-off message from
the SKIM or until the ignition switch is turned to the
Off position, whichever occurs first.
²Actuator Test- Each time the cluster is put
through the actuator test, the lamp will be turned on
for the duration of the test to confirm the functional-
ity of the lamp and the cluster.
The SKIM performs a self-test each time the igni-
tion switch is turned to the On position to decide
whether the system is in good operating condition.
The SKIM then sends a message to the instrument
cluster. If the SKIS indicator lamp fails to light dur-
ing the bulb test, replace the bulb. For further diag-
nosis of the SKIS indicator lamp or the instrument
Fig. 9 Siren Remove/Install
1 - SIREN
2 - FRAME
8Q - 14 VEHICLE THEFT SECURITYWJ
SIREN (Continued)

cluster circuitry that controls the lamp, (Refer to 8 -
ELECTRICAL/INSTRUMENT CLUSTER - DIAGNO-
SIS AND TESTING). If the instrument cluster turns
on the SKIS indicator lamp after the bulb test, either
solid or flashing, it indicates that a SKIS malfunction
has occurred or that the SKIS is inoperative. For
proper diagnosis of the SKIS, the PCI data bus, or
the message inputs to the instrument cluster that
control the SKIS indicator lamp, a DRBIIItscan tool
and the appropriate diagnostic information are
required.
TRANSPONDER KEY
DESCRIPTION
Each ignition key used in the Sentry Key Immobi-
lizer System (SKIS) has an integral transponder chip
(Fig. 10). Ignition keys with this feature can be
readily identified by a gray rubber cap molded onto
the head of the key, while conventional ignition keys
have a black molded rubber cap. The transponder
chip is concealed beneath the molded rubber cap,
where it is molded into the head of the metal key.
Each new Sentry Key has a unique transponder iden-
tification code permanently programmed into it by
the manufacturer. The Sentry Key transponder if
faulty or damaged, must be replaced.
OPERATION
When the ignition switch is turned to the On posi-
tion, the Sentry Key Immobilizer Module (SKIM)communicates through its antenna with the Sentry
Key transponder using a Radio Frequency (RF) sig-
nal. The SKIM then waits for a RF response from the
transponder through the same antenna. The Sentry
Key transponder chip is within the range of the
SKIM transceiver antenna ring when it is inserted
into the ignition lock cylinder. The SKIM determines
whether a valid key is present in the ignition lock
cylinder based upon the response from the transpon-
der. If a valid key is detected, that fact is communi-
cated by the SKIM to the Powertrain Control Module
(PCM) over the Programmable Communications
Interface (PCI) data bus, and the PCM allows the
engine to continue running. If the PCM receives an
invalid key message, or receives no message from the
SKIM over the PCI data bus, the engine will be dis-
abled after about two seconds of operation. The Elec-
troMechanical Instrument Cluster (EMIC) will also
respond to the invalid key message on the PCI data
bus by flashing the SKIS indicator on and off.
Each Sentry Key has a unique transponder identi-
fication code permanently programmed into it by the
manufacturer. Likewise, the SKIM has a unique
Secret Key code programmed into it by the manufac-
turer. When a Sentry Key is programmed into the
memory of the SKIM, the SKIM stores the transpon-
der identification code from the Sentry Key, and the
Sentry Key learns the Secret Key code from the
SKIM. Once the Sentry Key learns the Secret Key
code of the SKIM, it is permanently stored in the
memory of the transponder. Therefore, once a Sentry
Key has been programmed to a particular vehicle, it
cannot be used on any other vehicle. (Refer to 8 -
ELECTRICAL/VEHICLE THEFT SECURITY -
STANDARD PROCEDURE - TRANSPONDER PRO-
GRAMMING).
VTSS INDICATOR
DESCRIPTION
The Vehicle Theft Security System (VTSS) indica-
tor consists of a red Light-Emitting Diode that is
mounted and integral to the automatic headlamp
light sensor photo diode unit, which is located on the
top of the instrument panel. The remainder of the
housing including the mount and the electrical con-
nection are concealed beneath the instrument panel
top cover.
The VTSS indicator cannot be adjusted or repaired
the entire automatic headlamp light sensor/VTSS
indicator must be replaced. (Refer to 8 - ELECTRI-
CAL/LAMPS/LIGHTING - EXTERIOR/AUTO HEAD-
LAMP SENSOR - REMOVAL).
Fig. 10 Sentry Key Immobilizer Transponder
1 - MOLDED CAP
2 - TRANSPONDER CHIP
3 - MOLDED CAP REMOVED
4 - TRANSPONDER KEY
WJVEHICLE THEFT SECURITY 8Q - 15
SKIS INDICATOR LAMP (Continued)

OPERATION
The Vehicle Theft Security System (VTSS) indica-
tor gives a visible indication of the VTSS arming sta-
tus. One side of Light-Emittiong Diode (LED) in the
VTSS indicator is connected to unswitched battery
current through a fused B(+) circuit and a fuse in the
Junction Block (JB). The other side of the LED is
hard wired to the Body Control Module (BCM), which
controls the operation of the VTSS indicator by pull-
ing this side of the LED circuit to ground. When the
VTSS arming is in progress, the BCM will flash the
LED rapidly on and off for about fifteen seconds.
When the VTSS has been successfully armed, the
BCM will flash the LED on and off continually at a
much slower rate until the VTSS has been disarmed.
The VTSS indicator can be diagnosed using conven-
tional diagnostic tools and methods.
DIAGNOSIS AND TESTING - VTSS INDICATOR
The diagnosis found here addresses an inoperative
Vehicle Theft Security System (VTSS) indicator con-
dition. If the problem being diagnosed is related to
indicator accuracy, be certain to confirm that the
problem is with the indicator and not with an inop-
erative VTSS. (Refer to 8 - ELECTRICAL/VEHICLE
THEFT SECURITY - DIAGNOSIS AND TESTING -
VEHICLE THEFT SECURITY SYSTEM). If no VTSS
problem is found, the following procedure will help to
locate a short or open in the VTSS indicator control
circuit. Refer to the appropriate wiring information.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
(1) Check the fused B(+) fuse in the Junction
Block (JB). If OK, go to Step 2. If not OK, repair the
shorted circuit or component and replace the faulty
fuse.
(2) Check for battery voltage at the fused B(+) fuse
in the JB. If OK, go to Step 3. If not OK, repair the
open fused B(+) circuit between the JB and the
Power Distribution Center (PDC).
(3) Disconnect and isolate the battery negative
cable. Disconnect the instrument panel wire harness
connector for the automatic headlamp light sensor/
VTSS indicator from the automatic headlamp light
sensor/VTSS indicator pigtail wire connector. Recon-
nect the battery negative cable. Check for battery
voltage at the fused B(+) circuit cavity of the instru-
ment panel wire harness connector for the automatic
headlamp light sensor/VTSS indicator. If OK, go to
Step 4. If not OK, repair the open fused B(+) circuit
between the VTSS indicator and the JB.
(4) Disconnect and isolate the battery negative
cable. Disconnect the instrument panel wire harness
connector for the JB from the JB connector recepta-
cle. Check for continuity between the VTSS indicator
driver circuit cavity of the instrument panel wire
harness connector for the automatic headlamp light
sensor/VTSS indicator and a good ground. There
should be no continuity. If OK, go to Step 5. If not
OK, repair the shorted VTSS indicator driver circuit
between the VTSS indicator and the JB.
(5) Check for continuity between the VTSS indica-
tor driver circuit of the instrument panel wire har-
ness connector for the automatic headlamp light
sensor/VTSS indicator and the instrument panel wire
harness connector for the JB. There should be conti-
nuity. If OK, replace the faulty VTSS indicator. If not
OK, repair the open VTSS indicator driver circuit
between the VTSS indicator and the JB.
8Q - 16 VEHICLE THEFT SECURITYWJ
VTSS INDICATOR (Continued)

WIPERS/WASHERS
TABLE OF CONTENTS
page page
FRONT WIPERS/WASHERS.................. 1REAR WIPERS/WASHERS.................. 33
FRONT WIPERS/WASHERS
TABLE OF CONTENTS
page page
FRONT WIPERS/WASHERS
DESCRIPTION..........................2
OPERATION............................4
DIAGNOSIS AND TESTING - FRONT WIPER &
WASHER SYSTEM.....................6
CLEANING - FRONT WIPER & WASHER
SYSTEM.............................8
INSPECTION - FRONT WIPER & WASHER
SYSTEM.............................8
FRONT CHECK VALVE
DESCRIPTION..........................9
OPERATION............................9
REMOVAL.............................9
INSTALLATION.........................10
FRONT WASHER HOSES/TUBES
DESCRIPTION.........................10
OPERATION...........................11
FRONT WASHER NOZZLE
DESCRIPTION.........................11
OPERATION...........................11
REMOVAL.............................11
INSTALLATION.........................11
FRONT WASHER PUMP/MOTOR
DESCRIPTION.........................12
OPERATION...........................12
REMOVAL.............................12
INSTALLATION.........................13
FRONT WIPER ARM
DESCRIPTION.........................13
OPERATION...........................13
REMOVAL.............................14
INSTALLATION.........................14
FRONT WIPER BLADE
DESCRIPTION.........................14
OPERATION...........................15
REMOVAL.............................15
INSTALLATION.........................15
FRONT WIPER MODULE
DESCRIPTION.........................16OPERATION...........................16
REMOVAL.............................17
INSTALLATION.........................17
RAIN SENSOR MODULE
DESCRIPTION.........................18
OPERATION...........................18
REMOVAL.............................19
INSTALLATION.........................19
RIGHT MULTI-FUNCTION SWITCH
DESCRIPTION.........................20
OPERATION...........................21
DIAGNOSIS AND TESTING - RIGHT MULTI-
FUNCTION SWITCH...................22
REMOVAL.............................24
INSTALLATION.........................24
WASHER FLUID LEVEL SWITCH
DESCRIPTION.........................25
OPERATION...........................25
REMOVAL.............................26
INSTALLATION.........................26
WASHER RESERVOIR
DESCRIPTION.........................27
OPERATION...........................27
REMOVAL.............................27
INSTALLATION.........................28
WIPER HIGH/LOW RELAY
DESCRIPTION.........................29
OPERATION...........................29
DIAGNOSIS AND TESTING - WIPER HIGH/
LOW RELAY.........................30
REMOVAL.............................30
INSTALLATION.........................30
WIPER ON/OFF RELAY
DESCRIPTION.........................31
OPERATION...........................31
DIAGNOSIS AND TESTING - WIPER ON/OFF
RELAY..............................32
REMOVAL.............................32
INSTALLATION.........................32
WJWIPERS/WASHERS 8R - 1

FRONT WIPERS/WASHERS
DESCRIPTION
An electrically operated intermittent front wiper
and washer system is standard factory-installed
safety equipment on this model (Fig. 1). The front
wiper and washer system includes the following
major components, which are described in further
detail elsewhere in this service information:²Body Control Module- The Body Control
Module (BCM) is located on the Junction Block (JB)
under the driver side outboard end of the instrument
panel. (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/BODY CONTROL MODULE
- DESCRIPTION).
Fig. 1 Front Wiper & Washer System
1 - WASHER RESEVOIR FILLER TUBE
2 - WASHER RESERVOIR, PUMP/MOTOR, FLUID LEVEL
SWITCH
3 - WASHER NOZZLE (2)
4 - WIPER MODULE5 - WIPER ARM & BLADE (2)
6 - RIGHT (WIPER) MULTI-FUNCTION SWITCH RIGHT
7 - RAIN SENSOR MODULE
8R - 2 FRONT WIPERS/WASHERSWJ

²Front Check Valve- The front washer system
check valve is integral to the wye fitting located in
the washer plumbing between the cowl plenum
washer hose and the front washer nozzles, and is
concealed beneath the cowl plenum cover/grille panel
at the base of the windshield.
²Front Washer Nozzle- Two fluidic front
washer nozzles are secured with integral snap fea-
tures to dedicated openings in the cowl plenum cover/
grille panel located near the base of the windshield.
²Front Washer Plumbing- The plumbing for
the front washer system consists of rubber hoses and
molded plastic fittings. The plumbing is routed along
the left side of the engine compartment from the
washer reservoir, and through the dash panel into
the cowl plenum to the front washer nozzle fittings
beneath the cowl plenum cover/grille panel.
²Front Washer Pump/Motor- The front washer
pump/motor unit is located in a dedicated hole on the
lower outboard side of the washer reservoir, behind
the inner fender liner ahead of the left front wheel.
The front washer pump is located ahead of and below
the rear washer pump.
²Front Wiper Arm- The two front wiper arms
are secured with nuts to the threaded studs on the
ends of the two wiper pivot shafts, which extend
through the cowl plenum cover/grille panel located
near the base of the windshield.
²Front Wiper Blade- The two front wiper
blades are secured to the two front wiper arms with
an integral latch, and are parked on the glass near
the bottom of the windshield when the front wiper
system is not in operation.
²Front Wiper Module- The front wiper pivot
shafts are the only visible components of the front
wiper module. The remainder of the module is con-
cealed within the cowl plenum beneath the cowl ple-
num cover/grille panel. The front wiper module
includes the module bracket, four rubber-isolated
wiper module mounts, the front wiper motor, the
wiper motor crank arm, the two wiper drive links,
and the two front wiper pivots.
²Rain Sensor Module- Models equipped with
the optional automatic wiper feature have a Rain
Sensor Module (RSM) located behind a trim cover on
a bracket bonded to the inside surface of the wind-
shield glass, just above the inside rear view mirror
mounting button.
²Right Multi-Function Switch- The right
(wiper) multi-function switch is secured to the right
side of the multi-function switch mounting housing
near the top of the steering column, just below the
steering wheel. Only the control stalk for the right
multi-function switch is visible, while the remainder
of the switch is concealed beneath the steering col-
umn shrouds. The right multi-function switch con-tains all of the switches and control circuitry for both
the front and rear wiper and washer systems.
²Washer Fluid Level Switch- The washer fluid
level switch is located in a dedicated hole near the
center of the forward surface of the washer reservoir,
behind the left front wheel house splash shield.
²Washer Reservoir- The washer reservoir is
concealed between the left inner fender shield and
the left outer fender panel, behind the inner fender
liner and ahead of the left front wheel. The washer
reservoir filler neck is the only visible portion of the
reservoir, and it is accessed from the left front corner
of the engine compartment.
²Wiper High-Low Relay- The wiper high-low
relay is an International Standards Organization
(ISO) micro relay located in the Power Distribution
Center (PDC) in the engine compartment near the
battery.
²Wiper On-Off Relay- The wiper on-off relay is
an International Standards Organization (ISO) micro
relay located in the Power Distribution Center (PDC)
in the engine compartment near the battery.
Hard wired circuitry connects the front wiper and
washer system components to the electrical system of
the vehicle. These hard wired circuits are integral to
several wire harnesses, which are routed throughout
the vehicle and retained by many different methods.
These circuits may be connected to each other, to the
vehicle electrical system and to the front wiper and
washer system components through the use of a com-
bination of soldered splices, splice block connectors,
and many different types of wire harness terminal
connectors and insulators. Refer to the appropriate
wiring information. The wiring information includes
wiring diagrams, proper wire and connector repair
procedures, further details on wire harness routing
and retention, as well as pin-out and location views
for the various wire harness connectors, splices and
grounds.
OPERATING MODES
The components of the front wiper and washer sys-
tem are designed to work in concert to provide the
following operating modes:
²Automatic Wiper- In models equipped with
the optional automatic wiper feature, the internal
circuitry of both the right (wiper) multi-function
switch, the rain sensor module, and the BCM work
in concert to provide an automatic wiper mode with
five sensitivity selections. The BCM tells the Rain
Sensor Module (RSM) when the automatic wiper
mode is selected and the manually selected sensitiv-
ity level, then the rain sensor module tells the BCM
each time enough water droplets have accumulated
within the wipe pattern on the windshield to require
front wiper operation. The BCM then automatically
WJFRONT WIPERS/WASHERS 8R - 3
FRONT WIPERS/WASHERS (Continued)

operates the front wipers at the programmed speed
and intervals requested by the RSM to maintain vis-
ibility through the windshield.
²Continuous Wipe Mode- The control knob on
the control stalk of the right (wiper) multi-function
switch has two continuous wipe positions, Low and
High. When selected, these switch positions will
cause the two-speed front wiper motor to operate in a
continuous low or high speed cycle.
²Headlamps On With Wipers- The BCM pro-
vides an automatic headlamps on with wipers feature
for models equipped with the optional automatic
headlamps. This is a customer programmable fea-
ture. If this feature is enabled, the headlamps will
turn on automatically when the windshield wipers
are turned on; and, if the headlamps were turned on
automatically when the wipers were turned on, they
will turn off automatically when the wipers are
turned off. In models equipped with the optional
automatic wiper feature, when the automatic wiper
mode is selected the headlamps will turn on auto-
matically only after the wipers complete three auto-
matic wipe cycles within about thirty seconds, and
they will turn off automatically after three minutes
elapse without any automatic wipe cycles. (Refer to 8
- ELECTRICAL/OVERHEAD CONSOLE - STAN-
DARD PROCEDURE - ELECTRONIC VEHICLE
INFORMATION CENTER PROGRAMMING).
²Mist Wipe Mode- The control stalk of the right
(wiper) multi-function switch has a momentary Mist
position. When selected, this switch position will
operate the front wipers in a low speed continuous
cycle for as long as the switch is held closed, then
will complete the current wipe cycle and park the
front wiper blades near the base of the windshield
when the switch is released.
²Speed Sensitive Intermittent Wipe Mode-
Except on models equipped with the optional auto-
matic wiper system, the internal circuitry of both the
right (wiper) multi-function switch and the BCM
work in concert to provide an intermittent wipe mode
with five delay interval selections. The BCM auto-
matically adjusts each manually selected delay inter-
val to compensate for vehicle speed.
²Washer Mode- When the momentary front
wash position of the control stalk for the right
(wiper) multi-function switch is selected with the
front wiper system operating in a continuous wipe
mode, washer fluid will be dispensed onto the wind-
shield glass through the washer nozzles for as long
as the washer switch is held closed. When the front
washer switch is actuated with the front wiper sys-
tem operating in an intermittent wipe mode, washer
fluid is still dispensed until the switch is released;
however, the front wipers will operate in a low speed
continuous cycle from the time the washer switch isclosed until several wipe cycles after the switch is
released, before returning to the selected intermit-
tent wipe mode.
²Wipe-After-Wash Mode- When the momentary
front wash position of the control stalk for the right
(wiper) multi-function switch is selected with the
front wiper system turned Off, the internal circuitry
of the BCM provides a wipe-after-wash feature.
When selected, this feature will operate the front
washer pump/motor and the front wipers for as long
as the front washer switch is held closed, then pro-
vide several additional wipe cycles after the switch is
released before parking the front wiper blades near
the base of the windshield.
OPERATION
The front wiper and washer system is designed to
provide the vehicle operator with a convenient, safe,
and reliable means of maintaining visibility through
the windshield glass. The various components of this
system are designed to convert electrical energy pro-
duced by the vehicle electrical system into the
mechanical action of the wiper blades to wipe the
outside surface of the glass, as well as into the
hydraulic action of the washer system to apply
washer fluid stored in an on-board reservoir to the
area of the glass to be wiped. When combined, these
components provide the means to effectively main-
tain clear visibility for the vehicle operator by remov-
ing excess accumulations of rain, snow, bugs, mud, or
other minor debris that might be encountered while
driving the vehicle under numerous types of inclem-
ent operating conditions from the outside windshield
glass surface.
The vehicle operator initiates all front wiper and
washer system functions with the control stalk of the
right (wiper) multi-function switch that extends from
the right side of the steering column, just below the
steering wheel. Rotating the control knob on the end
of the right (wiper) multi-function switch control
stalk selects the Off, Delay (on models not equipped
with the optional automatic wiper system), Auto (on
models equipped with the optional automatic wiper
system), Low, or High front wiper system operating
modes. In the Delay mode, the control knob also
allows the vehicle operator to select from one of five
intermittent wipe Delay intervals. In the Auto mode,
the control knob also allows the vehicle operator to
select from one of five automatic wiper sensitivity
levels. Pulling the right control stalk downwards
actuates the momentary front wiper system Mist
mode switch, while pulling the right control stalk
towards the steering wheel actuates the front washer
system switch. The multi-function switch provides
hard wired resistor multiplexed inputs to the Body
Control Module (BCM) for all of the front wiper sys-
8R - 4 FRONT WIPERS/WASHERSWJ
FRONT WIPERS/WASHERS (Continued)