tory-installed safety equipment on this model. The
front wiper and washer system is an electrically
operated intermittent system that utilizes major com-
ponents:

• Body Control Module - The Body Control

Module (BCM) is located on the bulkhead under the
driver side end of the instrument panel. (Refer to 8 -
ELECTRICAL/ELECTRONIC

CONTROL

MOD-

ULES/BODY

CONTROL

MODULE

DESCRIP-

TION).

• 9 Integrated Power Module - The Integrated

Power Module (IPM) is located in the engine com-
partment on the driver side next to the battery. The
IPM receives messages over the Progammable Com-
munication Interface (PCI) bus from the BCM and
uses the information to appropriately control the
front wiper functions and both the front and rear
washer motors. The IPM does not control the rear

wiper functions except for the rear washer pump
motor.

• Front Check Valve - The front washer system

check valve is integral to the wye (Y) fitting located
on the underside of the hood panel.

• Front Washer Nozzle - Two fluidic front

washer nozzles are secured with integral snap fea-
tures to dedicated openings in the hood panel, toward
the rearward edge.

• Front Washer Plumbing - The plumbing for

the front washer system consists of rubber hoses and
molded plastic fittings. The plumbing is routed along
the right side of the engine compartment from the
washer reservoir, and up to the hood panel to the
front washer nozzle fittings.

• Front 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.

• Front 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.

WIPERS/WASHERS

8R - 1

• Front 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.

• Front 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 wiper module bracket, four rubber-iso-
lated wiper module mounts, the front wiper motor,
the wiper motor crank arm, the two wiper drive
links, and the two front wiper pivots.

• Right 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.

• Washer 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.

OPERATING MODES

The components of the front wiper and washer sys-

tem are designed to provide the following operating
modes:

• Continuous 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 pro-
vide input to the BCM which will in turn send a bus
message to the IPM to operate the two-speed front
wiper motor to operate in a continuous low or high
speed cycle.

• Headlamps On With Wipers Mode - The BCM

provides an automatic headlamps on with wipers fea-
ture. This is a customer programmable feature. If
this feature is enabled, the headlamps will turn on
automatically whenever the windshield wipers are
turned on; and, if the headlamps were turned on
automatically when the wipers were turned on, they
will also turn off automatically when the wipers are
turned off. If this feature is enabled, when the auto-
matic wiper mode is selected the headlamps will turn
on automatically only after the wipers complete three
automatic wipe cycles within about thirty seconds,

and they will turn off automatically after three min-
utes elapse without any automatic wipe cycles (Refer
to 8 - ELECTRICAL/OVERHEAD CONSOLE/ELEC-
TRONIC VEHICLE INFO CENTER - STANDARD
PROCEDURE - ELECTRONIC VEHICLE INFOR-
MATION CENTER PROGRAMMING).

• Mist Wipe Mode - The control stalk of the right

(wiper) multi-function switch has a momentary Mist
position. When selected, this switch position will pro-
vide input to the BCM which will in turn send a bus
message to the IPM to 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.

• Speed Sensitive Intermittent Wipe Mode -

The internal circuitry of both the right (wiper) multi-
function switch, the BCM and the IPM provide an
intermittent wipe mode with five delay interval selec-
tions. When this mode is selected, the BCM sends a
bus message to the IPM to automatically adjusts
each of the five manually selected delay intervals
between complete wipe cycles to compensate for vehi-
cle speed.

• Washer 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 is
closed until several wipe cycles after the switch is
released, before returning to the selected intermit-
tent wipe mode.

• Wipe-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 BCM provides a
message to the IPM to operate the 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
provide several additional wipe cycles after the
switch is released before parking the front wiper
blades near the base of the windshield.

REAR WIPER AND WASHER SYSTEM

An electrically operated fixed interval intermittent

rear wiper and washer system includes major compo-
nents:

8R - 2

WIPERS/WASHERS

WIPERS/WASHERS (Continued)

• Rear Washer Nozzle - The rear washer nozzle

is secured by a snap fit into a mounting hole in the
liftgate spoiler assembly, above the liftgate glass. The
check valve is mounting in line between the liftgate
opening and liftgate.

• Rear Washer Plumbing - The plumbing for

the rear 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, through the dash into the passen-
ger compartment, down the right side, up the right
D-pillar, to the rear roof header. The plumbing is
then routed through grommets in the rear roof
header and the liftgate inner panel, then into the lift-
gate spoiler assembly to the fitting for the rear
washer nozzle.

• Rear Washer Pump/Motor - The rear washer

pump/motor is located in a dedicated hole on the
lower outboard side of the washer reservoir, ahead of
the left front wheel housing. The rear washer pump
mounting hole is located higher on the reservoir than
the front washer pump mounting hole.

• Rear Wiper Arm - The single rear wiper arm is

secured by a nut directly to the rear wiper motor out-
put shaft, which extends through the center of the
liftgate outer panel near the base of the liftgate
glass.

• Rear Wiper Blade - The single rear wiper

blade is secured to the rear wiper arm with an inte-
gral latch, and is parked off of the liftgate flip-up
glass when the rear wiper system is not in operation.

• Rear Wiper Motor - The rear wiper motor out-

put shaft is the only visible component of the rear
wiper motor. The remainder of the motor is concealed
within the liftgate.

• Right 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. The remainder of the
switch is concealed beneath the steering column
shrouds. The right multi-function switch control stalk
is dedicated to providing all of the driver controls for
both the front and rear wiper and washer systems.

• Washer Reservoir - The rear washer system

shares a single reservoir with the front washer sys-
tem, but has its own dedicated washer pump/motor
and plumbing. 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.

OPERATING MODES

The components of the rear wiper and washer sys-

tem are designed to work in concert to provide the
following operating modes:

• Continuous Wipe Mode - When the right

multi-function switch control sleeve is moved to the
On position, the rear wiper will be operated at a
fixed speed, continual wipe cycle until the switch
sleeve is moved to the Delay or Off positions or until
the ignition switch is turned to the Off position.

• Intermittent Wipe Mode - When the right

multi-function switch control sleeve is moved to the
Delay position, the rear wiper will be operated in a
fixed interval, intermittent wipe cycle until the
switch sleeve is moved to the On or Off positions,
until the ignition switch is turned to the Off position,
or until the right multi-function switch control stalk
is pushed forward to activate the rear washer sys-
tem. The intermittent wipe mode delay time has a
fixed delay interval of about five to eight seconds
between sweeps.

• Washer Mode - When the right multi-function

switch control stalk is pushed forward to activate the
rear washer system, the BCM will send a bus mes-
sage to the IPM to turn on the rear washer pump
motor and washer fluid will be dispensed from the
washer reservoir onto the liftgate glass through the
rear washer nozzle and the rear wiper will operate in
a fixed cycle (not intermittent) for as long as the rear
washer pump/motor unit remains energized.

• Wipe-After-Wash Mode - When the right

multi-function switch control stalk is released from
the momentary Wash position, the wipe-after-wash
feature will continue to operate the rear wiper at a
fixed cycle for about three additional wiper sweeps
before returning to the previously selected mode.

OPERATION

FRONT WIPER/WASHER SYSTEM

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 control stalk selects the Off, Delay, 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. Pulling the right control stalk down-
wards actuates the momentary front wiper system
Mist mode switch, while pulling the right control
stalk

towards

the

steering

wheel

actuates

the

momentary front washer system switch. The right
multi-function switch provides hard wired resistor
multiplexed inputs to the Body Control Module

WIPERS/WASHERS

8R - 3

WIPERS/WASHERS (Continued)

(BCM) for all of the front wiper system functions, as
well as separate hard wired sense inputs to the BCM
for the high speed continuous wipe and front washer
system functions. The BCM in turn sends a bus mes-
sage to the IPM to activate the front wiper low
speed, high speed , 5 intermittent wipe delays, wipe
after wash, mist function and the washer pumps for
both the front and rear wiper systems.

The front wiper and washer system will only oper-

ate when the ignition switch is in the Accessory or
On positions. Battery current is directed from a B(+)
fuse in the Integrated Power Module (IPM) to the
wiper and washer system fused ignition switch out-
put (run-acc) circuit. The right multi-function switch
circuitry uses this battery feed to send a PCI data
bus message to the BCM which will then pass it on
the IPM to energize the front wipers/washers.

When diagnosing the front wiper/washer system,

use of a DRBIII

t scan tool and refer to the appropri-

ate Body Diagnostic Procedures manual.

FRONT WIPER/WASHER OPERATING MODES

CONTINUOUS WIPE MODE

When the Low position of the control knob on the

control stalk of the right (wiper) multi-function
switch is selected, the Body Control Module (BCM)
sends a PCI data bus message to the IPM to energize
the wiper motor. This directs battery current through
low speed brush of the front wiper motor, causing the
front wipers to cycle at low speed. When the High
position of the control knob is selected, the BCM
sends a PCI data bus message to the IPM to energize
the wiper motor. This directs battery current through
the high speed brush of the front wiper motor, caus-
ing the front wipers to cycle at high speed.

When the Off position of the control knob is

selected, the BCM sends a PCI data bus message to
the IPM to de-energize the wiper motor, then one of
two events will occur. The event that will occur
depends upon the position of the wiper blades on the
windshield at the moment that the control knob Off
position is selected. If the wiper blades are in the
down position on the windshield when the Off posi-
tion is selected, the park switch that is integral to
the front wiper motor is closed to ground and the
wiper motor ceases to operate.

If the wiper blades are not in the down position on

the windshield at the moment the Off position is
selected, the park switch is closed to battery current
from the fused ignition switch output (run-acc) cir-
cuit of the front wiper motor. The park switch directs
this battery current to the low speed brush of the
wiper motor through the wiper park switch sense cir-
cuit. This causes the wiper motor to continue run-
ning at low speed until the wiper blades are in the

down position on the windshield and the park switch
is again closed to ground.

INTERMITTENT WIPE MODE

When the control knob on the control stalk of the

right (wiper) multi-function switch is moved to one of
the five Delay interval positions, the BCM electronic
intermittent wipe logic circuit responds by calculat-
ing the correct length of time between wiper sweeps
based upon the selected delay interval input. The
BCM monitors the changing state of the wiper motor
park switch through a hard wired front wiper park
switch sense circuit input. This input allows the
BCM to determine the proper intervals at which to
send the PCI data bus message to the IPM to ener-
gize and de-energize the front wiper motor intermit-
tently for one low speed cycle at a time.

The BCM logic is also programmed to provide an

immediate wipe cycle and begin a new delay interval
timing cycle each time a shorter delay interval is
selected, and to add the remaining delay timing
interval to the new delay interval timing before the
next wipe cycle occurs each time a longer delay inter-
val is selected. The intermittent wipe mode delay
times are speed sensitive. The BCM monitors vehicle
speed messages received from the Powertrain Control
Module (PCM) over the PCI data bus in order to pro-
vide the speed sensitive delay intervals. Above about
sixteen kilometers-per-hour (ten miles-per-hour) the
delay is driver adjustable from about one-half second
to about eighteen seconds. Below about sixteen kilo-
meters-per-hour (ten miles-per-hour) the delay times
are doubled, from about one second to about thirty-
six seconds.

MIST WIPE MODE

When the control stalk of the right (wiper) multi-

function switch is moved to the momentary Mist
position, the BCM sends a bus message to the IPM to
energizes the wiper on/off relay for as long as the
Mist switch is held closed, then de-energizes the
relay when the state of the Mist switch input
changes to open. The BCM can operate the front
wiper motor in this mode for only one low speed cycle
at a time, or for an indefinite number of sequential
low speed cycles, depending upon how long the Mist
switch is held closed.

WASH MODE

When the control stalk of the right (wiper) multi-

function switch is moved to the momentary front
Wash position while the control knob is in the Low or
High positions, the BCM receives this information
and sends a bus message to the IPM to turn on the
front washer pump/motor unit. This will cause the
front washer pump/motor unit to be energized for as

8R - 4

WIPERS/WASHERS

WIPERS/WASHERS (Continued)

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