A customer programmable feature option affecting
the windshield wiper and washer system is: Head-
lamps On With Wipers - This feature is only avail-
able on models that are also equipped with the Auto
Headlamps option. If this feature is enabled, the
headlamps will turn on automatically when the
windshield wipers are turned on; and, if the head-
lamps were turned on automatically when the wipers
were turned on, they will turn off automatically
when the wipers are turned off.
The windshield wiper and washer system includes
the following components:
• Washer fluid level sensor
• Washer reservoir and pump
• Windshield washer nozzle and plumbing
• Windshield wiper arm and blade
• Windshield wiper motor, linkage and pivot mod-
ule
• Wiper and washer (right multi-function) switch
• Wiper high/low relay
• Wiper on/off relay.
Certain functions and features of the windshield
wiper and washer systems rely upon resources
shared with other electronic modules in the vehicle
over the Programmable Communications Interface
(PCI) data bus network. The PCI data bus network
allows the sharing of sensor information. This helps
to reduce wire harness complexity, internal controller
hardware, and component sensor current loads. At
the same time, this system provides increased reli-
ability, enhanced diagnostics, and allows the addition
of many new feature capabilities. For diagnosis of
these electronic modules or of the PCI data bus net-
work, the use of a DRB scan tool and the proper
Diagnostic Procedures manual are recommended.
The other electronic modules that may affect wind-
shield wiper and washer system operation are as fol-
lows:
• Body Control Module (BCM) - Refer to Body
Control Module in the Description and Operation
section of Group 8E - Instrument Panel Systems for
more information.
•
Electronic
Vehicle
Information
Center
(EVIC) - Refer to Electronic Vehicle Information
Center in the Description and Operation section of
Group 8V - Overhead Console Systems for more
information.
• Powertrain Control Module (PCM) - Refer
to Powertrain Control Module in the Description
and Operation section of Group 14 - Fuel System for
more information.
Refer to Wipers in the Contents of Group 8W -
Wiring Diagrams for complete circuit diagrams. Fol-
lowing are general descriptions of the major compo-
nents in the windshield wiper and washer systems.
OPERATION
The vehicle operator selects the desired windshield
wiper and washer system functions using the wiper
and washer (right multi-function) switch, which is
located on the right side of the steering column. The
right multi-function switch provides hard wired resis-
tor multiplexed inputs to the BCM for all wiper sys-
tem functions, except for the high speed wiper motor
operation. The high speed wiper motor windings are
activated by the wiper high/low relay when the relay
control coil is energized through a direct hard wired
circuit from the right multi-function switch.
The BCM also is provided with hard wired input
from the wiper motor park switch and the windshield
washer pump control circuit, along with message
inputs received over the PCI data bus from other
electronic modules in the vehicle. The BCM uses
these inputs and its internal programming to control
all other windshield wiper system functions. The
BCM controls the low speed wiper motor windings
through control outputs to and through the wiper
on/off relay. The BCM uses this control of the low
speed wiper motor windings to provide the low speed,
intermittent, mist, wipe-after-wash and park func-
tions for the windshield wiper system.
The windshield washer system is controlled by a
direct hard wired battery current feed from the right
multi-function switch to the front washer pump. The
BCM monitors this circuit through a hard wired
input so that it can provide low speed wiper opera-
tion to coincide with washer pump operation and the
wipe-after-wash feature.
See the owner’s manual in the vehicle glove box for
more information on the features, use and operation
of the windshield wiper and washer systems.
REAR WIPER AND WASHER SYSTEM
DESCRIPTION
An electrically operated intermittent rear wiper
and washer system is standard factory-installed
equipment on this model. The driver controls all
front and rear wiper and washer system functions
with the switches that are integral to the wiper and
washer (right multi-function) switch mounted on the
right side of the steering column. The rear wiper and
washer systems are controlled by ignition switched
battery current through a fuse in the junction block,
and will operate only when the ignition switch is in
the Accessory or On positions.
The intermittent rear wiper and washer system
allows the driver to select from a continuous fixed-cy-
cle wipe or an intermittent wipe mode. This system
also has a wipe-after-wash feature that operates the
rear wiper for as long as the washer pump is ener-
gized, then provides about three additional sweeps of
8K - 2
WIPER AND WASHER SYSTEMS
WJ
DESCRIPTION AND OPERATION (Continued)