Chrysler Vehicle User Manual page 559

8R - 4 FRONT WIPERS/WASHERS
FRONT WIPERS/WASHERS (Continued)
tain clear visibility for the vehicle operator by remov-
ing excess accumulations of rain, snow, bugs, mud, or
other minor debris from the outside windshield glass
surface that might be encountered while driving the
vehicle under numerous types of inclement operating
conditions.
The vehicle operator initiates all front wiper and
washer system functions with the control stalk and
control knob of the right multi-function switch that
extends from the right side of the steering column,
just below the steering wheel. Moving the control
stalk upward selects the front wiper system operat-
ing mode. The front wiper system allows the vehicle
operator to select from two continuous wiper speeds,
High or Low, or the intermittent wipe Delay mode.
Pulling the control stalk downwards and releasing it
selects the front wiper system Mist mode, which
operates the front wipers for one complete wipe cycle
after the control stalk is released. Rotating the con-
trol knob on the end of the control stalk allows the
vehicle operator to select the intermittent wipe Delay
interval. Pulling the control stalk towards the steer-
ing wheel activates the front washer pump/motor,
which dispenses washer fluid onto the windshield
glass through the front washer nozzle.
When the ignition switch is in the Accessory or On
positions, battery current from a fuse in the Power
Distribution Center (PDC) is provided to the front
wiper and washer system fuse in the fuse block. This
fuse provides battery current through separate fused
ignition switch output (run-acc) circuits to the right
multi-function switch, and to the front wiper motor.
Within the right multi-function switch, this battery
current is fed to one side of the control coil in the
wiper motor relay, and to the electronic intermittent
wipe logic circuit, which are both integral to the
switch.
The intermittent wipe and wipe-after-wash fea-
tures of the front wiper and washer system are both
provided by the electronic intermittent wipe logic cir-
cuit within the right multi-function switch. In order
to provide the intermittent wipe feature, the logic cir-
cuit monitors the wiper switch state, the intermittent
delay resistance setting, and the wiper motor park
switch state. In order to provide the wipe-after-wash
feature, the logic circuit monitors both the front
washer switch state and the wiper motor park switch
state.
The hard wired circuits and components of the
front wiper and washer system may be diagnosed
and tested using conventional diagnostic tools and
procedures. However, conventional diagnostic meth-
ods are not possible in the diagnosis of the intermit-
tent wipe mode circuitry and logic within the right
multi-function switch. If the front wiper and washer
system operates satisfactorily in all modes except the
Delay mode, the faulty right multi-function switch
must be replaced. Refer to the appropriate diagnostic
information.
OPERATING MODES
Following are paragraphs that briefly describe the
operation of each of the front wiper and washer sys-
tem operating modes.
CONTINUOUS WIPE MODE
When the Low position of the right multi-function
switch control stalk is selected, the Low mode cir-
cuitry within the switch directs battery current to
the low speed brush of the front wiper motor, which
causes the front wipers to cycle at a low speed. When
the High position of the control stalk is selected, the
High mode circuitry within the switch directs battery
current to the high speed brush of the front wiper
motor, which causes the front wipers to cycle at a
high speed.
When the Off position of the right multi-function
switch control stalk is selected, one of two events is
possible. The event that occurs depends upon the
position of the wiper blades on the windshield at the
moment that the control stalk Off position is
selected. If the wiper blades are in the down position
on the windshield when the Off position 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
through the fused ignition switch output (run-acc)
circuit of the front wiper motor. The park switch
sense circuit directs this battery current to the low
speed brush of the wiper motor through the normally
closed circuit of the wiper motor relay and the Off
mode circuitry of the wiper switch. This causes the
wiper motor to continue running 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 stalk of the right multi-function
switch is moved to the Delay position, the Delay
mode circuitry within the switch directs battery cur-
rent to a request input of the integral logic circuit.
The Delay mode circuitry also directs battery current
through an internal variable resistor to the intermit-
tent wipe delay sense input of the logic circuit, which
indicates the delay interval that has been selected by
the vehicle operator using the control knob on the
end of the right multi-function switch control stalk.
The logic circuit responds to the Delay mode
request inputs by calculating the correct delay inter-
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