Diagnosis And Testing - Front Wiper & Washer System - Chrysler Vehicle User Manual

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FRONT WIPERS/WASHERS (Continued)
val. The logic circuit then energizes the wiper motor
relay by pulling the relay control coil to ground. The
energized wiper motor relay directs battery current
from the normally open relay terminal through the
common feed relay terminal and the Delay mode
wiper switch circuitry to the low speed brush of the
wiper motor. The logic circuit monitors the front
wiper motor operation through the wiper park switch
sense circuit, which allows the logic circuit to deter-
mine the proper timing to begin the next wiper blade
sweep.
MIST MODE
When the control stalk of the right multi-function
switch is moved to the momentary Mist position, the
Mist mode circuitry within the switch directs battery
current to the low speed brush of the front wiper
motor, which causes the front wipers to cycle at low
speed for as long as the switch is held in the Mist
position. When the control stalk is released, the
wiper motor completes the current wipe cycle then
parks the wiper blades near the base of the wind-
shield.
WASH MODE
When the momentary Wash position of the right
multi-function switch control stalk is selected while
the front wiper system is operating, the Wash mode
circuitry within the switch directs battery current to
the front washer pump/motor for as long as the Wash
mode circuitry within the switch remains closed.
When the control stalk is released the Wash mode
circuitry within the switch opens and the front
washer pump/motor ceases operation.
WIPE-AFTER-WASH MODE
When the washer switch is closed with the front
wiper system turned Off, the intermittent wipe logic
circuit operates the front wiper motor through the
wiper motor relay in the same manner as it does to
provide the Delay mode operation, but uses the Off
mode circuitry of the wiper switch to feed battery
current to the low speed brush of the front wiper
motor. When the Wash mode circuitry state changes
to open, the intermittent wipe logic circuit de-ener-
gizes the front washer pump/motor unit, but allows
the wiper motor to operate for several additional
wipe cycles before it de-energizes the wiper motor
and parks the wiper blades near the base of the
windshield. The intermittent wipe logic circuit moni-
tors the front wiper motor through the wiper park
switch sense circuit, which allows the logic circuit to
count the number of wiper blade sweeps.
FRONT WIPERS/WASHERS
DIAGNOSIS AND TESTING - FRONT WIPER &
WASHER SYSTEM
WIPER SYSTEM
The diagnosis found here addresses an electrically
inoperative front wiper system. If the front wiper
motor operates, but the wipers do not move on the
windshield, replace the faulty front wiper module. If
the wipers operate, but chatter, lift, or do not clear
the glass, clean and inspect the front wiper system
components as required. (Refer to 8 - ELECTRICAL/
FRONT WIPERS/WASHERS - CLEANING) and
(Refer to 8 - ELECTRICAL/FRONT WIPERS/WASH-
ERS - INSPECTION). Refer to the appropriate wir-
ing information. The wiring information includes
wiring diagrams, proper wire and connector repair
procedures, details of wire harness routing and
retention, connector pin-out information and location
views for the various wire harness connectors, splices
and grounds.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE SUPPLEMENTAL RESTRAINT
SYSTEM BEFORE ATTEMPTING ANY STEERING
WHEEL, STEERING COLUMN, DRIVER AIRBAG,
PASSENGER AIRBAG, OR INSTRUMENT PANEL
COMPONENT DIAGNOSIS OR SERVICE. DISCON-
NECT AND ISOLATE THE BATTERY NEGATIVE
(GROUND) CABLE, THEN WAIT TWO MINUTES FOR
THE SYSTEM CAPACITOR TO DISCHARGE BEFORE
PERFORMING FURTHER DIAGNOSIS OR SERVICE.
THIS IS THE ONLY SURE WAY TO DISABLE THE
SUPPLEMENTAL RESTRAINT SYSTEM. FAILURE TO
TAKE THE PROPER
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Check the front wiper and washer system fuse
(Fuse 14 - 25 ampere) in the fuse block. If OK, go to
Step 2. If not OK, repair the shorted circuit or com-
ponent as required and replace the faulty fuse.
(2) Turn the ignition switch to the On position.
Check for battery voltage at the front wiper and
washer system fuse (Fuse 14 - 25 ampere) in the fuse
block. If OK, go to Step 3. If not OK, repair the open
fused ignition switch output (run-acc) circuit between
the fuse block and the ignition switch as required.
(3) Disconnect and isolate the battery negative
cable. Disconnect the body wire harness connector for
the right multi-function switch from the switch con-
nector receptacle. Check for continuity between the
ground circuit cavity of the body wire harness con-
nector for the right multi-function switch and a good
ground. There should be continuity. If OK, go to Step
4. If not OK, repair the open ground circuit to ground
(G300) as required.
8R - 5
PRECAUTIONS COULD