Content .. 331 332 333 334 ..

Jeep Wrangler TJ. Manual - part 333

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.

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:

AVOID

PERSONAL

INJURY

DEATH, ON VEHICLES EQUIPPED WITH AIRBAGS,
DISABLE THE SUPPLEMENTAL RESTRAINT SYS-
TEM

BEFORE

ATTEMPTING

ANY

STEERING

WHEEL, STEERING COLUMN, AIRBAG, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE SYSTEM CAPACITOR TO DIS-
CHARGE BEFORE PERFORMING FURTHER DIAG-
NOSIS OR SERVICE. THIS IS THE ONLY SURE WAY
TO DISABLE THE SUPPLEMENTAL RESTRAINT
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT.

(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.

(4) Reconnect the battery negative cable. Turn the

ignition switch to the On position. Check for battery
voltage at the fused ignition switch output (run-acc)
circuit cavity of the body wire harness connector for
the right multi-function switch. If OK, go to Step 5.
If not OK, repair the open fused ignition switch out-

FRONT WIPERS/WASHERS

8R - 5

FRONT WIPERS/WASHERS (Continued)

put (run-acc) circuit between the right multi-function
switch and the fuse block as required.

(5) Turn the ignition switch to the Off position.

Disconnect and isolate the battery negative cable.
Remove the right multi-function switch from the
steering column and check the switch continuity.
(Refer to 8 - ELECTRICAL/FRONT WIPERS/WASH-
ERS/RIGHT MULTI-FUNCTION SWITCH - DIAG-
NOSIS AND TESTING). If OK, go to Step 6. If not
OK, replace the faulty switch.

(6) Disconnect the body wire harness connector for

the front wiper motor from the wiper motor pigtail
wire connector. Check for continuity between the
ground circuit cavity in the body wire harness con-
nector for the front wiper motor and a good ground.
There should be continuity. If OK, go to Step 7. If not
OK, repair the open ground circuit to ground (G300)
as required.

(7) Reconnect the battery negative cable. Turn the

ignition switch to the On position. Check for battery
voltage at the fused ignition switch output (run-acc)
circuit cavity of the body wire harness connector for
the front wiper motor. If OK, go to Step 8. If not OK,
repair the open fused ignition switch output (run-acc)
circuit between the front wiper motor and the fuse
block as required.

(8) Turn the ignition switch to the Off position.

Disconnect and isolate the battery negative cable.
The body wire harness connector for the right multi-
function switch is still disconnected. Check each of
the following circuits at the proper cavity of the body
wire harness connector for the front wiper motor for
continuity to ground. In each case, there should be
no continuity. If OK, go to Step 9. If not OK, repair
the shorted circuit between the front wiper motor
and the right multi-function switch as required.

• Wiper park switch sense

• Wiper switch low speed output

• Wiper switch high speed output
(9) Check the continuity of each of the following

circuits between the proper cavities of the body wire
harness connectors for the front wiper motor and the
right multi-function switch. In each case, there
should be continuity. If OK, replace the faulty front
wiper module. If not OK, repair the open circuit
between the front wiper motor and the right multi-
function switch as required.

• Wiper park switch sense

• Wiper switch low speed output

• Wiper switch high speed output

WASHER SYSTEM

The diagnosis found here addresses an electrically

inoperative front washer system. If the front washer
pump/motor operates, but no washer fluid is emitted
from the washer nozzle, be certain to check the fluid

level in the reservoir. Also clean and inspect the front
washer system components as required. (Refer to 8 -
ELECTRICAL/FRONT

WIPERS/WASHERS

CLEANING) and (Refer to 8 - ELECTRICAL/FRONT
WIPERS/WASHERS - INSPECTION). Refer to the
appropriate wiring information. The wiring informa-
tion includes wiring diagrams, proper wire and con-
nector repair procedures, details of wire harness
routing and retention, connector pin-out information
and location views for the various wire harness con-
nectors, splices and grounds.

WARNING:

AVOID

PERSONAL

INJURY

DEATH, ON VEHICLES EQUIPPED WITH AIRBAGS,
DISABLE THE SUPPLEMENTAL RESTRAINT SYS-
TEM

BEFORE

ATTEMPTING

ANY

STEERING

(1) Turn the ignition switch to the On position.

Move the right multi-function switch control stalk to
the Low or High continuous wipe position. Check
whether the front wiper system operates. If OK, go to
Step 2. If not OK, repair the front wiper system as
required before you proceed with front washer sys-
tem diagnosis. Refer to WIPER SYSTEM.

(2) Turn the ignition switch to the Off position.

Disconnect and isolate the battery negative cable.
Disconnect the headlamp and dash wire harness con-
nector for the front washer pump/motor from the
washer pump/motor connector receptacle. Check for
continuity between the ground circuit cavity of the
headlamp and dash wire harness connector for the
front washer pump/motor and a good ground. There
should be continuity. If OK, go to Step 3. If not OK,
repair the open ground circuit to ground (G102) as
required.

(3) Reconnect the battery negative cable. Turn the

ignition switch to the On position. While pulling the
right multi-function switch control stalk toward the
steering wheel to close the washer switch, check for
battery voltage at the washer pump control switch
output circuit cavity of the headlamp and dash wire
harness connector for the front washer pump/motor.
If OK, replace the faulty front washer pump/motor. If
not OK, go to Step 4.

(4) Turn the ignition switch to the Off position.

Disconnect and isolate the battery negative cable.

8R - 6

FRONT WIPERS/WASHERS

FRONT WIPERS/WASHERS (Continued)

Disconnect the body wire harness connector for the
right multi-function switch from the switch connector
receptacle. Check for continuity between the washer
pump control switch output circuit cavity of the
headlamp and dash wire harness connector for the
front washer pump/motor and a good ground. There
should be no continuity. If OK, go to Step 5 If not
OK, repair the shorted washer pump control switch
output circuit between the front washer pump/motor
and the right multi-function switch as required.

(5) Check for continuity between the washer pump

control switch output circuit cavities of the headlamp
and dash wire harness connector for the front washer
pump/motor and the body wire harness connector for
the right multi-function switch. There should be con-
tinuity. If OK, replace the faulty right multi-function
switch. If not OK, repair the open washer pump con-
trol switch output circuit between the front washer
pump/motor and the right multi-function switch as
required.

CLEANING - FRONT WIPER & WASHER
SYSTEM

WIPER SYSTEM

The squeegees of wiper blades exposed to the ele-

ments for a long time tend to lose their wiping effec-
tiveness.

Periodic

cleaning

the

squeegees

suggested to remove any deposits of salt or road film.
The wiper blades, arms, and windshield glass should
only be cleaned using a sponge or soft cloth and
windshield washer fluid, a mild detergent, or a non-
abrasive cleaner. If the wiper blades continue to
leave streaks, smears, hazing, or beading on the
glass after thorough cleaning of the squeegees and
the glass, the entire wiper blade assembly must be
replaced.

CAUTION: Protect the rubber squeegees of the
wiper blades from any petroleum-based cleaners,
solvents, or contaminants. These products can rap-
idly deteriorate the rubber squeegees.

WASHER SYSTEM

If the washer system is contaminated with foreign

material, drain the washer reservoir by removing the
front washer pump/motor from the reservoir. Clean
foreign material from the inside of the washer pump/
motor inlet filter screen and the washer reservoir
using clean washer fluid, a mild detergent, or a non-
abrasive cleaner. Flush foreign material from the
washer system plumbing by first disconnecting the
washer hoses from the front washer nozzle, then run-
ning the front washer pump/motor to run clean
washer fluid or water through the system. Plugged or

restricted washer nozzles should be carefully back-
flushed using compressed air. If the washer nozzle
obstruction cannot be cleared, replace the washer
nozzle.

CAUTION: Never introduce petroleum-based clean-
ers, solvents, or contaminants into the washer sys-
tem. These products can rapidly deteriorate the
rubber seals and hoses of the washer system, as
well as the rubber squeegees of the wiper blades.

CAUTION: Never use compressed air to flush the
washer system plumbing. Compressed air pres-
sures are too great for the washer system plumbing
components and will result in further system dam-
age. Never use sharp instruments to clear a
plugged washer nozzle or damage to the nozzle ori-
fice and improper nozzle spray patterns will result.

INSPECTION - FRONT WIPER & WASHER
SYSTEM

WIPER SYSTEM

The front wiper blades and wiper arms should be

inspected periodically, not just when wiper perfor-
mance problems are experienced. This inspection
should include the following points:

(1) Inspect the wiper arms for any indications of

damage, or contamination. If the wiper arms are con-
taminated with any foreign material, clean them as
required. (Refer to 8 - ELECTRICAL/FRONT WIP-
ERS/WASHERS - CLEANING). If a wiper arm is
damaged or corrosion is evident, replace the wiper
arm with a new unit. Do not attempt to repair a
wiper arm that is damaged or corroded.

(2) Carefully lift the wiper blade off of the glass.

Note the action of the wiper arm hinge. The wiper
arm should pivot freely at the hinge, but with no lat-
eral looseness evident. If there is any binding evident
in the wiper arm hinge, or there is evident lateral
play in the wiper arm hinge, replace the wiper arm.

CAUTION: Do not allow the wiper arm to spring
back against the glass without the wiper blade in
place or the glass may be damaged.

(3) Once proper hinge action of the wiper arm is

confirmed, check the hinge for proper spring tension.
Remove the wiper blade from the wiper arm. Either
place a small postal scale between the blade end of
the wiper arm and the glass, or carefully lift the
blade end of the arm away from the glass using a
small fish scale. Compare the scale readings between
the right and left wiper arms. Replace a wiper arm if

FRONT WIPERS/WASHERS

8R - 7

FRONT WIPERS/WASHERS (Continued)

it has comparatively lower spring tension, as evi-
denced by a lower scale reading.

(4) Inspect the wiper blades and squeegees for any

indications of damage, contamination, or rubber dete-
rioration (Fig. 2). If the wiper blades or squeegees
are contaminated with any foreign material, clean
them and the glass as required. (Refer to 8 - ELEC-
TRICAL/FRONT WIPERS/WASHERS - CLEANING).
After cleaning the wiper blade and the glass, if the
wiper blade still fails to clear the glass without
smearing, streaking, chattering, hazing, or beading,
replace the wiper blade. Also, if a wiper blade is
damaged or the squeegee rubber is damaged or dete-
riorated, replace the wiper blade with a new unit. Do
not attempt to repair a wiper blade that is damaged.

WASHER SYSTEM

The

washer

system

components

should

inspected periodically, not just when washer perfor-
mance problems are experienced. This inspection
should include the following points:

(1) Check for ice or other foreign material in the

washer reservoir. If contaminated, clean and flush
the washer system. (Refer to 8 - ELECTRICAL/
FRONT WIPERS/WASHERS - CLEANING).

(2) Inspect the washer plumbing for pinched, leak-

ing, deteriorated, or incorrectly routed hoses and
damaged or disconnected hose fittings. Replace dam-
aged or deteriorated hoses and hose fittings. Leaking
washer hoses can sometimes be repaired by cutting
the hose at the leak and splicing it back together
using an in-line connector fitting. Similarly, sections
of deteriorated hose can be cut out and replaced by
splicing in new sections of hose using in-line connec-
tor fittings. Whenever routing a washer hose or a
wire harness containing a washer hose, it must be
routed away from hot, sharp, or moving parts. Also,
sharp bends that might pinch the washer hose must
be avoided.

FRONT CHECK VALVE

DESCRIPTION

A single front washer system check valve is stan-

dard equipment on this model, and is installed in the
front washer system plumbing (Fig. 3). The front
check valve is located in the engine compartment in
the washer supply hose on the underside of the hood
panel about 5 centimeters (2 inches) from the barbed
nipple of the front washer nozzle. The check valve
consists of a molded plastic valve body with a raised
arrowhead molded into its center section that indi-
cates the direction of the flow through the valve. A
barbed hose nipple is formed on each side of the
raised center section of the valve body. Within the
check valve body, a small diaphragm is held against
the lip of an integral sump well by a small plastic
piston and a coiled spring. The front check valve can-
not be adjusted or repaired and, if faulty or damaged,
it must be replaced.

Fig. 2 Wiper Blade Inspection

1 - WORN OR UNEVEN EDGES
2 - ROAD FILM OR FOREIGN MATERIAL DEPOSITS
3 - HARD, BRITTLE, OR CRACKED
4 - DEFORMED OR FATIGUED
5 - SPLIT
6 - DAMAGED SUPPORT COMPONENTS

Fig. 3 Check Valve

1 - INLET NIPPLE
2 - CHECK VALVE
3 - OUTLET NIPPLE
4 - FLOW DIRECTION ARROW

8R - 8

FRONT WIPERS/WASHERS

FRONT WIPERS/WASHERS (Continued)

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