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Jeep Liberty KJ. Manual - part 310

of the tailgate wire harness connector for the rear wiper module. If OK, go to Step 12. If not OK, repair the open
rear wiper intermittent driver circuit between the rear wiper module and the multi-function switch as required.

12. Turn the control ring on the right (wiper) control stalk of the multi-function switch to the On position. Check for

battery voltage at the rear wiper on driver circuit cavity of the tailgate wire harness connector for the rear wiper
module. If OK, replace the inoperative rear wiper module. If not OK, repair the open rear wiper on driver circuit
between the rear wiper module and the multi-function switch as required.

WASHER SYSTEM

WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental
restraint system before attempting any steering wheel, steering column, airbag, occupant classification sys-
tem, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect
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 precautions could result in accidental airbag deployment.

NOTE: The diagnosis found here addresses an electrically inoperative rear washer system. If the washer
pump/motor operates, but no washer fluid is emitted from the rear washer nozzle, be certain to check the
fluid level in the reservoir. Also inspect the rear washer system components as required. (Refer to 8 - ELEC-
TRICAL/REAR WIPERS/WASHERS - INSPECTION).

1. Turn the ignition switch to the On position. Turn the control ring on the right (wiper) control stalk of the multi-

function switch to the On position. Check whether the rear wiper system is operating. If OK, go to Step 2. If not
OK, test and repair the rear wiper system before continuing with these tests. Refer to WIPER SYSTEM .

2. Pull the right (wiper) control stalk of the multi-function switch toward the steering wheel. Check whether the front

washer system is operating. If OK, test the multi-function switch. (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING
- EXTERIOR/MULTI-FUNCTION SWITCH - DIAGNOSIS AND TESTING). If the multi-function switch tests OK, go
to Step 3. If the multi-function switch does not test OK, replace the inoperative switch.

3. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Disconnect the

headlamp and dash wire harness connector for the washer pump/motor unit from the pump/motor unit connector
receptacle. Check for continuity between the washer pump driver circuit cavity of the headlamp and dash wire
harness connector for the washer pump/motor unit and a good ground. There should be no continuity. If OK, go
to Step 4. If not OK, repair the shorted washer pump driver circuit between the washer pump/motor unit and the
multi-function switch as required.

4. Check for continuity between the washer pump driver circuit cavities of the headlamp and dash wire harness

connector for the washer pump/motor unit and the instrument panel wire harness connector for the multi-function
switch (Connector C-2). There should be continuity. If OK, go to Step 5. If not OK, repair the open washer pump
driver circuit between the washer pump/motor unit and the multi-function switch as required.

5. Check for continuity between the washer pump sense circuit cavity of the headlamp and dash wire harness con-

nector for the washer pump/motor unit and a good ground. There should be no continuity. If OK, go to Step 6.
If not OK, repair the shorted washer pump sense circuit between the washer pump/motor unit and the multi-
function switch as required.

6. Check for continuity between the washer pump sense circuit cavities of the headlamp and dash wire harness

connector for the washer pump/motor unit and the instrument panel wire harness connector for the multi-function
switch (Connector C-2). There should be continuity. If OK, replace the inoperative washer pump/motor unit. If not
OK, repair the open washer pump sense circuit between the washer pump/motor unit and the multi-function
switch as required.

CLEANING

FRONT

WIPER SYSTEM

The squeegees of wiper blades exposed to the elements for a long time tend to lose their wiping effectiveness.
Periodic cleaning of the squeegees is 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

8R - 32

WIPERS/WASHERS - SERVICE INFORMATION

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 rapidly deteriorate the rubber squeegees.

WASHER SYSTEM

If the washer system is contaminated with foreign material, drain the washer reservoir using a siphon. Remove the
washer pump/motor from the reservoir. Clean foreign material from the inside of the washer pump/motor inlet grom-
met seal/filter screen and flush 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
washer nozzles, then running the 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 cleaners, solvents, or contaminants into the washer system.
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 pressures are
too great for the washer system plumbing components and will result in further system damage. Never use
sharp instruments to clear a plugged washer nozzle or damage to the nozzle orifice and improper nozzle
spray patterns will result.

REAR

WIPER SYSTEM

The squeegee of a wiper blade exposed to the elements for a long time tends to lose its wiping effectiveness.
Periodic cleaning of the squeegee is suggested to remove any deposits of salt or road film. The wiper blade, arm,
and rear flip-up glass should only be cleaned using a sponge or soft cloth and windshield washer fluid, a mild deter-
gent, or a non-abrasive cleaner. If the wiper blade continues 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 squeegee of the wiper blade from any petroleum-based cleaners, solvents, or
contaminants. These products can rapidly deteriorate the rubber squeegee.

WASHER SYSTEM

If the washer system is contaminated with foreign material, drain the washer reservoir using a siphon. Remove the
washer pump/motor from the reservoir. Clean foreign material from the inside of the washer pump/motor inlet grom-
met seal/filter screen and flush 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 hose from the
washer nozzle, then running the washer pump/motor to run clean washer fluid or water through the system. A
plugged or restricted washer nozzle should be carefully back-flushed using compressed air. If the washer nozzle
obstruction cannot be cleared, replace the washer nozzle.

WIPERS/WASHERS - SERVICE INFORMATION

8R - 33

INSPECTION

FRONT

WIPER SYSTEM

The wiper blades and wiper arms should be inspected
periodically, not just when wiper performance prob-
lems are experienced. This inspection should include
the following points:

1. Carefully inspect the wiper blades for any indica-

tions of worn or uneven edges (1), foreign material
deposits (2), hardening or cracking (3), deformation
or fatigue (4), or splitting (5). Inspect the wiper
blade support components and the wiper arms for
damage (6) or corrosion. If the wiper arms and
blades are contaminated with any foreign material,
clean them and the glass as required. (Refer to 8 -
ELECTRICAL/FRONT

WIPERS/WASHERS

CLEANING). If a wiper blade or arm is damaged,
or if corrosion is evident, replace the affected wiper
arm or blade with a new unit. Do not attempt to
repair a wiper arm or blade that is damaged or cor-
roded.

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 lateral
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 it has comparatively lower spring
tension, as evidenced by a lower scale reading.

4. After cleaning and inspecting the wiper components and the glass, if the wiper blade still fails to clear the glass

without smearing, streaking, chattering, hazing, or beading, replace the wiper blade.

WASHER SYSTEM

The washer system components should be inspected periodically, not just when washer performance 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 sys-

tem. (Refer to 8 - ELECTRICAL/FRONT WIPERS/WASHERS - CLEANING).

2. Inspect the washer plumbing for pinched, leaking, deteriorated, or incorrectly routed hoses and damaged or dis-

connected hose fittings. Replace damaged 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 connector 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.

8R - 34

WIPERS/WASHERS - SERVICE INFORMATION

REAR

WIPER SYSTEM

The rear wiper blade and wiper arm should be
inspected periodically, not just when wiper perfor-
mance problems are experienced. This inspection
should include the following points:

1. Carefully inspect the wiper blade for any indications

of worn or uneven edges (1), foreign material
deposits (2), hardening or cracking (3), deformation
or fatigue (4), or splitting (5). Inspect the wiper
blade support components and the wiper arm for
damage (6). If the wiper arms and blades are con-
taminated with any foreign material, clean them
and the glass as required. (Refer to 8 - ELECTRI-
CAL/REAR WIPERS/WASHERS - CLEANING). If a
wiper blade or arm is damaged, replace the
affected wiper blade or arm with a new unit. Do not
attempt to repair a wiper arm or blade that is dam-
aged or corroded.

2. Carefully lift the wiper blade off of the glass. Note

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. The spring

tension of the wiper arm should be sufficient to cause the rubber squeegee to conform to the curvature of the
glass. Replace a wiper arm if it has low or no spring tension.

4. After cleaning and inspecting the wiper components and the glass, if the wiper blade still fails to clear the glass

without smearing, streaking, chattering, hazing, or beading, replace the wiper blade.

WASHER SYSTEM

The washer system components should be inspected periodically, not just when washer performance 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 sys-

tem. (Refer to 8 - ELECTRICAL/REAR WIPERS/WASHERS - CLEANING).

2. Inspect the washer plumbing for pinched, leaking, deteriorated, or incorrectly routed hoses and damaged or dis-

WIPERS/WASHERS - SERVICE INFORMATION

8R - 35

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