Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 253

CONDITION

POSSIBLE CAUSES

CORRECTION

WIPERS INOPERATIVE IN

HIGH POSITION

1. Faulty high speed circuit.

1. Test and repair the open high speed
circuit between the multi-function switch
and the wiper motor as required.

2. Faulty multi-function switch.

2. Test and replace the multi-function
switch as required.

3. Faulty wiper high speed brush.

3. Test and replace the wiper motor as
required.

WIPERS DO NOT PARK

AFTER OPERATING

1. Faulty motor feed circuit.

1. Test and repair the open fused ignition
switch output circuit to the wiper motor as
required.

2. Faulty park switch output circuit.

2. Test and repair the open or shorted cir-
cuit between the wiper park switch and
the wiper relay as required.

3. Faulty wiper relay.

3. Test and replace the wiper relay as re-
quired.

4. Faulty park switch.

4. Test and replace the wiper motor as
required.

WASHERS INOPERATIVE

1. Faulty washer pump ground cir-
cuit.

1. Test and repair the open ground circuit
as required.

2. Faulty washer pump feed circuit.

2. Test and repair the open circuit be-
tween the multi-function switch and the
washer pump as required.

3. Faulty washer pump motor.

3. Test and replace the washer pump as
required.

4. Faulty muli-function switch.

4. Test and replace the multi-function
switch as required.

AUTOMATIC WIPER SYSTEM

CONDITION

POSSIBLE CAUSES

CORRECTION

WIPERS INOPERATIVE IN

ALL SWITCH POSITIONS

1. Faulty or missing fuse.

1. Test and replace the fuse as required.

2. Faulty wiper motor ground circuit.

2. Test and repair the open ground circuit
as required.

3. Faulty wiper motor.

3. Test and replace the wiper motor as
required.

4. Faulty multi-function switch feed
circuit.

4. Test and repair the open fused ignition
switch output circuit between the fuse and
the multi-function switch as required.

5. Faulty multi-function switch.

5. Test and replace the multi-function
switch as required.

6. Faulty rain sensor control module
ground circuit.

6. Test and repair the open ground circuit
as required.

7. Faulty rain sensor control module
feed circuit.

7. Test and repair the open fused ignition
switch output circuit between the fuse and
the rain sensor control module as re-
quired.

8. Faulty rain sensor control mod-
ule.

8. Test and replace the rain sensor control
module as required.

VA

WIPERS/WASHERS

8R - 7

CONDITION

POSSIBLE CAUSES

CORRECTION

AUTOMATIC WIPE INOP-

ERATIVE (WITH AC-

KNOWLEDGE-MENT

WIPE)

1. Faulty rain sensor shielding
ground circuits.

1. Test and repair the open shielding cir-
cuits as required.

2. Faulty rain sensor ground circuit.

2. Test and repair the open ground circuit
between the rain sensor and the control
module as required.

3. Faulty faulty rain sensor feed cir-
cuit.

3. Test and repair the open feed circuit
between the rain sensor and the control
module as required.

4. Faulty rain sensor signal circuit.

4. Test and repair the open or shorted sig-
nal circuit between the rain sensor and the
control module as required.

5. Faulty rain sensor.

5. Test and replace the rain sensor as re-
quired.

AUTOMATIC WIPE INOP-

ERATIVE (NO ACKNOWL-

EDGE-MENT WIPE)

1. Faulty rain sensor control mod-
ule.

1. Test and replace the rain sensor control
module as required.

WIPERS INOPERATIVE IN

LOW POSITION AND NO

PULSE FEATURE

1. Faulty low speed request circuit.

1. Test and repair the open low speed re-
quest circuit between the multi-function
switch and the rain sensor control module
as required.

2. Faulty multi-function switch.

2. Test and replace the multi-function
switch as required.

3. Faulty low speed control circuit.

3. Test and repair the open low speed
control circuit between the rain sensor
control module and the wiper motor as
required.

4. Faulty wiper low speed brush.

4. Test and replace the wiper motor as
required.

WIPERS INOPERATIVE IN

HIGH POSITION

1. Faulty high speed request circuit.

1. Test and repair the open high speed
request circuit between the multi-function
switch and the rain sensor control module
as required.

2. Faulty multi-function switch.

2. Test and replace the multi-function
switch as required.

3. Faulty high speed control circuit.

3. Test and repair the open high speed
control circuit between the rain sensor
control module and the wiper motor as
required.

3. Faulty wiper high speed brush.

3. Test and replace the wiper motor as
required.

8R - 8

WIPERS/WASHERS

VA

CONDITION

POSSIBLE CAUSES

CORRECTION

WIPERS DO NOT PARK

AFTER OPERATING

1. Faulty park switch output circuit.

1. Test and repair the open or shorted cir-
cuit between the wiper park switch and
the rain sensor control module as re-
quired.

2. Faulty wiper relay output circuit.

2. Test and repair the open or shorted cir-
cuit between the rain sensor control mod-
ule and the wiper relay as required.

3. Faulty wiper relay.

3. Test and replace the wiper relay as re-
quired.

4. Faulty park switch.

4. Test and replace the wiper motor as
required.

5. Faulty intermittent wipe logic cir-
cuit.

5. Replace the steering column fuse block
as required.

WASHERS INOPERATIVE

1. Faulty washer pump ground cir-
cuit.

1. Test and repair the open ground circuit
as required.

2. Faulty washer pump request cir-
cuit.

2. Test and repair the open washer pump
request circuit between the multi-function
switch and the rain sensor control module
as required.

3. Faulty muli-function switch.

3. Test and replace the multi-function
switch as required.

4. Faulty washer pump control cir-
cuit.

4. Test and repair the open washer pump
control circuit between the rain sensor
control module and the washer pump as
required.

5. Faulty washer pump motor.

5. Test and replace the washer pump as
required.

CLEANING - 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

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 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
washer pump/motor from the reservoir. Clean foreign
material from the inside of the washer pump/motor
inlet nipple and the washer reservoir using clean
washer fluid, a mild detergent, or a non-abrasive
cleaner. Flush foreign material from the washer sys-
tem 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 obstruc-
tion 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.

VA

WIPERS/WASHERS

8R - 9

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 - WIPER & WASHER SYSTEM

WIPER SYSTEM

The 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/WIPERS/

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
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. 3). If the wiper blades or squeegees
are contaminated with any foreign material, clean
them and the glass as required. (Refer to 8 - ELEC-
TRICAL/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 deteriorated, 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

be

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/WIP-
ERS/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.

Fig. 3 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

8R - 10

WIPERS/WASHERS

VA