2006 MERCEDES-BENZ SPRINTER wiper blades

towards the pivot end of the arm far enough to dis-
engage the pivot block from the hook formation on
the end of the arm (Fig. 27).
(4) Extract the hook formation on the tip of the
wiper arm from the opening in the wiper blade
superstructure ahead of the wiper blade pivot block/
latch unit.
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.
(5) Gently lower the wiper arm tip onto the glass.
INSTALLATION
NOTE: The wiper arms and wiper blades for this
model are both unequal in length, with the longer
arm and blade being installed on the left (driver)
side of the windshield.
(1) Lift the wiper arm off of the windshield glass,
until the wiper arm hinge is in its over-center posi-
tion.
(2) Position the wiper blade near the hook forma-
tion on the tip of the arm.
(3) Insert the hook formation on the tip of the
wiper arm through the opening in the wiper blade
superstructure ahead of the wiper blade pivot block/
latch unit far enough to engage the pivot block with
the hook (Fig. 27).
(4) Slide the wiper blade pivot block/latch up into
the hook formation on the tip of the wiper arm until
the latch release tab snaps into its locked position.
Latch engagement will be accompanied by an audible
click.
(5) Gently lower the wiper blade onto the glass.
Fig. 27 Wiper Blade Remove/Install
1 - HOOK
2 - WIPER BLADE
3 - WIPER ARM
4 - RELEASE TAB
VAWIPERS/WASHERS 8R - 27

WIPER LINKAGE
DESCRIPTION
The wiper linkage and pivots are concealed within
the engine compartment below the cowl top panel
(Fig. 28). The ends of the wiper pivot shafts that pro-
trude through dedicated openings in the cowl top
panel to drive the wiper arms and blades are the
only visible components of the wiper linkage module.
The wiper linkage module consists of the following
major components:
²Linkage- The two wiper drive links are each
constructed of stamped steel. The left (driver) side
drive link has a plastic socket-type bushing in one
end, and a plastic sleeve-type bushing in the other
end. The socket bushing is snap-fit over the ball stud
on the left pivot crank arm, while the sleeve bushing
is fit over the longer ball stud on the wiper motor
crank arm. The right (passenger) side drive link has
a plastic socket-type bushing on each end. One end of
this drive link is snap-fit over the exposed end of the
longer ball stud on the wiper motor crank arm and
captures the sleeve bushing end of the left drive link
beneath it, while the other end is snap-fit over the
ball stud on the right pivot crank arm.
²Module Bracket- The linkage module bracket
consists of a long tubular steel main member that is
crimped to a molded plastic pivot bracket at each end
where the wiper pivots are secured. A stamped steel
mounting plate for the wiper motor is secured with
welds near the center of the main member and is
then secured with screws to the underside of the cowl
top panel.
²Motor Crank Arm- The wiper motor crank
arm is a stamped steel unit with a round hole on the
driven end that is secured to the wiper motor outputshaft with a nut, and a long ball stud secured to the
drive end.
²Pivot- The two molded plastic wiper pivot
brackets are secured to the ends of the linkage mod-
ule bracket tubular member. The crank arms that
extend from the bottom of the pivot shafts each have
a ball stud on their end. The upper end of each pivot
shaft where the wiper arms will be fastened each is
tapered and externally serrated with a threaded stud
at the top where the wiper arms are secured by a
nut. Each pivot shaft operates within a housing
formed in the pivot bracket featuring a large external
flange near its center and external threads near the
top. The pivot housings are secured to the outer sur-
face of the cowl top panel by a large washer and a
nut threaded onto the outside of the housing where it
protrudes through the cowl top.
The wiper linkage module cannot be adjusted or
repaired. If any component of the linkage module is
faulty or damaged, the entire wiper linkage module
unit must be replaced.
OPERATION
The wiper linkage operation is controlled by the
output of the wiper motor through the wiper motor
crank arm. The wiper motor crank arm, the two
wiper drive links, and the two wiper pivots mechan-
ically convert the rotary output of the wiper motor to
the back and forth wiping motion of the wiper arms
and blades on the glass.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
Fig. 28 Wiper Linkage Module
1 - PIVOT SHAFT (2) 4 - PIVOT CRANK ARM (2)
2 - PIVOT SHAFT HOUSING (2) 5 - DRIVE LINK (2)
3 - MODULE BRACKET 6 - MOTOR CRANK ARM
8R - 28 WIPERS/WASHERSVA

OPERATION
The wiper motor operation is controlled by the
vehicle operator through battery current inputs
received by the wiper motor from the wiper switch
circuitry of the multi-function switch on the top of
the steering column, and from the wiper relay on the
fuse block underneath the steering column. The
wiper motor speed is controlled by current flow to
either the low speed or the high speed set of brushes.
The automatic resetting circuit breaker protects the
motor from overloads.
The park switch consists of a contact disc and
three contacts. The contact disc is mechanically fas-
tened to and rotated with a gear in the wiper motor
transmission. Two input contacts alternately close
the wiper park switch sense output circuit contact to
ground or to battery current, depending upon the
position of the wipers on the glass. This feature
allows the intermittent wipe logic circuit to monitor
the position and the cycles of the wiper motor to pro-
vide the intermittent wipe and wipe-after-wash
modes, as well as allowing the motor to complete its
current wipe cycle after the wiper system has been
turned Off and park the wiper blades in the lowest
portion of the wipe pattern.
The wiper motor may be diagnosed using conven-
tional diagnostic tools and methods.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Disconnect the vehicle wire harness connector
for the wiper motor from the motor pigtail wire con-
nector (Fig. 32).
8R - 32 WIPERS/WASHERSVA

(3) Remove the nut that secures the motor crank
arm to the wiper motor output shaft.
(4) If this wiper motor is to be reinstalled, make
an index mark between the wiper motor output shaft
and the motor crank arm using a suitable marker.
(5) Disengage the motor crank arm from the wiper
motor output shaft.
(6) Remove the three screws that secure the wiper
motor to the wiper linkage module motor bracket.
(7) Remove the wiper motor from the wiper link-
age module motor bracket.
INSTALLATION
(1) Position the wiper motor to the underside of
the wiper linkage module motor bracket (Fig. 32).
(2) Install and tighten the three screws that secure
the wiper motor to the wiper linkage module motor
bracket. Tighten the screws to 12 N´m (105 in. lbs.).
(3) If this wiper motor is being reinstalled, position
the motor crank arm on the wiper motor output shaft
so that the index marks made during the removal
procedure are aligned. If this is a new wiper motor
installation, the motor crank arm should be installedso that it is pointed toward the left (driver) side of
the vehicle and parallel with the two wiper drive
links while both wiper blades are positioned on their
alignment marks near the lower edge of the wind-
shield glass.
(4) Install and tighten the nut that secures the
motor crank arm to the wiper motor output shaft.
Tighten the nut to 12 N´m (105 in. lbs.).
(5) Reconnect the vehicle wire harness connector
for the wiper motor to the motor pigtail wire connec-
tor.
(6) Reconnect the battery negative cable.
Fig. 32 Wiper Motor Remove/Install
1 - NUT 4 - PIGTAIL WIRE CONNECTOR
2 - LINK (2) 5 - WIPER MOTOR
3 - MOTOR CRANK ARM 6 - SCREW (3)
VAWIPERS/WASHERS 8R - 33