Rear Wiper Motor Description; Operation; Removal - Chrysler Vehicle User Manual

8R - 38 REAR WIPERS/WASHERS
REAR WIPER MOTOR
DESCRIPTION
Fig. 18 Rear Wiper Motor
1 - OUTPUT SHAFT
2 - TRANSMISSION
3 - PIGTAIL CONNECTOR (ON BACK)
4 - INSULATOR
5 - BRACKET
6 - MOTOR
7 - PIGTAIL WIRES
The rear wiper motor is concealed behind a molded
plastic trim cover on the inside of the liftglass near
the right liftglass hinge at the top of the glass. A
large blackout area of the liftglass conceals the unit
from the exterior of the vehicle. The end of the motor
output shaft that protrudes through a large rubber
grommet in the liftglass to drive the rear wiper arm
and blade is the only visible component of the rear
wiper motor (Fig. 18). A large flat washer and a nut
secure and seal the motor output shaft to the outside
of the liftglass, while a rubber insulator in a slot on
the outboard upper corner of the motor bracket is
secured by a stud and nut to the inside of the lift-
glass near the right liftglass hinge. The connector of
a short pigtail harness is secured to a tab on the
back of the motor bracket, and connects the rear
wiper motor to the vehicle electrical system through
a dedicated take out and connector of the hardtop
wire harness. The rear wiper motor consists of the
following major components:
• Bracket - The rear wiper motor bracket consists
of a stamped steel mounting plate that is secured
with screws to the wiper motor and transmission. A
rubber insulator in a slot on the upper outboard cor-
ner of the bracket is secured by a nut and washer to
a stud on the inside surface of the liftglass. An inte-
gral tab on the back of the bracket supports the
wiper motor pigtail wire connector.
• Motor - The single-speed permanent magnet
rear wiper motor is secured with screws to the rear
wiper motor bracket. The wiper motor includes an
integral transmission, a motor output shaft, a diode,
and the rear wiper motor park switch.
The rear wiper motor cannot be adjusted or
repaired. If any component of the motor is faulty or
damaged, the entire rear wiper motor unit must be
replaced. The motor output shaft grommet, washer
and nut are available for individual service replace-
ment.

OPERATION

The rear wiper motor operation is controlled by the
vehicle operator through battery current inputs
received by the rear wiper motor from the rear wiper
and washer switch on the instrument panel, and the
rear wiper motor park switch, which control current
flow to the wiper motor brushes. An internal diode
protects the motor from feedback through the park
switch when the switch is closed to the fused ignition
switch output (run) circuit. An internal circuit
breaker protects the motor from overloads.
The park switch is a single pole, single throw,
momentary switch within the wiper motor that is
mechanically actuated by the wiper motor transmis-
sion components. The park switch alternately closes
the wiper motor brush to the rear wiper and washer
switch output or to a fused ignition switch output
(run) circuit, depending upon the position of the
wiper on the glass. This feature allows the motor to
complete its current wipe cycle after the wiper sys-
tem has been turned Off, and to park the wiper blade
in the uppermost portion of the wipe pattern.
The wiper motor transmission converts the rotary
output of the wiper motor to the back and forth wip-
ing motion of the rear wiper arm and blade on the
liftglass. The rear wiper motor may be diagnosed
using conventional diagnostic tools and methods.

REMOVAL

(1) Disconnect and isolate the battery negative
cable.
(2) Remove the rear wiper arm from the rear
wiper motor output shaft. (Refer to 8 - ELECTRI-
CAL/REAR WIPERS/WASHERS/REAR WIPER ARM
- REMOVAL).
(3) Remove the nut that secures the threaded
sleeve of the rear wiper motor output shaft to the
outside of the liftglass (Fig. 19).
(4) Remove the washer from the rear wiper motor
output shaft sleeve.
(5) Remove the trim cover from the rear wiper
motor on the inside of the liftglass. (Refer to 8 -
ELECTRICAL/REAR
WIPER MOTOR TRIM COVER - REMOVAL).
(6) Disconnect the hardtop wire harness connector
for the rear wiper motor from the motor pigtail wire
connector.
WIPERS/WASHERS/REAR
TJ