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WINDSHIELD WIPER AND WASHER SYSTEMS
8K - 1
WINDSHIELD WIPER AND WASHER SYSTEMS
C O N T E N T S
Page
WINDSHIELD WASHERS
WINDSHIELD WIPER SYSTEM SERVICE
PROCEDURES
Page
.. 15
INTERMITTENT WINDSHIELD WIPER FUNCTION
AND SWITCH TESTING PROCEDURES
5
TWO SPEED WINDSHIELD WIPER MOTOR AND
SWITCH TESTING PROCEDURES
1
GENERAL INFORMATION
The w i n d s h i e l d wipers can be operated w i t h t h e
w i n d s h i e l d w i p e r s w i t c h only w h e n t h e i g n i t i o n
s w i t c h i s i n t h e ACCESSORY or I G N I T I O N position.
A fuse located i n t h e fuse block protects t h e c i r c u i t r y
of t h e w i p e r system and the vehicle.
The same m o t o r i s used for standard a n d i n t e r m i t -
t e n t wipe systems.
The w i p e r motor has permanent magnet fields. The
speeds are determined by c u r r e n t flow t o t h e appro-
p r i a t e set o f brushes.
TWO S P E E D WINDSHIELD WIPER MOTOR AND SWITCH T E S T I N G P R O C E D U R E S
The i n t e r m i t t e n t wipe system i n a d d i t i o n t o low
and h i g h speed, has a delay mode. The delay mode
has a range o f 2 to 15 seconds. T h i s is accomplished
by a variable resistor i n the w i p e r switch a n d i s con-
t r o l l e d electrically by a relay.
The wiper system completes t h e wipe cycle w h e n
the switch is t u r n e d OFF. T h e blades p a r k i n t h e
lowest p o r t i o n o f the wipe p a t t e r n .
I f t h e washer knob is depressed w h i l e t h e system is
i n t h e O F F position, t h e w i p e r control module w i l l
t u r n t h e wiper motor on a n d allow i t t o operate
t h r o u g h 3-4 wipe cycles and t h e n t u r n OFF.
INDEX
Standard Two Speed Wiper Motor System Test
Page
. . . 1
Switch Test
Page
. . . 4
STANDARD TWO SPEED WIPER MOTOR SYSTEM
TEST
The f o l l o w i n g is a l i s t of general wiper m o t o r sys-
t e m problems, the tests t h a t are to be performed to
locate the f a u l t y p a r t , and the corrective action t o be
t a k e n . The same motor is used for standard a n d op-
t i o n a l systems. I f t h e malfunction involves o n l y the
Delay mode, s w i t c h , or w i r i n g , refer t o the I n t e r m i t -
t e n t W i n d s h i e l d W i p e r Motor a n d S w i t c h Service
Procedures.
CONDITION
Motor w i l l not r u n i n a n y s w i t c h position.
PROCEDURE
(1) Check for a b l o w n fuse i n the fuse block.
(a) I f fuse is good, proceed t o step No. 2.
(b) I f fuse is defective, replace and check motor
operation i n a l l s w i t c h positions.
(c) I f m o t o r is s t i l l inoperative a n d t h e fuse
does not blow, proceed to step No. 2.
(d) I f replacement fuse blows, proceed t o step
No. 5.
(2) Place s w i t c h i n low speed position.
(3) L i s t e n to motor. I f you cannot hear i t r u n n i n g ,
proceed to step No. 4. I f you hear i t r u n n i n g , check
motor output shaft. I f output shaft i s not t u r n i n g , re-
place motor assembly. I f i t is t u r n i n g , c r a n k a r m or
drive l i n k is n o t properly connected. Replace w o r n
parts and/or properly connect d r i v e l i n k to t h e motor
o u t p u t shaft.
(4) Connect a voltmeter between motor t e r m i n a l
" L " and ground strap (Fig. 1). I f there is no voltage
or very l i t t l e voltage (less t h a n one volt) present,
move negative test lead from t h e ground strap to bat-
t e r y negative t e r m i n a l .
(a) I f a n increase i n voltage is noticed, t h e
problem is a bad ground c i r c u i t . M a k e sure t h e mo-
tor m o u n t i n g is free of p a i n t a n d t h a t n u t s or bolts
are t i g h t .
(b) I f there is s t i l l no i n d i c a t i o n of voltage, the
problem is a n open circuit i n t h e w i r i n g harness or
wiper switch.
(c) I f no noticeable increase (greater t h a n 3
volts) i n voltage is observed, t h e problem i s a
f a u l t y motor assembly.
(5) Disconnect motor w i r i n g connector a n d replace
fuse.
(a) I f fuse does not blow, motor is defective.
(b) I f fuse blows, switch o r w i r i n g is a t fault.
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