TM 5-3805-280-24-1
Sub-System Diagnostics
grounded by the motor internal switch, and the motor
When windshield wiper motor M3 reaches the
stops.
intermittent stop position, wiper motor terminal S is
switched from ground to +24 volts by the wiper motor
WINDSHIELD WASHER OPERATION
internal switch. The +24 volts is applied to wiper motor
terminal E, and also reverse biases windshield wiper
When windshield washer switch S15 is pressed,
relay isolation diode V5, causing windshield wiper
windshield washer relay K2 is energized by a ground
relays K7 (wiper run) and K8 (hold for park) to be
at terminal 24 of monitor controller and display A5.
de-energized. Ground is now applied through contacts
Power is applied to windshield washer motor M4 from
5 and 3 of energized relay K9 and contacts 3 and 4 of
windshield wiper 10amp fuse F12 through contacts 3
de-energized relay K7 to wiper motor terminal L. With
and 5 of energized relay K2. The motor drives the
+24 volts on wiper motor terminal E and ground on
windshield washer pump, to spray fluid from the
wiper motor terminal L, the motor runs backwards until
windshield washer fluid reservoir onto the windshield.
a cam in the Pittman arm assembly causes the wiper
When the switch is released, ground is removed from
to be driven off the right side of the windshield into the
terminal 24 of monitor controller and display A5, and
park position on the windshield frame . When the wiper
the washer motor stops.
motor reaches the park position, motor terminal S is
9015
15
25
CED,OUOE012,7
1921OCT982/2
4-90
