TM 5-3805-281-24-1
Sub-System Diagnostics
YES: Relay is OK.
WINDSHIELD WASHER
1--24-Volt Terminal
RELAY (K2) CHECK
2--Ground Terminal
3--Relay Common
NO: Relay has failed.
4--Relay Normal Closed
Replace.
5--Relay Normal Open
Disconnect relay from harness.
T7447BG
1914JAN91
Does ohmmeter read continuity?
Connect 24 volts to relay terminal 1 and ground terminal
2.
Does relay "click"?
With 24 volts still connected to terminal 1 connect
ohmmeter to terminals 3 and 5.
9015
15
Does ohmmeter read continuity?
30
1/1
WINDSHIELD WASHER
Disconnect harness from windshield washer motor.
YES: Check wiring
MOTOR (M4) CHECK
harness and monitor
controller.
Connect 24 volts to BLUE wire terminal in washer motor
connector.
NO: Replace windshield
washer motor.
Ground BLUE/BLACK wire terminal in washer motor
connector.
Does windshield washer motor operate?
T7395EG
UN15OCT90
1/1
Slide upper windshield up.
YES: Windshield wiper
WINDSHIELD WIPER
enable switch is OK.
ENABLE SWITCH (S14)
CHECK
Remove windshield wiper enable switch retaining plate located in upper right hand
corner of cab.
NO: Check wiring
harness and monitor
controller.
Connect ohmmeter across pins 1 and 2 of the switch and actuate the switch.
Is continuity measured when switch is actuated and no continuity when switch is not
actuated?
1/1
4-98
