TM 5-3805-280-24-1
Sub-System Diagnostics
NOTE: A diode can fail in two modes, either shorted or open. Continuity will be
WINDSHIELD WIPER
YES: If continuity is
measured in one direction only in a serviceable diode.
MOTOR SUPPRESSION
measured in both checks,
DIODE (V6, V7) CHECK
diode has failed in a
shorted mode. Replace.
NO: If continuity is NOT
measured in either check,
diode has failed in an
open mode. Replace.
NO: If continuity is
measured in one check
T118385 UN21NOV98
and not the other, diode
is OK. Check wiring
The windshield wiper diodes are located inside right console lower cover.
harness and monitor
controller
Remove diodes from connectors.
Connect an ohmmeter to diode terminals.
9015
Is continuity measured?
15
29
Reverse ohmmeter probes.
Is continuity measured?
Install diodes in connectors.
1/1
YES: Relay is OK.
WINDSHIELD WIPER
1--24-Volt Terminal
RELAY (MOTOR
2--Ground Terminal
GROUND AND
3--Relay Common
NO: Relay has failed.
INTERMITTENT) (K6),
4--Relay Normal Closed
Replace.
WINDSHIELD WIPER
5--Relay Normal Open
RELAY (WIPER RUN)
(K7), WINDSHIELD
Disconnect relay from harness.
WIPER RELAY (HOLD
FOR PARK) (K8) AND
T7447BG
1914JAN91
WINDSHIELD WIPER
RELAY (MOTOR
Does ohmmeter read continuity?
GROUND FOR PARK)
(K9) CHECK
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.
Does ohmmeter read continuity?
1/1
4-94
