Windshield Wiper And Windshield Washer Do Not Operate - Komatsu PC130-7 Shop Manual

TROUBLESHOOTING
E-20 Windshield wiper and windshield washer do not operate
Trouble (1) Windshield wiper does not operate.
Related • The input state (ON/OFF) from the window rear limit switch can be checked with the monitoring function.
information (Code: 049, Center of upper line)
Defective window rear limit
switch
1
(Internal disconnection or
short circuit)
Defective wiper motor
2
(Internal disconnection)
Disconnection in wiring
harness
3 (Disconnection in wiring
harness or defective
Possible causes
contact in connector)
and standard
value in normal
Short circuit with chassis
state
ground in wiring harness
4
(Contact with ground
circuit)
Defective monitor panel
(Window rear limit switch
system)
5
Defective monitor panel
(Wiper motor system)
20-436
(1)
Cause Standard value in normal state/Remarks on troubleshooting
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
W03 (male)
Between (1) and (2)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Wiring harness between P01 (female) (9) and
W04 (male) (3)
Wiring harness between P01 (female) (10) and
W04 (male) (1)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between P02 (female) (15) – W03 (female) (1)
wiring harness and chassis ground
aPrepare with starting switch OFF, then turn starting switch ON and car-
ry out troubleshooting.
Between (15) and
chassis ground
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between (9) and
chassis ground
Between (10) and
chassis ground
Front window
When installed to front
When stored in rear
W04 (female)
Between (3) and (1)
P02 Front window
When installed to front
When stored in rear
P01 Wiper switch
OFF
ON
E-20
Resistance
Min. 1 Mz
Max. 1 z
Continuity
There is continuity
Max. 1 z
Resistance
Max. 1 z
Resistance
Min. 1 Mz
Resistance
Voltage
20 – 30 V
Max. 1 V
Voltage
Max. 1 V
Max. 1 V 20 – 30 V
(Constant period)
PC130-7