E-9 Headlamp, Clearance Lamp And Tail Lamp Do Not Light Up Or Go Off - Komatsu WA250-6 Shop Manual

SEN03848-00

E-9 Headlamp, clearance lamp and tail lamp do not light up or go off

Contents of
(1) Headlamp, clearance lamp and tail lamp do not light up or go off.
trouble
• Since the lamp system GND circuit is disconnected or shorted with the ground, none of the lamps
lights up.
• Headlamp at SMALL position: Clearance lamp, tail lamp, machine monitor night lamp light up (when
normal).
• Headlamp at HEAD position: Above lamps and headlamp light up (when normal).
Related
• The input state (voltage) from the lamp switch (small lamp) to the machine monitor can be checked
information
with the monitoring function (Code: MONITOR PANEL 40200, SMALL LAMP).
• The input state (ON/OFF) to the machine monitor from the lamp switch (head lamp) can be checked
with the monitoring function (Code: MONITOR PANEL 40900, D-IN-0).
• The input state (ON/OFF) to the machine monitor from the dimmer switch (high beam) can be
checked with the monitoring function (Code: MONITOR PANEL 40904, D-IN-34).
Defective lamp switch
1
Possible
(Internal trouble)
causes and
standard value
in normal state
Disconnection in wiring har-
ness
2
(Disconnection or defective
connector contact)
38
40-400
E-9 Headlamp, clearance lamp and tail lamp do not light up or go off
Causes
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between (2) and (3)
Between (1) and (3)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between L04 (female) (3) –
ground
400 Troubleshooting of electrical system (E-mode)
Standard value in normal state/Remarks on troubleshooting
L04 (male) Lamp switch Resistance
OFF Min. 1 Mz
1st line Min. 1 Mz
2nd line Max. 1 z
OFF Min. 1 Mz
Max. 1 z
1st line
Max. 1 z
2nd line
Resis-
tance
WA250, 250PZ-6
1
Max. 1 z