SEN03848-00
40-400 38 WA250, 250PZ-6
400 Troubleshooting of electrical system (E-mode)
E-9 Headlamp, clearance lamp and tail lamp do not light up or go off
E-9 Headlamp, clearance lamp and tail lamp do not light up or go off 1
Contents of
trouble
(1) Headlamp, clearance lamp and tail lamp do not light up or go off.
Related
information
• 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).
• The input state (voltage) from the lamp switch (small lamp) to the machine monitor can be checked
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).
Possible
causes and
standard value
in normal state
Causes Standard value in normal state/Remarks on troubleshooting
1
Defective lamp switch
(Internal trouble)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
L04 (male) Lamp switch Resistance
Between (2) and (3)
OFF Min. 1 Mz
1st line Min. 1 Mz
2nd line Max. 1 z
Between (1) and (3)
OFF Min. 1 Mz
1st line Max. 1 z
2nd line Max. 1 z
2
Disconnection in wiring har-
ness
(Disconnection or defective
connector contact)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between L04 (female) (3) –
ground
Resis-
tance
Max. 1 z
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