E-11 Turn Signal Lamp And Hazard Lamp Do Not Light Up Or Go Off - Komatsu WA250-6 Shop Manual

400 Troubleshooting of electrical system (E-mode)

E-11 Turn signal lamp and hazard lamp do not light up or go off

E-11 Turn signal lamp and hazard lamp do not light up or go off
Contents of
(1) Either of turn signal lamp and hazard lamp does not light up or go off.
trouble
• The switch, lamp, or wiring harness of the turn signal lamp and hazard lamp system is defective.
• The input state (ON/OFF) to the machine monitor from the turn signal lamp & hazard lamp switch
(right turn signal lamp) can be checked with the monitoring function (Code: MONITOR PANEL 40901,
Related
D-IN-12).
information
• The input state (ON/OFF) to the machine monitor from the turn signal lamp & hazard lamp switch (left
turn signal lamp) can be checked with the monitoring function (Code: MONITOR PANEL 40901, D-
IN-13).
Defective No.2 and No.10
1
fuses of fuse box (FS1)
Defective hazard relay (L125)
2
(Internal trouble)
Possible
causes and
Defective hazard/turn signal
standard value 3
relay (L124)
in normal state
Defective flasher unit
4
(Internal trouble)
WA250, 250PZ-6
Causes
If the fuse is burn, the circuit probably has a grounding fault, etc.
(See cause 8.)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
When hazard relay (L125) is replaced with a relay of the same type,
if the condition becomes normal, the hazard relay is defective.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
When hazard/turn signal relay (L124) is replaced with a relay of the
same type, if the condition becomes normal, the hazard/turn signal
relay is defective.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between (3), (4) and ground
Standard value in normal state/Remarks on troubleshooting
L125 (male)
Between (1) and (2)
L124 (male)
Between (5) and (6)
(1), (2), (3), (4) – (6)
L19
Between (3) and (1)
Between (4) and (1)
L19 (male)
SEN03848-00
Resistance
200 – 400 z
Resistance
200 – 400 z
Min. 1 Mz
Voltage
20 – 30 V
20 – 30 V and 0 V are indicated
repeatedly.
Resistance
Min. 1 Mz
40-400
1
51