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Symptom: Turn signal lamp is off.
Some of the turn signal lamps on one
side is not on.
Take down the turn signal lamp
cover and check if the bulb is burnt.
Yes
Measure
Replace
between power line contact
turn signal
of lamp holder and the
lamp bulb.
ground with a voltmeter.
No voltage display
Grounding wire of lamp
holder
is
of
poor
contact or bulb of turn
signal lamp is badly
contacted with lamp
holder.
Turn signal lamp is still off after short circuit.
Diagnosis procedures
Turn signal lamp is not on.
Take down the turn signal lamp
cover and check if the bulb is burnt.
No
the
voltage
Replace
turn signal
lamp bulb.
No voltage display
Power line to
the
lamp
holder
is
broken.
Slide turn signal lamp switch and short circuit it with a piece of
wire or a screwdriver two lugs of scintillator.
All the turn signal lamps on
one side are not on.
Yes
No
Separate
connectors
of turn signal lamp,
measure and check
with an ohmmeter if
turn signal lamp switch
works on faulty side.
Yes
No
Power line on
Inner contact
the troubled side
of turn signal
is
broken
or
lamp is poorly
grounding
wire
contacted.
of lamp holder is
poorly
contacted.
All the turn signal lamps are not
on.
Press horn button and
check
Electric horn
sounds loudly
Power
supply
from
battery is normal.
Take down the turn signal
lamp cover and check if
the bulb is burnt.
No
Replace turn signal lamp
bulb and check if regulator
works normally.
Turn signal lamp is still on after short circuit.
Electric
horn
does not sound
or
sounds
hoarse.
Battery
is
low.
Yes
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