Symptom: Brake lamp does not work. Diagnosis procedures
Brake lamp does not work.
Take down cover of brake lamp and check if bulb is burnt.
Replace bulb Use a piece of wire to short circuit two terminals of
brake lamp switch or plugs of two hatching lines.
Lamp is not lit after short circuit. Brake lamp is lit after short circuit.
Use a screwdriver or a piece of wire to touch
quickly power line of brake lamp switch and
grounding wire and check sparks.
Brake lamp switch is not
properly adjusted or its
inner contact is not well
contacted.
Spark at touch No spark at touch
Wire from brake lamp
switch to brake lamp is
broken or shorted.
Power line from ignition
switch to brake lamp switch
is broken or shorted.
Yes No
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