Yamaha YZF-R1 2012, Service Manual, Page: 525 / 556

ELECTRICAL COMPONENTS
8-128
EAS27990
CHECKING THE BULBS AND BULB SOCK-
ETS
TIP
Do not check any of the lights that use LEDs.
Check each bulb and bulb socket for damage
or wear, proper connections, and also for conti-
nuity between the terminals.
Damage/wear
→
Repair or replace the bulb,
bulb socket or both.
Improperly connected
→
Properly connect.
No continuity
→
Repair or replace the bulb,
bulb socket or both.
Types of bulbs
The bulbs used on this vehicle are shown in
the illustration.
• Bulbs “a” are used for the headlights and
usually use a bulb holder that must be
detached before removing the bulb.
• Bulbs “b” are used for turn signal lights and
can be removed from the socket by pushing
and turning the bulb counterclockwise.
• Bulbs “c” are used for auxiliary and license
plate lights and can be removed from their
respective socket by carefully pulling them
out.
Checking the condition of the bulbs
The following procedure applies to all of the
bulbs.
1. Remove:
• Bulb
WARNING
EWA13320
Since the headlight bulb gets extremely
hot, keep flammable products and your
hands away from the bulb until it has
cooled down.
ECA14380
• Be sure to hold the socket firmly when
removing the bulb. Never pull the lead,
otherwise it may be pulled out of the ter-
minal in the coupler.
• Avoid touching the glass part of the head-
light bulb to keep it free from oil, other-
wise the transparency of the glass, the
life of the bulb, and the luminous flux will
be adversely affected. If the headlight
bulb gets soiled, thoroughly it with a cloth
moistened with alcohol or lacquer thin-
ner.
2. Check:
• Bulb (for continuity)
(with the pocket tester)
No continuity
→
Replace.
TIP
Before checking for continuity, set the pocket
tester to “0” and to the “
Ω ×
1” range.
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Connect the positive tester probe to termi-
nal “1” and the negative tester probe to ter-
minal “2”, and check the continuity.
b. If reading indicate no continuity, replace the
bulb.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
Checking the condition of the bulb sockets
The following procedure applies to all of the
bulb sockets.
1. Check:
• Bulb socket (for continuity)
(with the pocket tester)
No continuity
→
Replace.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C