Yamaha YZF-R15, Service Manual

Page: 317 / 338

8-59
ELECTRICAL COMPONENTS
Check each switch for continuity with the multimeter. If the continuity reading is incorrect, check the
wiring connections and if necessary, replace the switch.
CAUTION:
Never insert the tester probes into the coupler terminal slots “a”. Always insert the probes from
the opposite end of the coupler, taking care not to loosen or damage the leads.
l
Before checking for continuity, set the multimeter to continuity mode.
l
When checking for continuity, switch back and forth between the switch positions a few times.
The switches and their terminal connections are illustrated as in the following example of the main
switch.
The switch positions “a” are shown in the far left column and the switch lead colors “b” are shown in the
top row.
The continuity (i. e., a closed circuit) between switch terminals at a given switch position is indicated by
“
”. There is continuity between red, and brown/blue when the switch is set to “ON”.
ON
R Br
OFF
R
Br
Multimeter
CHECKING THE BULBS AND BULB
SOCKETS
Check each bulb and bulb socket for damage or
wear, proper connections, and also for continuity
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 on the left.
• Bulbs “a” and “b” are used for the headlights
and usually use a bulb holder that must be de-
tached before removing the bulb. The majority
of these types of bulbs can be removed from
their respective socket by turning them coun-
terclockwise.
• Bulbs “c” is used for turn signal and tail/brake
lights and can be removed from the socket by
pushing and turning the bulb counterclockwise.
Checking the condition of the bulbs
The following procedure applies to all of the
bulbs.
1. Remove:
• Bulb
WARNING
Since headlight bulb get extremely hot, keep
flammable products and your hands away
from them until they have cooled down.
CAUTION:
• Be sure to hold the socket firmly when re-
moving the bulb. Never pull the lead, other-
wise it may be pulled out of the terminal in
the coupler.
• Avoid touching the glass part of a headlight
bulb to keep it free from oil, otherwise the
transparency of the glass, the life of the
bulb, and the luminous flux will be adverse-
ly affected. If the headlight bulb gets soiled,
thoroughly clean it with a cloth moistened
with alcohol or lacquer thinner.
2. Check:
• Bulb (for continuity)
(with the multimeter)
No continuity
→ Replace.
NOTE:
Before checking for continuity, set the multi
meter to continuity mode.
a. Connect the positive tester probe to terminal
“1” and the negative tester probe to terminal
“2”, and check the continuity.
b. Connect the positive tester probe to terminal
“1” and the negative tester probe to terminal
“3”, and check the continuity.
c. If either of the readings indicate no continuity,
replace the bulb.
Multimeter
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ELECTRICAL COMPONENTS