2004 YAMAHA YZF-R1S bulb
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8-5
CHECKING THE BULBS AND BULB SOCKETSELEC
WARNING
EAS00732
CHECKING THE BULBS AND
BULB SOCKETS
Check each bulb and bulb socket for damage or
wear, proper connections, and also for continu-
ity 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 motorcycle 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
detached before removing the bulb. The ma-
jority of these types of bulbs can be removed
from their respective socket by turning them
counterclockwise.
Bulbs
C are 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
Since the headlight bulb gets extremely
hot, keep flammable products and your
hands away from the bulb until it has
cooled down.
When changing the tail / brake light bulb,
confirm that the frame has cooled accord-
ing to the warning label and change the
tail / brake light bulb.
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8-6
CHECKING THE BULBS AND BULB SOCKETSELEC
CAUTION:
NOTE:
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 the head-
light 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 pocket tester)
No continuity Replace.
Pocket tester
90890-03112, YU-3112
Before checking for continuity, set the pocket
tester to “0” and to the “Ω 1” range.
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.
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.
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8-7
CHECKING THE BULBS AND BULB SOCKETSELEC
NOTE:
NOTE:
WARNING
Pocket tester
90890-03112, YU-3112
Check each bulb socket for continuity in the
same manner as described in the bulb section;
however, note the following.
a. Install a good bulb into the bulb socket.
b. Connect the pocket tester probes to the re-
spective leads of the bulb socket.
c. Check the bulb socket for continuity. If any of
the readings indicate no continuity, replace
the bulb socket.
CHECKING THE LEDs
The following procedures applies to all of the
LEDs.
1. Check:
LED (for proper operation)
Improper operation Replace.
a. Disconnect the meter assembly coupler (me-
ter assembly side).
b. Connect two jumper leads
1 from the bat-
tery terminals to the respective coupler ter-
minal.
As for connecting with which coupler terminal,
refer to “CABLE ROUTING” in chapter 2.
A wire that is used as a jumper lead must
have at least the same capacity of the bat-
tery lead, otherwise the jumper lead may
burn.
This check is likely to produce sparks,
therefore, make sure no flammable gas or
fluid is in the vicinity.
c. When the jumper leads are connected to the
terminals the respective LED should illumi-
nate.
Does not light Replace the meter assem-
bly.
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8-31
High beam indicator light (LEDs)
Positive tester probe black / yellow
Negative tester probe
black / white
YESNO 1. Headlight bulb and socket
Check the headlight bulb and socket for con-
tinuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
Are the headlight bulb and socket OK?
Replace the head-
light bulb, socket or
both.
YESNO 2. Voltage
Connect the pocket tester (DC 20 V) to the
headlight and meter assembly couplers as
shown.
The wiring circuit
from the main switch
to the headlight cou-
pler is faulty and
must be repaired.
When the dimmer switch is set to “ ”
When the dimmer switch is set to “ ”
Headlight coupler (wire harness side)
Low beam
Headlight
Positive tester probe black
Negative tester probe black / green
1
2
Meter assembly coupler (wire harness side)
Turn the main switch to “ON”.
Start the engine.
Set the dimmer switch to “ ” or “ ”.
Measure the voltage (DC 12 V) of
black / green or black / yellow on the
headlight coupler (wire harness side).
Is the voltage within specification?
2
This circuit is OK.
A
B
Headlight
Positive tester probe black
Negative tester probe black / yellow
A
Headlight coupler (wire harness side)
High beam
B
6
5
3
4
4
LIGHTING SYSTEMELEC
EAS00788
CHECKING THE LIGHTING SYSTEM
1. The headlight and the high beam indicator
light fail to come on.
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8-32
LIGHTING SYSTEMELEC
YESNO 1. License plate light bulb and socket
Check the license plate light bulb and socket
for continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
Are the license plate light bulb and socket
OK?
Replace the license
plate light bulb, sock-
et or both.
EAS007922. The license plate light fails to come on.
YESNO 2. Voltage
Connect the pocket tester (DC 20 V) to the
license plate light coupler (wire harness light
side) as shown.
The wiring circuit
from the main switch
to the license plate
light coupler is faulty
and must be re-
paired. Positive tester probe blue / red
Negative tester probe black
1
2
Turn the main switch to “ON”.
Measure the voltage (DC 12 V) of blue / red
on the license plate light coupler (wire
harness side).
Is the voltage within specification?
1
This circuit is OK.
EAS00790
3. The tail / brake light fails to come on.
YESNO 1. Voltage
Connect the pocket tester (DC 20 V) to the
tail / brake light coupler (wire harness side)
as shown.
Wiring circuit from
the main switch to
the tail / brake light
coupler is faulty and
must be repaired. Positive tester probe blue / red
Negative tester probe black
1
2
Turn the main switch to “ON”.
Measure the voltage (DC 12 V) of blue / red
on the tail / brake light coupler (wire har-
ness side).
Is the voltage within specification?
1
This circuit is OK.
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8-33
LIGHTING SYSTEMELEC
EAS00791
4. The auxiliary light fails to come on.
YESNO 1. Auxiliary light and socket
Check the auxiliary light bulb and socket for
continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
Are the auxiliary light .bulb and socket OK?
Replace the auxiliary
light bulb, socket or
both.
YESNO 2. Voltage
Connect the pocket tester (DC 20 V) to the
auxiliary light coupler (auxiliary light side) as
shown.
The wiring circuit
from the main switch
to the auxiliary light
coupler is faulty and
must be repaired. Positive tester probe blue / red
Negative tester probe black
1
Turn the main switch to “ON”.
Measure the voltage (DC 12 V) of blue / red
on the auxiliary light coupler (auxiliary
light side).
Is the voltage within specification?
2
This circuit is OK.
2
5. The turn signa l/ position light fails to come on.
YESNO 1. Turn signal / position light and socket
Check the turn signal / position light bulb and
socket for continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
Are the turn signal / position light bulb and
socket OK?
Replace the turn sig-
nal / position light
bulb, socket or both.
YESNO 2. Voltage
Connect the pocket tester (DC 20 V) to the
turn signal / position light coupler (wire har-
ness side) as shown.
The wiring circuit from
the main switch to the
turn signal / position
light coupler is faulty
and must be repaired. Turn the main switch to “ON”.
Measure the voltage (DC 12 V) of blue or
blue on the turn signal / position light cou-
pler (wire harness side).
Is the voltage within specification?
3
This circuit is OK.
Left turn signal / position light
Positive tester probe blue
Negative tester probe black
Right turn signal / position light
Positive tester probe blue
Negative tester probe black
1
2
A
Left turn signal / position light
Right turn signal / position light
B
A
B
3
4
1
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SIGNALING SYSTEMELEC
YESNO 1. Tail / brake light bulb and socket
Check the tail / brake light bulb and socket for
continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
Are the tail / brake light bulb and socket OK?
Replace the tail /
brake light bulb,
socket or both.
EAS007972. The tail / brake light fails to come on.
YESNO 2. Brake light switches
Check the brake light switches for continuity.
Refer to “CHECKING THE SWITCHES”.
Is the brake light switch OK?
Replace the brake
light switch.
3. Voltage
Connect the pocket tester (DC 20 V) to the
tail / brake light coupler (wire harness side)
as shown.
Positive tester probe yellow
Negative tester probe black
1
2
Turn the main switch to “ON”.
Pull in the brake lever or push down on the
brake pedal.
Measure the voltage (DC 12 V) of yellow
on the tail / brake light coupler (wire harness
side).
Is the voltage within specification?
1
YESNO 2. Voltage
Connect the pocket tester (DC 20 V) to the
horn connector at the horn terminal as
shown.
The wiring circuit
from the main switch
to the horn connec-
tor is faulty and must
be repaired. Positive tester probe black / white
Negative tester probe ground
1
Turn the main switch to “ON”.
Push the horn switch.
Measure the voltage (DC 12 V) of
black / white at the horn terminal.
Is the voltage within specification?
NOYES 3. Horn
Disconnect the black connector at the horn
terminal.
Connect a jumper lead to the horn termi-
nal and ground the jumper lead.
Turn the main switch to “ON”.
Push the horn switch.
Does the horn sound?
The horn is OK.
1
Replace the horn.
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SIGNALING SYSTEMELEC
YESNO 2. Voltage
Connect the pocket tester (DC 20 V) to the
meter assembly coupler (wire harness side)
as shown.
The wiring circuit
from the main switch
to the meter assem-
bly coupler is faulty
and must be re-
paired. Positive tester probe green / white
Negative tester probe black / white
1
2
Turn the main switch to “ON”.
Measure the voltage (DC 12 V) of
green / white and black / white at the
meter assembly coupler.
Is the voltage within specification?
This circuit is OK.
12
Replace the multi-
function meter.
NO
1. Multi-function meter bulb socket
Check the multi-function meter bulb socket
for continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
Is the multi-function meter bulb socket OK?
YES
EAS008067. The speedometer fails to come on.
2. Speed sensor
Connect the pocket tester (DC 20 V) to the
speed sensor coupler (wire harness side)
as shown.
Replace the speed
sensor.
NOYES
Positive tester probe white / yellow
Negative tester probe black / blue1
2
Set the main switch to “ON”.
Elevate the rear wheel and slowly rotate it.
Measure the voltage (DC 5 V) of white / yel-
low and blue. With each full rotation of the
rear wheel, the voltage reading should cycle
from 0.6 V to 4.8 V to 0.6 V to 4.8 V.
Does the voltage reading cycle correctly?
This circuit is OK.
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