Yamaha YZF-R1 2003, Supplementary Service Manual

Page: 27 / 36

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SIGNALING SYSTEM
ELEC
NO
YES
1. Turn signal indicator light bulb and socket
S
Check the turn signal light bulb and socket
for continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”
S
Are the turn signal light bulb and socket OK?
Replace the turn sig-
nal light bulb, socket
or both.
CHECKING THE SIGNALING SYSTEM
EAS00799
1. The turn signal light, turn signal indicator
light or both fail to blink.
YES
2. Turn signal switch
S
Check the turn signal switch for continuity.
Refer to “CHECKING THE SWITCHES”.
S
Is the turn signal switch OK?
Replace the left han-
dlebar switch.
4. Voltage
S
Connect the pocket tester (DC 20 V) to the
turn signal relay coupler (wire harness side)
as shown.
Positive tester probe
!
brown
Negative tester probe
!
ground
1
S
Set the main switch to “ON”.
S
Measure the voltage (DC 12 V) on brown
at the turn signal relay coupler (wire harness
side).
S
Is the voltage within specification?
1
YES NO
The wiring circuit
from the main switch
to the turn signal
relay coupler is faulty
and must be re-
paired.
YES NO
5. Voltage
S
Connect the pocket tester (DC 20 V) to the
turn signal relay coupler (wire harness side)
as shown.
The turn signal relay
is faulty and must be
replaced.
Positive tester probe
!
brown / white
Negative tester probe
!
ground
1
S
Set the main switch to “ON”.
S
Measure the voltage (DC 12 V) on
brown / white
at the turn signal relay cou-
pler (wire harness side).
S
Is the voltage within specification?
1
6. Voltage
S
Connect the pocket tester (DC 20 V) to the
turn signal light connector or meter assem-
bly coupler (wire harness side) as shown.
Left turn signal light
Right turn signal light
Turn signal indicator light
A
B
C
YES
3. Hazard switch
S
Check the hazard switch for continuity.
Refer to “CHECKING THE SWITCHES”.
S
Is the hazard switch OK?
Replace the left han-
dlebar switch.
NO
NO