Yamaha YZF-R1S, Service Manual

Page: 426 / 457

8-33
LIGHTING SYSTEM
ELEC
EAS00791
4. The auxiliary light fails to come on.
YES NO
1. Auxiliary light and socket
S
Check the auxiliary light bulb and socket for
continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
S
Are the auxiliary light .bulb and socket OK?
Replace the auxiliary
light bulb, socket or
both.
YES NO
2. Voltage
S
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
S
Turn the main switch to “ON”.
S
Measure the voltage (DC 12 V) of blue / red
on the auxiliary light coupler (auxiliary
light side).
S
Is the voltage within specification?
2
This circuit is OK.
2
5. The turn signal/position light fails to come on.
YES NO
1. Turn signal / position light and socket
S
Check the turn signal / position light bulb and
socket for continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
S
Are the turn signal / position light bulb and
socket OK?
Replace the turn sig-
nal / position light
bulb, socket or both.
YES NO
2. Voltage
S
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.
S
Turn the main switch to “ON”.
S
Measure the voltage (DC 12 V) of blue or
blue on the turn signal / position light cou-
pler (wire harness side).
S
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