Yamaha YZF-R1S Service Manual - Elec
8-32
LIGHTING SYSTEM
ELEC
YES
NO
1. License plate light bulb and socket
S Check the license plate light bulb and socket
for continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
S Are the license plate light bulb and socket
OK?
Replace the license
plate light bulb, sock-
et or both.
EAS00792
2. The license plate light fails to come on.
YES
NO
2. Voltage
S 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
S Turn the main switch to “ON”.
S Measure the voltage (DC 12 V) of blue/red
on the license plate light coupler (wire
harness side).
S Is the voltage within specification?
1
This circuit is OK.
EAS00790
3. The tail / brake light fails to come on.
YES
NO
1. Voltage
S 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
S Turn the main switch to “ON”.
S Measure the voltage (DC 12 V) of blue/red
on the tail / brake light coupler (wire har-
ness side).
S Is the voltage within specification?
1
This circuit is OK.