Yamaha YZF-R1S Service Manual page 425

EAS00792
2. The license plate light fails to come on.
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?
YES
2. Voltage
S Connect the pocket tester (DC 20 V) to the
license plate light coupler (wire harness light
side) as shown.
Positive tester probe ! blue/red
Negative tester probe ! black
S Turn the main switch to "ON".
S Measure the voltage (DC 12 V) of blue/red
on the license plate light coupler (wire
1
harness side).
S Is the voltage within specification?
YES
This circuit is OK.
NO
Replace the license
plate light bulb, sock-
et or both.
1
2
NO
The wiring circuit
from the main switch
to the license plate
light coupler is faulty
and must be re-
paired.
8-32
LIGHTING SYSTEM
EAS00790
3. The tail/brake light fails to come on.
1. Voltage
S Connect the pocket tester (DC 20 V) to the
tail/brake light coupler (wire harness side)
as shown.
Positive tester probe ! blue/red
Negative tester probe ! black
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-
1
ness side).
S Is the voltage within specification?
YES
This circuit is OK.
ELEC
1
2
NO
Wiring circuit from
the main switch to
the tail/brake light
coupler is faulty and
must be repaired.