Yamaha YBR250 2007, Service Manual

Page: 340 / 361

ELEC
LIGHTING SYSTEM
2. The tail/brake light fails to come on.
7-30
• Set the main switch to "ON"
• Measure the voltage (DC 12 V) of blue
1
on the brake light coupler (wire harness).
• Is the voltage within specification?
• 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?
YES NO
YES NO
1. Tail/brake light bulb and socket
Replace the tail/brake
light bulb, socket or
both.
2. Voltage
• Connect the pocket tester (DC 20 V) to the
tail light coupler (wire harness), as shown.
Positive tester probe --> blue
1
Negative tester probe -->black
2
The circuit is OK.
The wiring circuit from
the main switch to the
meter assembly
coupler is faulty and
must be repaired.
Y L
Y
L
B
Ch
Dg
21/5W
2
1
• Set the main switch to ‘ON‘
• Measure the voltage (DC 12V) of blue/red
1
on the auxiliary light coupler (wire
harness).
• Is the voltage within specification?
• Check the auxiliary light bulb and socket
for continuity.
Refer to “CHECKING THE BULB AND
BULB SOCKETS”.
• Are the auxiliary light bulb and socket OK?
YES NO
YES NO
1. Auxiliary light bulb and socket.
Replace the auxiliary
light bulb, socket, or
both.
2. Voltage
• Connect the pocket tester (DC 20 V) to
the auxiliary light coupler (wire harness),
as shown.
Positive tester probe --> blue/red
1
Negative tester probe -->black
2
The circuit is OK.
The wiring circuit from
the main switch to the
auxiliary light coupler
is faulty and must be
repaired.
3. The auxiliary light fails to come on.