Yamaha 2008 Raptor 250, Service Manual

Page: 300 / 311

ELEC
7-33
EBS01075
CHECKING THE SIGNALING SYSTEM
EBS01076
1. The tail/brake light fails to come on.
1. Tail/brake light bulb and bulb socket
(4D31)
• Check the tail/brake light bulb and bulb
socket for continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
• Are the tail/brake light bulb and bulb socket
OK?
YES
NO
Replace the tail/
brake light bulb, bulb
socket or both.
2. Tail/brake light (4D35, 4D39)
• Disconnect the tail/brake light coupler.
• Connect the battery (12 V) to the tail/brake
light coupler terminals as shown.
• When the jumper leads are connected to
the terminals, the tail/brake light should illu-
minate.
Positive battery terminal
→
yellow
Negative battery terminal
→
black
• Is the tail/brake light OK?
YES
NO
Replace the tail/
brake light.
3. Brake light switches
• Check the brake light switches for continuity.
Refer to “CHECKING THE SWITCHES”.
• Is the brake light switch OK?
YES
NO
Replace the brake
light switch.
4. Voltage
• Connect the pocket tester (DC 20 V) to the
tail/brake light coupler (wire harness side)
as shown.
Positive tester probe
→
yellow
Negative tester probe
→
black
• Set the main switch to “ON”.
• Pull in the brake lever or push down on the
brake pedal.
• Measure the voltage (DC 12 V) of yellow
on the tail/brake light coupler (wire harness
side).
• Is the voltage within specification?
YES
NO
This circuit is OK. The wiring circuit
from the main switch
to the tail/brake light
coupler is faulty and
must be repaired.
SIGNAL SYSTEM