Yamaha 2002 CS50, Service Manual, Page: 189 / 204

ELEC
SIGNALING SYSTEM
8-30
EAS00798
2. The tail/brake light fails to come on.
1. Tail/brake light bulb and socket
• 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?
2. Brake light switches
• Check the brake light switches for conti-
nuity.
Refer to “CHECKING THE SWITCHES”.
• Is the brake light switch OK?
3. Voltage
• Connect the pocket tester (DC 20 V) to the
tail/brake light coupler (wire harness side)
as shown.
Positive tester probe green/yellow
Negative tester probe black
• Set the main switch to “ON”.
• Pull in the brake levers.
• Measure the voltage (DC 12 V) of
green/yellow on the tail/brake light cou-
pler (wire harness side).
• Is the voltage within specification?
EAS00799
3. The turn signal light, turn signal indicator
light or both fail to blink.
1. Turn signal indicator light bulb and socket
• Check the turn signal light bulb and socket
for continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”
• Are the turn signal light bulb and socket
OK?
2. Turn signal switch
• Check the turn signal switch for continuity.
Refer to “CHECKING THE SWITCHES”.
• Is the turn signal switch OK?
Replace the
tail/brake light bulb,
socket or both.
Replace the brake
light switch.
L
G/Y
B
2
1
The wiring circuit
from the main
switch to the
tail/brake light cou-
pler is faulty and
must be repaired. This circuit is OK.
Replace the turn
signal light bulb,
socket or both.
Replace the left
handlebar switch.
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO