Yamaha XC50V Service Manual page 277

EAS00798
2. The tail/brake light fails to come on.
1. Tail/brake light bulb and socket
8 Check the tail/brake light bulb and socket
for continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS"
8 Are the tail/brake light bulb and socket
OK?
YES
2. Brake light switches
8 Check the brake light switches for conti-
nuity.
Refer to "CHECKING THE SWITCHES".
8 Is the brake light switch OK?
YES
The wiring circuit from
the main switch to the
tail/brake light bulb
connector is faulty
and must be repaired.
Refer to "CIRCUIT
DIAGRAM".
NO
Replace the tail/brake
light bulb, socket or
both.
NO
Replace the brake
light switch.
SIGNALING SYSTEM
3. Voltage
8 Connect the pocket tester (DC 20 V) to
the tail/brake light coupler (wire harness
side) as shown.
Positive tester probe
Negative tester probe
8 Set the main switch to "ON".
8 Pull in the brake levers.
8 Measure the voltage (DC 12 V) of green/
yellow 1 on the tail/brake light coupler
(wire harness side).
8 Is the voltage within specification?
YES
This circuit is OK.
8-35
-
ELEC
green/ yellow 1 1 1 1 1
black 2 2 2 2 2
1
L
G/Y G/Y
L
2
-
B
- B
Dg
Dg Ch Ch
NO
The wiring circuit
from the main switch
to the tail/brake light
coupler is faulty and
must be repaired.
Refer to "CIRCUIT
DIAGRAM".
+