Yamaha VMX12 2001 Service Manual page 430

EAS00797
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?
YES
2. Brake light switches
• Check the brake light switches for continu-
ity.
Refer to "CHECKING THE SWITCHES".
• Is the brake light switch OK?
YES
3. Voltage
• Connect the pocket tester (DC 20 V) to the
tail/brake light connectors (wire harness
side) as shown.
Positive tester probe → yellow 1
Negative tester probe → black 2
NO
Replace the tail/
brake light bulb,
socket or both.
NO
Replace the brake
light switch.
SIGNALING SYSTEM
• Set the main switch to "ON".
• Pull in the brake lever or push down on the
brake pedal.
• Measure the voltage (12 V) of yellow 1 on
the tail/brake light connectors (wire harness
side).
• Is the voltage within specification?
This circuit is OK.
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?
8 - 38
ELEC
YES
The wiring
from the main switch
to the meter light
coupler is faulty and
must be repaired.
YES
Replace the turn sig-
nal light bulb, socket
or both.
YES
Replace the left han-
dlebar switch.
– +
NO
circuit
NO
NO