Yamaha VMX12 2001 Service Manual page 425

EAS00790
3. 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. Voltage
• Connect the pocket tester (DC 20 V) to the
tail/brake light coupler (wire harness side)
as shown.
Positive tester probe → blue 1
Negative tester probe → black 2
• Set the main switch to "ON".
• Set the light switch to "
• Measure the voltage (12 V) of blue 1 on
the tail/brake light connectors (wire harness
side).
• Is the voltage within specification?
YES
This circuit is OK.
NO
Replace the tail/
brake light bulb,
socket or both.
" or " ".
NO
The wiring circuit
from the main switch
to the tail/brake light
connectors is faulty
and must be
repaired.
LIGHTING SYSTEM
EAS00791
4. The auxiliary light fails to come on.
1. Auxiliary light bulb and socket
• Check the auxiliary light bulb and socket for
continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the auxiliary light bulb and socket OK?
2. Voltage
• Connect the pocket tester (DC 20 V) to the
auxiliary light connectors (auxiliary light
side) as shown.
Positive tester probe → blue/red 1
Negative tester probe → black 2
• Set the main switch to "ON".
• Set the light switch to "
• Measure the voltage (12 V) of blue/red 1
on the auxiliary light connectors (wire har-
ness side).
• Is the voltage within specification?
This circuit is OK.
8 - 33
ELEC
YES
Replace the auxiliary
light bulb, socket or
both.
" or "
YES
The wiring
from the main switch
to the auxiliary light
connectors is faulty
and must
repaired.
– +
NO
".
NO
circuit
be