Yamaha XV1700P Service Manual page 480

Speedometer assembly coupler
• Set the main switch to "ON".
• Measure the voltage (DC 12 V) of brown
1 on the tachometer and speedometer
light couplers.
• Is the voltage within specification?
YES
This circuit is OK.
EAS00790
3. The tail/brake light fails to come on.
1. Tail/brake light LED
• Check the LED of the tail/brake light.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the tail/brake light LED OK?
YES
4
Dg Lg B
3
Ch Y Br
Ch Y Br
Dg Lg B
NO
The wiring circuit
from the main switch
to the tachometer
and speedometer
light couplers is faulty
and must be
repaired.
NO
Replace the tail/
brake light assembly.
7 - 42
LIGHTING SYSTEM
2. Voltage
• Connect the pocket tester (DC 20 V) to the
tail/brake light assembly coupler (tail sub-
wire harness side) as shown.
Positive tester probe → blue 1
Negative tester probe → black 2
• Set the main switch to "ON".
• Measure the voltage (DC 12 V) of blue 1
on the tail/brake light assembly coupler
(tail sub-wire harness side).
• Is the voltage within specification?
YES
Replace the tail/
brake light assembly.
EAS00791
4. The license plate light fails to come on.
1. License plate light bulb and socket
• Check the license plate light bulb and
socket for continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the license plate light bulb and socket
OK?
YES
– +
ELEC
1
L Y Y L
B B
2
NO
The wiring circuit
from the main switch
to the tail/brake light
assembly coupler is
faulty and must be
repaired.
NO
Replace the license
plate light bulb,
socket or both.