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–+
ELEC
EAS00790
3. The tail/brake light fails to come on.
YES
NO
YES
NO
EAS00791
4. The auxiliary light fails to come on.
YES
NO
YES
NO
1. Tail/brake light bulb and socket
• Check the tail/brake light bulb and socket
for continuity.
• Are the tail/brake light bulb and socket OK?
Replace the tail/
brake light bulb,
socket or both.
2. Voltage
• Connect the pocket tester (DC 20 V) to the
tail/brake light coupler (wire harness side)
as shown.
Tester positive probe
→
blue/red
1
Tester negative probe
→
black
2
• Set the main switch to “ON”.
• Set the light switch to “ ” or “ ”.
• Measure the voltage (12 V) of blue/red
1
on the tail/brake light coupler (wire harness
side).
• Is the voltage within specification?
This circuit is OK. wiring circuit from the
main switch to the
tail/brake light cou-
pler is faulty and
must be repaired.
Ch
Y
L
B
Dg
Dg
Y
BL/R
Ch
1. Auxiliary light bulb and socket
• Check the auxiliary light bulb and socket for
continuity.
• Are the auxiliary light bulb and socket OK?
Replace the auxiliary
light bulb, socket or
both.
2. Voltage
• Connect the pocket tester (DC 20 V) to the
auxiliary light couplers (wire harness side)
as shown.
Tester positive probe
→
blue/red
1
Tester negative probe
→
black
2
• Set the main switch to “ON”.
• Set the light switch to “ ” or “ ”.
• Measure the voltage (12 V) of blue/red
1
on the auxiliary light couplers (wire harness
side).
• Is the voltage within specification?
This circuit is OK. The wiring circuit
from the main switch
to the auxiliary light
couplers is faulty and
must be repaired.
B
L/R
LIGHTING SYSTEM
