Yamaha 2004 YP400, Service Manual, Page: 372 / 417

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– +
ELEC
LIGHTING SYSTEM
EAS00786
YES
NO
YES
NO
YES NO
5. Pass switch
• Check the pass switch for continuity.
Refer to “CHECKING THE SWITCHES”.
• Is the pass switch OK?
The pass switch is
faulty. Replace the
left handlebar switch.
6. Storage box light switch
• Check the storage box light switch for con-
tinuity.
Refer to “CHECKING THE SWITCHES”.
• Is the storage box light switch OK?
The storage box light
switch is faulty.
Replace the storage
box light switch.
7. Headlight relay 1
• Remove the headlight relay 1.
• Connect the pocket tester (
Ω ×
1) and bat-
tery (12 V) to the headlight relay 1 terminals
as shown.
• Check the headlight relay 1 for continuity.
Positive battery terminal
→
red/yellow
1
Negative battery terminal
→
white/black
2
Positive tester probe
→
red/yellow
3
Negative tester probe
→
green/blue
4
• Does the headlight relay 1 have continuity
between red/yellow and green/blue?
Replace the head-
light relay 1.
+
R/Y
G/L
R/Y W/B
1
2
4
3