Yamaha 2004 YP400 Service Manual page 372

EAS00786
5. Pass switch
• Check the pass switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the pass switch OK?
YES
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?
YES
NO
The pass switch is
faulty. Replace the
left handlebar switch.
NO
The storage box light
switch is faulty.
Replace the storage
box light switch.
LIGHTING SYSTEM
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
3
4
2
W/B
G/L
R/Y
• Does the headlight relay 1 have continuity
between red/yellow and green/blue?
8 - 28
ELEC
+
1
R/Y
YES
Replace the head-
light relay 1.
– +
NO