Yamaha XT660R S Service Manual page 416

EAS00784
4. Dimmer switch
• Check the dimmer switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the dimmer switch OK?
YES
EAS00786
5. Pass switch
• Check the pass switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the pass switch OK?
YES
NO
The dimmer switch is
faulty. Replace the
left handlebar switch.
NO
The pass switch is
faulty. Replace the
left handlebar switch.
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LIGHTING SYSTEM
6. Headlight relay
• Disconnect the headlight relay from the wire
harness.
• Connect the pocket tester (Ω × 1) and bat-
tery (12 V) to the headlight relay terminal as
shown.
• Check the headlight relay for continuity.
Battery positive terminal → red/yellow 1
Battery negative terminal →
Positive tester probe → red/blue 3
Negative tester probe → blue/white 4
3
4
2
Y/B
L/W
R/L
• Does the headlight relay have continuity
between red/blue and blue/white?
EAS00787
7. Wiring
• Check the entire lighting system's wiring.
Refer to "CIRCUIT DIAGRAM".
• Is the lighting system's wiring properly
connected and without defects?
Check the condition
of each of the lighting
system's circuits.
Refer to "CHECK-
ING THE LIGHTING
SYSTEM".
8 - 33
ELEC
yellow/black 2
+
1
R/Y
YES
Replace the head-
light relay.
YES
Properly connect or
repair the
system's wiring.
– +
NO
NO
lighting