Yamaha XT660R Service Manual page 415

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.
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
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
+
R/Y
YES
Replace the head-
light relay.
YES
Properly connect or
repair the
system's wiring.
– +
NO
NO
lighting