Checking The Lighting System - Yamaha XT660R Service Manual

EAS00788

CHECKING THE LIGHTING SYSTEM

1. The headlight and the high beam indicator
light fail to come on.
1. Headlight bulb and socket
• Check the headlight bulb and socket for
continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the headlight bulb and socket OK?
YES
2. High beam indicator light LED
• Check the LED of the high beam indicator
light.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Is the high beam indicator light LED OK?
YES
3. Voltage
• Connect the pocket tester (DC 20 V) to the
headlight and meter assembly couplers as
shown.
È When the dimmer switch is set to "
É When the dimmer switch is set to "
Headlight coupler (wire harness end)
DC 20 V
+
NO
Replace the head-
light bulb, socket or
both.
NO
Replace the meter
assembly.
"
"
È
2
G
Y B
É
1 3
LIGHTING SYSTEM
Headlight
Positive tester probe →
Negative tester probe → black 3
High beam indicator light
Positive tester probe → yellow 4
Negative tester probe → black/white 5
Meter assembly couplers (wire harness end)
• Set the main switch to "ON".
• Start the engine.
• Set the dimmer switch to "
• Measure the voltage (DC 12 V) of yellow
1 or green 2 at the headlight coupler
(wire harness end) and yellow 4 at the
meter assembly coupler (wire harness
end).
• Is the voltage within specification?
This circuit is OK.
8 - 34
ELEC
yellow 1 or green 2
Ch R/G Y G/W Y/L
Dg G/L R/W B/W Lg
5
G G/L R/W B/W Lg
Ch R/G Y G/W Y/L
4
" or "
YES
The wiring
from the main switch
to the headlight cou-
pler or meter assem-
bly couplers is faulty
and must
repaired.
– +
".
NO
circuit
be