Checking The Lighting System - Yamaha CS50 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
Replace the head-
light bulb, socket
or both.
2. Voltage
• Connect the pocket tester (DC 20 V) to the
headlight and high beam indicator light
couplers as shown.
A When the dimmer switch is set to "HI"
When the dimmer switch is set to "LO"
Headlight coupler (wire harness side)
Headlight
Positive tester probe
green
Negative tester probe
High beam indicator light
Positive tester probe
Negative tester probe
G
3
B
A
R
NO
yellow
black
yellow
black
Y
1 2
5
Gy Y GR L Ch Dg
Br B BY Sb G RY LG
Dg Ch L GR Y Gy
LG RY G Sb BY B Br
LIGHTING SYSTEM
Meter light coupler (wire harness side)
• Set the main switch to "ON".
• Start the engine.
• Set the dimmer switch to "HI" or "LO".
• Measure the voltage (DC 12 V) of yellow
or green
harness side).
• Is the voltage within specification?
YES
This circuit is OK.
EAS00789
2. The meter light fails to come on.
1. Meter light bulb and socket
• Check the meter light bulb and socket for
continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS"
• Are the meter light bulb and socket OK?
YES
or
2. Voltage
• Connect the pocket tester (DC 20 V) to the
meter light coupler (wire harness side) as
shown.
Positive tester probe
Negative tester probe
4
R
8-24
ELEC
on the headlight coupler (wire
NO
The wiring circuit
from the main
switch to the head-
light coupler is
faulty and must be
repaired.
NO
Replace the meter
light bulb, socket or
both.
blue
black
2
Gy Y GR L
R Br B BY Sb G RY
Dg Ch L GR Y Gy
LG RY G Sb BY B
1
Ch Dg
LG
Br R