Yamaha Mio - Checking the Lighting System

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ELEC
LIGHTING SYSTEM
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
NO
Replace the head-
light bulb, socket or
both.
2. Voltage
• Connect the pocket tester (AC 20 V) to the
headlight connectors and high beam indi-
cator light connector and coupler as
shown.
Headlight
Positive tester probe
→
green
1
or yellow
2
Negative tester probe
→
black
3
È
When the dimmer switch is set to “ ”
É
When the dimmer switch is set to “ ”
High beam indicator light
Positive tester probe
→
yellow
4
Negative tester probe
→
black
5
• Set the main switch to “ON”.
• Start the engine.
• Set the light switch to “”.
• Set the dimmer switch to “” or “”.
• Measure the voltage (AC 12 V) of green
1
or yellow
2
on the headlight connector
(wire harness side) and yellow
4
on the
meter assembly connector.
• Is the voltage within specification?
YES
NO
This circuit is OK. Replace the rectifier/
regulator.
B
Br
Dg Ch
G
AC20V
Y
4
5