Checking The Lighting System - Yamaha MIO 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. 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 →
Negative tester probe → black 3
È When the dimmer switch is set to "
É When the dimmer switch is set to "
NO
Replace the head-
light bulb, socket or
both.
green 1 or yellow 2
"
"
LIGHTING SYSTEM
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 "
• 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?
This circuit is OK.
7 - 32
ELEC
AC20V
Br
5
Dg Ch
B G
".
" or "
YES
Replace the rectifier/
regulator.
– +
Y
4
".
NO