Checking The Lighting System - Yamaha YP250R 2005 Service Manual

EAS00788

CHECKING THE LIGHTING SYSTEM

1. The headlights 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 (DC 20 V) to the
headlight (wire harness side) and meter
assembly couplers as shown.
È When the dimmer/pass switch is set to "
É When the dimmer/pass switch is set to "
Headlight
Positive tester probe →
Negative tester probe → black 3
Headlight coupler
1
DC 20V
É
È
2
NO
Replace the head-
light bulb, socket or
both.
yellow 1 or green 2
3
Y B B Y
G Br L G
LIGHTING SYSTEM
High beam indicator light
Positive tester probe → yellow 4
Negative tester probe → black 5
Meter assembly coupler
• Set the main switch to "ON".
• Start the engine.
• Set the dimmer/pass switch to "
" ".
• Measure the voltage (DC 12 V) of yellow
1 (green 2) on the headlight coupler
(wire harness side) and yellow 4 on the
meter assembly coupler.
• Is the voltage within specification?
"
"
Replace the CDI unit
or meter assembly.
8 - 27
ELEC
4
G/L B Dg Y Sb O/W Br/G Br/G
G/R B Gy Br
Gy/B
5
YES
The wiring
from the main switch
to the headlight cou-
pler or meter assem-
bly coupler is faulty
and must
paired.
– +
Ch Gy/R
R/L
" or
NO
circuit
be re-