Checking The Lighting System - Yamaha YZF-R1S 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
S Check the headlight bulb and socket for con-
tinuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
S Are the headlight bulb and socket OK?
YES
2. Voltage
S Connect the pocket tester (DC 20 V) to the
headlight and meter assembly couplers as
shown.
When the dimmer switch is set to "
A
When the dimmer switch is set to "
B
Headlight
Positive tester probe ! black
Negative tester probe ! black/green
Headlight coupler (wire harness side)
Low beam
A
NO
Replace the head-
light bulb, socket or
both.
"
"
1
2
8-31
LIGHTING SYSTEM
Headlight
Positive tester probe ! black
Negative tester probe ! black/yellow
Headlight coupler (wire harness side)
High beam
B
High beam indicator light (LEDs)
Positive tester probe ! black/ yellow
Negative tester probe !
Meter assembly coupler (wire harness side)
S Turn the main switch to "ON".
S Start the engine.
S Set the dimmer switch to "
S Measure the voltage (DC 12 V) of
black/green 2 or black/yellow
headlight coupler (wire harness side).
S Is the voltage within specification?
YES
This circuit is OK.
ELEC
3
4
6
5
black/white
" or " ".
4 on the
NO
The wiring circuit
from the main switch
to the headlight cou-
pler is faulty and
must be repaired.