Yamaha YZF-R1 1998 Service Manual page 378

Headlight
Tester positive probe →
black/yellow 1 or black/blue 2
Tester negative probe → black 3
High beam indicator light
Tester positive probe → yellow 4
Tester negative probe → black 5
Meter assembly coupler (wire harness
side)
• Set the main switch to "ON".
• Set the light switch to "
• Set the dimmer switch to "
" ".
• Measure the voltage (12 V) of black/yel-
low (black/blue) 2 on the headlight cou-
pler (headlight side).
• Is the voltage within specification?
YES
4.Headlight relay
• Disconnect the headlight relay from the
coupler.
• Connect the pocket tester (Ω × 1) and
battery (12 V) to the headlight relay ter-
minals as shown.
Battery positive terminal →
Battery negative terminal →
black/yellow (black/blue) 2
Tester positive probe →
white/yellow (white/green) 3
Tester negative probe → black 4
".
" or
NO
The wiring circuit
from the main
switch to the head-
light coupler is
faulty and must be
repaired.
red/yellow 1
LIGHTING SYSTEM
• Does the headlight relay have continuity
between white/yellow (white/green) and
black?
This circuit is OK.
EB805411
2. A 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?
2.Voltage
• Connect the pocket tester (20 V) to the
meter assembly coupler (wire harness
side) as shown.
Tester positive probe → blue 1
Tester negative probe → black 2
8 - 32
ELEC
YES
Replace the head-
light relay.
YES
Replace the meter
light bulb, socket or
both.
– +
NO
NO