Yamaha YZF-R15, Service Manual

Page: 279 / 338

8-22 8-21
SIGNALING SYSTEM SIGNALING SYSTEM
• Any of the following fail to light: turn signal lights, brake light or indicator lights.
• The horn fails to sound.
• The fuel gauge fails to operate.
• Before troubleshooting, remove the following part(s):
1. Seat
2. Fuel tank
3. Headlight
NG →
OK ↓
NG →
OK ↓
NG →
OK ↓
NG →
OK ↓
The horn fails to sound.
NG →
OK ↓
NG →
OK ↓
1. Check the fuse.
Refer to “CHECKING THE FUSE”
on page 8-61. Replace the fuse.
2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY ” on
page 8-61. • Clean the battery terminals.
• Recharge or replace the battery.
3. Check the main switch.
Refer to “CHECKING THE
SWITCHES” on page 8-57. Replace the main switch.
4. Check the entire signaling system
wiring.
Refer to “CIRCUIT DIAGRAM” on
page 8-19. Properly connect or repair the signaling
system wiring.
Check the condition of each of the sig-
naling system circuits. Refer to
“Checking the signaling system”.
1. Check the horn switch.
Refer to “CHECKING THE
SWITCHES” on page 8-57.
The horn switch is faulty. Replace the left
handlebar switch.
2. Check the horn.
Refer to “CHECKING THE HORN”
on page 8-70. Replace the horn.
NG →
OK ↓
The tail/brake light fails to come on.
NG →
OK ↓
NG →
OK ↓
NG
→
OK ↓
NG →
OK ↓
The turn signal light, turn signal indicator light or both fail to blink.
NG →
OK ↓
NG →
OK ↓
3. Check the entire signaling system
wiring.
Refer to “CIRCUIT DIAGRAM” on
page 8-19. Properly connect or repair the signaling
system wiring.
This circuit is OK.
1. Check the tail/brake light bulb and
socket.
Refer to “CHECKING THE BULBS
AND BULB SOCKETS” on page
8-60.
Replace the tail/brake light bulb, socket or
both.
2. Check the front brake light switch.
Refer to “CHECKING THE
SWITCHES” on page 8-57. Replace the front brake light switch.
3. Check the rear brake light switch.
Refer to “CHECKING THE
SWITCHES” on page 8-57. Replace the rear brake light switch.
4. Check the entire signaling system
wiring.
Refer to “CIRCUIT DIAGRAM” on
page 8-19. Properly connect or repair the signaling
system wiring.
This circuit is OK.
1. Check the turn signal light bulb and
socket.
Refer to “CHECKING THE BULBS
AND BULB SOCKETS” on page
8-60.
Replace the turn signal light bulb, socket or
both.
2. Check the turn signal indicator light
bulb and socket.
Refer to “CHECKING THE BULBS
AND BULB SOCKETS” on page
8-60.
Replace the turn signal indicator light bulb,
socket or both.