Yamaha YZF-R25 Service Manual page 367

2. Check the entire signaling system
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-19.
OK ↓
Replace the horn.
The tail/brake light fails to come on.
1. Check the front brake light switch.
Refer to "CHECKING THE
SWITCHES" on page 8-77.
OK ↓
2. Check the rear brake light switch.
Refer to "CHECKING THE
SWITCHES" on page 8-77.
OK ↓
3. Check the entire signaling system
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-19.
OK ↓
Replace the tail/brake light.
The turn signal light, turn signal indicator light or both fail to blink.
1. Check the turn signal light bulbs
and sockets.
Refer to "CHECKING THE BULBS
AND BULB SOCKETS" on page
8-79.
OK ↓
2. Check the turn signal switch.
Refer to "CHECKING THE
SWITCHES" on page 8-77.
OK ↓
3. Check the turn signal relay.
Refer to "CHECKING THE RE-
LAYS" on page 8-85.
OK ↓
4. Check the entire signaling system
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-19.
OK ↓
NG →
Properly connect or replace the wiring har-
ness.
NG →
Replace the front brake light switch.
NG →
Replace the rear brake light switch.
NG →
Properly connect or replace the wiring har-
ness.
NG →
Replace the turn signal light bulb, socket or
both.
NG →
• The turn signal switch is faulty.
• Replace the left handlebar switch.
NG →
Replace the turn signal relay.
NG →
Properly connect or replace the wiring har-
ness.
8-22
SIGNALING SYSTEM