Yamaha MT-09 2021 Service Manual page 389

Checking the signaling system
The horn fails to sound.
1. Check the horn switch.
Refer to "CHECKING THE
SWITCHES" on page 8-53.
OK↓
2. Check the horn.
Refer to "CHECKING THE HORN"
on page 8-62.
OK↓
3. Check the entire signaling sys-
tem's wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-29.
OK↓
This circuit is OK.
The tail/brake light fails to come on.
1. Check the front brake light switch.
Refer to "CHECKING THE
SWITCHES" on page 8-53.
OK↓
2. Check the rear brake light switch.
Refer to "CHECKING THE
SWITCHES" on page 8-53.
OK↓
3. Check the entire signaling sys-
tem's wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-29.
OK↓
This circuit is OK.
The turn signal light, turn signal indicator light or both fail to blink.
1. Check the turn signal switch.
Refer to "CHECKING THE
SWITCHES" on page 8-53.
OK↓
2. Check the hazard switch.
Refer to "CHECKING THE
SWITCHES" on page 8-53.
NG→ Replace the handlebar switch (left).
NG→ Replace the horn.
Properly connect or repair the signaling
NG→
system's wiring.
NG→ Replace the front brake light switch.
NG→ Replace the rear brake light switch.
Properly connect or repair the signaling
NG→
system's wiring.
NG→ Replace the handlebar switch (left).
NG→ Replace the handlebar switch (left).
8-34
SIGNALING SYSTEM