Signaling System Troubleshooting - Yamaha YZF-R25 Service Manual

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EAS30501
TROUBLESHOOTING
• Any of the following fail to light: a turn signal light, the brake light or an indicator light.
• The horn fails to sound.
• The fuel meter fails to come on.
• The speedometer fails to operate.
TIP
• Before troubleshooting, remove the following part(s):
1. Passenger seat
2. Center cover
3. Rider seat
4. Side covers
5. Fuel tank
6. Drive sprocket cover
7. Front bottom cowlings
1. Check the fuses.
(Ignition, signaling system, backup,
and main)
Refer to "CHECKING THE FUS-
ES" on page 8-81.
OK ↓
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-82.
OK ↓
3. Check the main switch.
Refer to "CHECKING THE
SWITCHES" on page 8-77.
OK ↓
4. Check the entire signaling system
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-19.
OK ↓
Check the condition of each of the sig-
naling system circuits. Refer to
"Checking the signaling system".
Checking the signaling system
The horn fails to sound.
1. Check the horn switch.
Refer to "CHECKING THE
SWITCHES" on page 8-77.
OK ↓
NG →
Replace the fuse(s).
NG →
• Clean the battery terminals.
• Recharge or replace the battery.
NG →
Replace the main switch.
NG →
Properly connect or replace the wiring har-
ness.
NG →
• The horn switch is faulty.
• Replace the left handlebar switch.
8-21
SIGNALING SYSTEM

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