relay YAMAHA WR 450F 2016 Owner's Manual

ELECTRIC STARTING SYSTEM
9-8
EAS2GC1362STARTING CIRCUIT CUT-OFF SYSTEM OPERATION
If the meter light comes on, the starter motor can only operate if at least one of the following condi-
tions is met:
• The transmission is in neutral (the neutral switch is closed).
• The clutch lever is pulled to the handlebar (the clutch switch is closed).
The starting circuit cut-off relay prevents the starter motor from operating when neither of these con-
ditions has been met. In this instance, the starting ci rcuit cut-off relay is open so current cannot reach
the starter motor. When at least one of the above conditions has been met the starting circuit cut-off
relay is closed and the engine can be started by pressing the start switch.

ELECTRIC STARTING SYSTEM
9-9
a. WHEN THE TRANSMISSION IS IN NEU-TRAL
b. WHEN THE CLUTCH LEVER IS PULLED TO THE HANDLEBAR
1. Battery
2. Main fuse
3. Main relay
4. Starting circuit cut-off relay
5. Start switch
6. Diode
7. Clutch switch
8. Neutral switch
9. Starter relay
10.Starter motor

ELECTRIC STARTING SYSTEM
9-10
EAS2GC1363TROUBLESHOOTING
The starter motor fails to turn.
TIP
Before troubleshooting, remove the following part (s):
1. Seat
2. Side cover (left/right)
3. Air scoop (left/right)
4. Fuel tank
5. Air filter case cover1. Check the fuse. Refer to “CHECKING THE FUSES”
on page 9-68. NG

Replace the fuse(s).
OK 
2. Check the battery. Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 9-69. NG

• Clean the battery terminals.
• Recharge or replace the battery.
OK 
3. Check the starter motor operation. Refer to “CHECKING THE START-
ER MOTOR OPERATION” on page
9-75. OK

Starter motor is OK. Perform the electric
starting system troubleshooting, starting
with step 5.
NG 
4. Check the starter motor. Refer to “CHECKING THE START-
ER MOTOR” on page 6-38. NG

Repair or replace the starter motor.
OK 
5. Check the relay unit (Starting circuit cut-off relay).
Refer to “CHECKING THE RE-
LAYS” on page 9-72. NG

Replace the relay unit.
OK 
6. Check the diode. Refer to “CHECKING THE DIODE”
on page 9-73. NG

Replace the diode.
OK 
7. Check the starter relay. Refer to “CHECKING THE RE-
LAYS” on page 9-72. NG

Replace the starter relay.
OK 

ELECTRIC STARTING SYSTEM
9-11
8. Check the main relay.Refer to “CHECKING THE RE-
LAYS” on page 9-72. NG

Replace the main relay.
OK 
9. Check the neutral switch. Refer to “CHECKING THE
SWITCHES” on page 9-64. NG

Replace the neutral switch.
OK 
10.Check the clutch switch. Refer to “CHECKING THE
SWITCHES” on page 9-64. NG

Replace the clutch switch.
OK 
11.Check the engine stop switch. Refer to “CHECKING THE
SWITCHES” on page 9-64. NG

Replace the engine stop switch.
OK 
12.Check the start switch. Refer to “CHECKING THE
SWITCHES” on page 9-64. NG

Replace the start switch.
OK 
13.Check the entire starting system’s wiring.
Refer to “CIRCUIT DIAGRAM” on
page 9-6. NG

Properly connect or repair the starting sys-
tem’s wiring.
OK 
Replace the ECU.

CHARGING SYSTEM
9-13
4. AC magneto
5. Rectifier/regulator
9. Battery
10.Frame ground
11.Starter relay
12.Main fuse
50.Negative battery lead

LIGHTING SYSTEM
9-17
1. Joint connector
2. Joint connector
6. Headlight relay
7. Main relay
9. Battery
10.Frame ground
11.Starter relay
12.Main fuse
22.ECU (engine control unit)
30.Joint connector
42.Joint connector
43.Taillight
44.Headlight
47.Multi-function display
48.Frame ground
50.Negative battery lead

LIGHTING SYSTEM
9-18
EAS2GC1367TROUBLESHOOTING
Any of the following fail to light: headlight or meter light.
TIP
Before troubleshooting, remove the following part (s):
1. Seat
2. Side cover (left)
3. Air scoop (left/right)
4. Fuel tank1. Check the each bulbs condition. Refer to “CHECKING THE BULBS
AND BULB SOCKETS” on page 9-
67. NG

Replace the bulb (s).
OK 
2. Check the fuse. Refer to “CHECKING THE FUSES”
on page 9-68. NG

Replace the fuse(s).
OK 
3. Check the battery. Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 9-69. NG

• Clean the battery terminals.
• Recharge or replace the battery.
OK 
4. Check the main relay. Refer to “CHECKING THE RE-
LAYS” on page 9-72. NG

Replace the main relay.
OK 
5. Check the headlight relay. Refer to “CHECKING THE RE-
LAYS” on page 9-72. NG

Replace the headlight relay.
OK 
6. Check the entire lighting system’s wiring.
Refer to “CIRCUIT DIAGRAM” on
page 9-16. NG

Properly connect or repair the lighting sys-
tem’s wiring.
OK 
Replace the ECU, meter assembly, or
taillight.

SIGNALING SYSTEM
9-21
1. Joint connector
2. Joint connector
3. Joint connector
7. Main relay
9. Battery
10.Frame ground
11.Starter relay
12.Main fuse
15.Indicator light
17.Fuel level warning light
18.Resistor
19.Fuel sender
22.ECU (engine control unit)
30.Joint connector
42.Joint connector
46.Speed sensor
47.Multi-function display
48.Frame ground
50.Negative battery lead

SIGNALING SYSTEM
9-22
EAS2GC1369TROUBLESHOOTING
• The speedometer does not operate normally.
• The fuel indicator light does not come on.
TIP
Before troubleshooting, remove the following part (s):
1. Seat
2. Side cover (left/right)
3. Air scoop (left/right)
4. Fuel tank
Check the signaling system
The speedometer fails to operate.
1. Check the fuse.Refer to “CHECKING THE FUSES”
on page 9-68. NG

Replace the fuse(s).
OK 
2. Check the battery. Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 9-69. NG

• Clean the battery terminals.
• Recharge or replace the battery.
OK 
3. Check the main relay. Refer to “CHECKING THE RE-
LAYS” on page 9-72. NG

Replace the main relay.
OK 
4. Check the entire signaling system’s wiring.
Refer to “CIRCUIT DIAGRAM” on
page 9-20. NG

Properly connect or repair the signaling
system’s wiring.
OK 
This circuit is OK.
1. Check the speed sensor. Refer to “CHECKING THE SPEED
SENSOR” on page 9-77. NG

Replace the speed sensor.
OK 
2. Check the entire signaling system’s wiring.
Refer to “CIRCUIT DIAGRAM” on
page 9-20. NG

Properly connect or repair the signaling
system’s wiring.
OK 
Replace the meter assembly.

COOLING SYSTEM
9-25
1. Joint connector
2. Joint connector
3. Joint connector
7. Main relay
9. Battery
10.Frame ground
11.Starter relay
12.Main fuse
22.ECU (engine control unit)
27.Radiator fan motor relay
28.Radiator fan motor fuse
29.Radiator fan motor
30.Joint connector
32.Coolant temperature sensor
48.Frame ground
50.Negative battery lead