2004 YAMAHA YZF-R1SC relay

8-14
1Main switch
4Fuse (main)
6Battery
8Starter relay
9Starter motor
10Starting circuit cut-off relay
11Neutral switch
12Sidestand switch
53Engine stop switch
54Start switch
73Fuse (ignition)
ELECTRIC STARTING SYSTEMELEC
EAS00755
ELECTRIC STARTING SYSTEM
CIRCUIT DIAGRAM
ProCarManuals.com

8-15
ELECTRIC STARTING SYSTEMELEC
EAS00756
STARTING CIRCUIT CUT-OFF SYSTEM
OPERATION
If the engine stop switch is set to “
” and the
main switch is set to “ON” (both switches are
closed), the starter motor can only operate if at
least one of the following conditions 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) and the sidestand is up
(the sidestand switch is closed).
The starting circuit cut-off relay prevents the
starter motor from operating when neither of
these conditions has been met. In this instance,
the starting circuit cut-off relay is open so cur-
rent 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 starter
switch.
WHEN THE TRANSMISSION IS IN
NEUTRAL
WHEN THE SIDESTAND IS UP AND
THE CLUTCH LEVER IS PULLED TO
THE HANDLEBAR
1Battery
2Main fuse
3Main switch
4Ignition fuse
5Engine stop switch
6Starting circuit cut-off relay
7Diode
8Clutch switch
9Sidestand switch
10Neutral switch
11Start switch
12Starter relay
13Starter motor
ProCarManuals.com

8-16
YESNO
3. Starter motor

Connect the positive battery terminal and
starter motor lead with a jumper lead .
Repair or replace the
starter motor.
A wire that is used as a jumper lead
must have at least the same capacity or
more as that of the battery lead, other-
wise the jumper lead may burn.

This check is likely to produce sparks,
therefore make sure nothing flammable
is in the vicinity.

Does the starter motor turn?
WARNING
1
23
EAS00758
YESNO 2. Battery

Check the condition of the battery.
Refer to “CHECKING AND CHARGING
THE BATTERY” in chapter 3.
Minimum open-circuit voltage
12.8 V or more at 20C (68F)

Is the battery OK?

Clean the battery
terminals.

Recharge or re-
place the battery.
EAS00739
ELECTRIC STARTING SYSTEMELEC
NOTE:
YESNO
1. Main and ignition fuses

Check the main and ignition fuses for conti-
nuity.
Refer to “CHECKING THE FUSES” in chap-
ter 3.

Are the main and ignition fuses OK?
Replace the fuse(s).
EAS00757
TROUBLESHOOTING
The starter motor fails to turn.
Check:
1. main and ignition fuses
2. battery
3. starter motor
4. starting circuit cut-off relay
5. starter relay
6. main switch
7. engine stop switch
8. neutral switch
9. sidestand switch
10. clutch switch
11. start switch
12. wiring connections
(of the entire starting system)

Before troubleshooting, remove the following
part(s):
1. seat
2. fuel tank
3. side cowlings
4. throttle body assembly

Troubleshoot with the following special tool(s).
Pocket tester
90890-03112, YU-3112
EAS00738
ProCarManuals.com

8-17
4. Starting circuit cut-off relay

Disconnect the starting circuit cut-off relay
coupler from the wire harness.

Connect the pocket tester (Ω
1) and bat-
tery (12 V) to the starting circuit cut-off relay
coupler as shown.
YESNO
Replace the starting
circuit cut-off relay.
Positive tester probe
blue / white
Negative tester probe
blue / white

Does the starting circuit cut-off relay have
continuity between blue / white and
blue / white ?
1
2
3
4
EAS00759
Positive battery terminal
red / black
Negative battery terminal

black / yellow
EAS00761
5. Starter relay

Disconnect the starter relay coupler from the
coupler.

Connect the pocket tester (Ω
1) and battery
(12 V) to the starter relay coupler as shown.
YESNO
Replace the starter
relay.
Positive battery terminal
blue / white
Negative battery terminal
red / white
Positive tester probe
red
Negative tester probe
black
1
2
3
4

Does the starter relay have continuity be-
tween red and black?
EAS00749
6. Main switch

Check the main switch for continuity.
Refer to “CHECKING THE SWITCHES”.

Is the main switch OK?
YESNO
Replace the main
switch.
EAS00750
7. Engine stop switch

Check the engine stop switch for continuity.
Refer to “CHECKING THE SWITCHES”.

Is the engine stop switch OK?
YESNO
Replace the right
handlebar switch.
EAS00751
8. Neutral switch

Check the neutral switch for continuity.
Refer to “CHECKING THE SWITCHES”.

Is the neutral switch OK?
YESNO
Replace the neutral
switch.
3
4
ELECTRIC STARTING SYSTEMELEC
ProCarManuals.com

8-28
LIGHTING SYSTEMELEC
1Main switch
4Fuse (main)
6Battery
14E.C.U.
46Hi beam indicator light
49Meter light
57Dimmer switch
62Front turn signal/position light (left)
63Front turn signal/position light (right)
66Headlight
67Auxiliary light
68License plate light
69Rear brake light switch
70Tail/brake light
71Headlight relay (on / off)
72Headlight relay (dimmer)
74Fuse (signal)
75Fuse (headlight)
ProCarManuals.com

8-29
YESNO

Clean the battery
terminals.

Recharge or re-
place the battery.
EAS00749
3. Main switch

Check the main switch for continuity.
Refer to “CHECKING THE SWITCHES”.

Is the main switch OK?
YESNO
Replace the main
switch.
EAS00784
YESNO 4. Dimmer switch

Check the dimmer switch for continuity.
Refer to “CHECKING THE SWITCHES”.

Is the dimmer switch OK?
The dimmer switch is
faulty. Replace the
left handlebar switch.
Minimum open-circuit voltage
12.8 V or more at 20C (68F)

Is the battery OK?
LIGHTING SYSTEMELEC
NOTE:
YESNO
1. Main, turn and headlight fuses

Check the main, turn and headlight fuses for
continuity.
Refer to “CHECKING THE FUSES” in chap-
ter 3.

Are the main, turn and headlight fuses OK?
Replace the fuse(s).
2. Battery

Check the condition of the battery.
Refer to “CHECKING AND CHARGING
THE BATTERY” in chapter 3.
EAS00739EAS00781
TROUBLESHOOTING
Any of the following fail to light: headlight,
high beam indicator light, taillight, licence
light or meter light.
Check:
1. main, turn and headlight fuses
2. battery
3. main switch
4. dimmer switch
5. pass switch
6. headlight relay (on / off)
7. headlight relay (dimmer)
8. wiring connections
(of the entire lighting system)

Before troubleshooting, remove the following
part(s):
1. seat
2. fuel tank
3. side cowlings

Troubleshoot with the following special tool(s).
Pocket tester
90890-03112, YU-3112
EAS00738
ProCarManuals.com

8-30

Does the Headlight relay (dimmer) have
continuity between red / yellow and
black / green ?
NOYES
Replace the dimmer
relay. Positive tester probe
red / yellow
Negative tester probe
black / green
1
2
3
4
5. Headlight relay (on / off)

Disconnect the headlight relay (on / off) from
the coupler.

Connect the pocket tester (Ω
1) and bat-
tery (12 V) to the headlight relay (on / off) as
shown.
Positive battery lead
red / yellow
Negative battery lead
yellow / black
EAS00787
YESNO 7. Wiring

Check the entire lighting system’s wiring.
Refer to “CIRCUIT DIAGRAM”.

Is the lighting system’s wiring properly con-
nected and without defects?
Properly connect or
repair the lighting
system’s wiring.
Check the condition
of each of the lighting
system’s circuits.
Refer to “CHECK-
ING THE LIGHTING
SYSTEM”.

Does the headlight relay (dimmer) have
continuity between black / green and
black / yellow ?
Positive tester probe
black / green
Negative tester probe
black / yellow
1
2
3
4
6. Headlight relay (dimmer)

Disconnect the headlight relay (dimmer)
from the coupler.

Connect the pocket tester (Ω
1) and bat-
tery (12 V) to the headlight relay (dimmer) as
shown.
Positive battery lead
black
Negative battery lead
yellow
3
4
3
4
YESNO
Replace the head-
light relay (dimmer).
LIGHTING SYSTEMELEC
ProCarManuals.com

8-35
SIGNALING SYSTEMELEC
1Main switch
4Fuse (main)
6Battery
10Starting circuit cut-off relay
11Neutral switch
13Fuel pump
14E.C.U.
27Speed sensor
38Fuel level warning light
39Oil level warning light
40Neutral indicator light
41Tachometer
42Shift timing indicator light
43Multi function meter
45Coolant temperature indicator light
47Turn signal indicator light (left)
48Turn signal indicator light (light)
55Turn signal relay
58Horn switch
60Turn signal switch
61Horn
62Front turn signal / position light (left)
63Front turn signal / position light (right)
64Rear turn signal light (left)
65Rear turn signal light (right)
73Fuse (ignition)
74Fuse (signal)
ProCarManuals.com