Yamaha Yzf R1 2007 Manual

ELECTRICAL COMPONENTS
8-82
1. Main switch
2. Horn switch
3. Dimmer switch
4. Turn signal switch
5. Clutch switch
6. Sidestand switch
7. Engine stop switch
8. Front brake light switch
9. Start switch
10.Oil level switch
11.Neutral switch
12.Rear brake light switch 

ELECTRICAL COMPONENTS
8-83
Check each switch for continuity with the pocket tester. If the continuity reading is incorrect, check 
the wiring connections and if necessary, replace the switch.
CAUTION:
ECA14370
Never insert the tester probes into the coupler terminal slots “a”. Always insert the probes 
from the opposite end of the coupler, taking care not to loosen or damage the leads.
NOTE:
 Before checking for continuity, set the pocket tester to “0” and to the “Ω × 1” range.
 When checking for...

ELECTRICAL COMPONENTS
8-84
EAS27990
CHECKING THE BULBS AND BULB SOCK-
ETS
Check each bulb and bulb socket for damage 
or wear, proper connections, and also for conti-
nuity between the terminals.
Damage/wear → Repair or replace the bulb, 
bulb socket or both.
Improperly connected → Properly connect.
No continuity → Repair or replace the bulb, 
bulb socket or both.
Types of bulbs
The bulbs used on this vehicle are shown in 
the illustration.
 Bulbs “a” are used for the headlights and 
usually use a bulb...

ELECTRICAL COMPONENTS
8-85
NOTE:
Check each bulb socket for continuity in the 
same manner as described in the bulb section; 
however, note the following.
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a. Install a good bulb into the bulb socket.
b. Connect the pocket tester probes to the 
respective leads of the bulb socket.
c. Check the bulb socket for continuity. If any 
of the readings indicate no continuity, 
replace the bulb socket.
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EAS28000
CHECKING THE FUSES
The following procedure...

ELECTRICAL COMPONENTS
8-86
 Avoid bodily contact with electrolyte as it 
can cause severe burns or permanent eye 
injury.
FIRST AID IN CASE OF BODILY CONTACT:
EXTERNAL
 Skin — Wash with water.
 Eyes — Flush with water for 15 minutes 
and get immediate medical attention.
INTERNAL
 Drink large quantities of water or milk fol-
lowed with milk of magnesia, beaten egg 
or vegetable oil. Get immediate medical 
attention.
CAUTION:
ECA13660
 This is a sealed battery. Never remove the 
sealing caps because...

ELECTRICAL COMPONENTS
8-87
 Do not use a high-rate battery charger 
since it forces a high-amperage current 
into the battery quickly and can cause 
battery overheating and battery plate 
damage.
 If it is impossible to regulate the charging 
current on the battery charger, be careful 
not to overcharge the battery.
 When charging a battery, be sure to 
remove it from the vehicle. (If charging 
has to be done with the battery mounted 
on the vehicle, disconnect the negative 
battery lead from the...

ELECTRICAL COMPONENTS
8-88
c. Make sure that the current is higher than 
the standard charging current written on 
the battery.
NOTE:
If the current is lower than the standard charg-
ing current written on the battery, This type of 
battery charger cannot charge the MF battery. 
A variable voltage charger is recommended.
d. Charge the battery until the battery’s charg-
ing voltage is 15 V.
NOTE:
Set the charging time at 20 hours (maximum).
e. Measure the battery open-circuit voltage 
after leaving the...

ELECTRICAL COMPONENTS
8-89
Relay unit (fuel pump relay)
Headlight relay (on/off)
Headlight relay (dimmer)Radiator fan motor relay
EAS4C81019
CHECKING THE TURN SIGNAL RELAY
1. Check:
 Turn signal relay input voltage
Out of specification → The wiring circuit 
from the main switch to the turn signal relay 
coupler is faulty and must be repaired.
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a. Connect the pocket tester (DC 20 V) to the 
turn signal relay terminal as shown.
1. Positive battery terminal
2. Negative battery...

ELECTRICAL COMPONENTS
8-90
b. Turn the main switch to “ON”.
c. Measure the turn signal relay input voltage.
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2. Check:
 Turn signal relay output voltage
Out of specification → Replace.
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a. Connect the pocket tester (DC 20 V) to the 
turn signal relay terminal as shown.
b. Turn the main switch to “ON”.
c. Measure the turn signal relay output volt-
age.
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EAS28050
CHECKING THE RELAY UNIT (DIODE)
1. Check:
 Relay unit...

ELECTRICAL COMPONENTS
8-91
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a. Disconnect the relay unit coupler from the 
wire harness.
b. Connect the pocket tester (Ω × 1) to the 
relay unit terminal as shown.
c. Check the relay unit (diode) for continuity.
d. Check the relay unit (diode) for no continu-
ity.
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EAS28100
CHECKING THE IGNITION COILS
The following procedure applies to all of the 
ignition coils.
1. Check:
 Primary coil resistance
Out of specification → Replace....