Yamaha YZF-R1S Service Manual - Elec
8-30
S Does the Headlight relay (dimmer) have
continuity between red / yellow
and
black / green ?
NO
YES
Replace the dimmer
relay.
Positive tester probe
! red/yellow
Negative tester probe
! black/green
1
2
3
4
5. Headlight relay (on / off)
S Disconnect the headlight relay (on/off) from
the coupler.
S 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
YES
NO
7. Wiring
S Check the entire lighting system’s wiring.
Refer to “CIRCUIT DIAGRAM”.
S 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”.
S 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)
S Disconnect the headlight relay (dimmer)
from the coupler.
S 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
YES
NO
Replace the head-
light relay (dimmer).
LIGHTING SYSTEM