Yamaha YZF-R1P Utility Trailer User Manual


 
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ELEC
SIGNALING SYSTEM
EAS00797
2. The tail/brake light fails to come on.
2. Voltage
Connect the pocket tester (DC 20 V) to the
horn connector at the horn terminal as shown.
Positive tester probe
pink
1
Negative tester probe
ground
Set the main switch to ON.
Push the horn switch.
Measure the voltage (DC 12 V) of pink at
the horn terminal.
Is the voltage within specification?
YES
NO
The wiring circuit from
the main switch to the
horn connector is faulty
and must be repaired.
3. Horn
Disconnect the black connector at the horn
terminal.
Connect a jumper lead
1
to the horn ter-
minal and ground the jumper lead.
Set the main switch to ON.
Push the horn switch.
Does the horn sound?
NO
YES
Replace the horn. The horn is OK.
1. Tail/brake light bulb and socket
Check the tail/brake light bulb and socket
for continuity.
Refer to CHECKING THE BULBS AND
BULB SOCKETS
Are the tail/brake light bulb and socket OK?
YES
NO
Replace the tail/
brake light bulb,
socket or both.
2. Brake light switches
Check the brake light switches for continuity.
Refer to CHECKING THE SWITCHES.
Is the brake light switch OK?
YES
NO
Replace the brake
light switch.
3. Voltage
Connect the pocket tester (DC 20 V) to the
tail/brake light coupler (wire harness side)
as shown.
Positive tester probe
yellow
1
Negative tester probe
black
2
Set the main switch to ON.
Pull in the brake lever or push down on the
brake pedal.
Measure the voltage (DC 12 V) of yellow
1
on the tail/brake light coupler (wire har-
ness side).
Is the voltage within specification?