Yamaha XP500, Service Manual

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ELEC
SIGNALING SYSTEM
EAS00796
CHECKING THE SIGNALING SYSTEM
1. The horn fails to sound.
YES
NO
YES
NO
NO
YES
1. Horn switch
• Check the horn switch for continuity.
Refer to “CHECKING THE SWITCHES”.
• Is the horn switch OK?
Replace the left han-
dlebar switch.
2. Voltage
• Connect the pocket tester (DC 20 V) to the
horn coupler as shown.
Positive tester probe
→
brown
1
Negative tester probe
→
ground
• Set the main switch to “ON”.
• Measure the voltage (DC 12 V) of brown at
the horn coupler.
• Is the voltage within specification?
The wiring circuit
from the main switch
to the horn coupler is
faulty and must be
repaired.
3. Horn
• Disconnect the horn coupler at the horn.
• Connect a jumper lead
1
to the brown ter-
minal in the horn coupler and the horn ter-
minal.
• Connect a jumper lead
2
to the horn ter-
minal and ground.
• Set the main switch to “ON”.
• Does the horn sound?
The wiring circuit
from the horn coupler
to the horn switch
coupler and/or horn
switch to ground are
faulty and must be
repaired. The horn is OK.