Yamaha XV16AL, Service Manual

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ELEC
SIGNALING SYSTEM
EB806410
CHECKING THE SIGNALING SYSTEM
1.The horn fails to sound.
YES
NO
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.
YES
NO
2.Voltage
• Connect the pocket tester (DC 20 V) to
the horn coupler as shown.
Tester positive probe
→
brown
1
Tester negative probe
→
ground
• Set the main switch to “ON”.
• Push the horn switch.
• Measure the voltage (12 V) of brown on
the horn coupler.
• Is the voltage within specification?
The wiring circuit
from the main
switch to the horn
connector is faulty
and must be
repaired.
NO
YES
3.Horn
• Disconnect the horn coupler at the horn.
• Connect a jumper lead
1
to the brown
terminal in the horn coupler and the
horn terminal.
• Connect a jumper lead
2
to the horn ter-
minal and ground the jumper lead.
• Set the main switch to “ON”.
• Push the horn switch.
• Does the horn sound?
The horn is OK.
YES NO
4.Voltage
• Connect the pocket tester (DC 20 V) to
the horn coupler as shown.
Tester positive probe
→
pink
1
Tester negative probe
→
ground
• Set the main switch to “ON”.
• Measure the voltage (12 V) of pink
1
on
the horn coupler.
• Is the voltage within specification?
Repair or replace
the horn. Replace the horn.
7