Yamaha VMX12 2001, 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
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.
2. Voltage
• Connect the pocket tester (DC 20 V) to the
horn connector at the horn terminal as
shown.
Positive tester probe
→
brown
1
Negative tester probe
→
ground
• Set the main switch to “ON”.
• Measure the voltage (12 V) of brown at the
horn terminal.
• Is the voltage within specification?
The wiring circuit
from the main switch
to the horn connector
is faulty and must be
repaired.
3. Horn
• Disconnect the pink connector at the horn
terminal.
• Connect a jumper lead
1
to the horn termi-
nal and ground the jumper lead.
• Set the main switch to “ON”.
• Does the horn sound?
The horn is OK.
4. Voltage
• Connect the pocket tester (DC 20 V) to the
horn connector at the pink terminal as
shown.
Positive tester probe
→
pink
1
Negative tester probe
→
ground
• Set the main switch to “ON”.
• Measure the voltage (12 V) of pink
1
at the
horn terminal.
• Is the voltage within specification?
Repair or replace the
horn. Replace the horn.