Yamaha BT1100 2002 Service Manual page 330

EAS00796
CHECKING THE SIGNALING SYSTEM
1. The horn fails to sound.
1. Horn switch
• Check the horn switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the horn switch OK?
YES
2. Voltage
• Connect the pocket tester (DC 20 V) to the
horn connector at the horn terminal as
shown.
Tester positive probe
Tester negative probe
• Set the main switch to "ON".
• Measure the voltage (12 V) of Brown at the
horn terminal.
• Is the voltage within specification?
YES
NO
Replace the left han-
dlebar switch.
Brown 1
Ground
NO
The wiring circuit
from the main switch
to the horn connector
is faulty and must be
repaired.
SIGNALING SYSTEM
3. Horn
• Disconnect the Black 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?
NO
4. Voltage
• Connect the pocket tester (DC 20 V) to the
horn connecter at the black terminal as
shown.
Tester positive probe
Tester negative probe
• Set the main switch to "ON".
• Measure the voltage (12 V) of Black 1 at the
horn terminal.
• Is the voltage within specification?
YES
Repair or replace the
horn.
7-36
ELEC
YES
The horn is OK.
Black 1
Ground
NO
Replace the horn.