Yamaha 2002 CS50, Service Manual, Page: 188 / 204

ELEC
SIGNALING SYSTEM
8-29
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?
2. Voltage
• Connect the pocket tester (DC 20 V) to the
horn connector at the horn terminal as
shown.
Positive tester probe brown
Negative tester probe ground
• Set the main switch to “ON”.
• Measure the voltage (DC 12 V) of brown at
the horn terminal.
• Is the voltage within specification?
3. Horn
• Disconnect the pink connector at the horn
terminal.
• Connect a jumper lead to the horn terminal
and ground the jumper lead.
• Set the main switch to “ON”.
• Does the horn sound?
4. Voltage
• Disconnect the pink and brown connectors
at the horn terminal.
• Connect the pocket tester (DC 20 V) to the
horn connectors as shown.
Positive tester probe brown
Negative tester probe pink
• Set the main switch to “ON”. Push horn
switch
• Measure the voltage (DC 12 V) of pink at
the horn terminal.
• Is the voltage within specification?
Replace the left
handlebar switch.
Br
P
-
+
The wiring circuit
from the main
switch to the horn
connector is faulty
and must be
repaired.
Replace the horn.
Br
P
-
+
The wiring circuit or
horn switch is faulty
and must be repai-
red.
This circuit is OK.
YES
NO
YES
NO
YES
NO
YES
NO