Checking The Signaling System - Yamaha XF50W Service Manual

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
V
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
w
€> &
X
• Set the main switch to "ON".
• Push the horn switch.
• Measure the voltage (DC 12 V) of brown at
the horn terminal.
• Is the voltage within specification?
YES
V
NO
*
Replace the left
handlebar switch.
©
-> ground
s. Br P
V L J.
4
NO
The wiring circuit from
the main switch to the
horn connector is faulty
and must be repaired.
Refer to "CIRCUIT DIA-
GRAM".
SIGNALING SYSTEM
3. Horn
• Disconnect the pink connector at the horn
terminal.
• Connect a jumper lead
nal and ground the jumper lead.
• Set the main switch to "ON".
• Push the horn switch.
• Does the horn sound?
T
Br
I
NO
4. Voltage
• Connect the pocket tester (DC 20 V) to the
horn connector at the pink terminal as shown.
Positive tester probe
Negative tester probe
r r
Br P
L J
to)
• Set the main switch to "ON".
• Measure the voltage (DC 12 V) of pink
the horn terminal.
• Is the voltage within specification?
YES
V
Repair or replace
the horn.
8-36
ELEC
© to the horn termi-
-©
YES
V
The horn is OK.
-» pink ©
-> ground
©
X
4
NO
Replace the horn.
+i
© at