Checking The Signaling System - Yamaha T135SE Service Manual

EAS00796

CHECKING THE SIGNALING SYSTEM

1. The horn fails to sound.
1. Horn switch
9 Check the horn switch for continuity.
Refer to "CHECKING THE SWITCHES".
9 Is the horn switch OK?
YES
2. Voltage
9 Connect the pocket tester (DC 20 V) to the
horn connector at the horn terminal as
shown.
→→
Positive tester probe
Negative tester probe
Br
1
9 Set the main switch to "ON".
9 Measure the voltage (DC 12 V) of brown
lead terminal at the horn terminal.
9 Is the voltage within specification?
YES
NO
Replace the left han-
dlebar switch.
11
brown
→→
ground
P
NO
The wiring circuit
from the main switch
to the horn connec-
tor is faulty and must
be repaired.
8-33
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SIGNALING SYSTEM
3. Horn
9 Disconnect the pink connector at the horn
terminal.
9 Connect a jumper lead 1 to the horn termi-
nal and ground the jumper lead.
9 Set the main switch to "ON".
9 Does the horn sound?
Br
NO
4. Voltage
9 Connect the pocket tester (DC 20 V) to the
horn connector at the pink terminal as
shown.
Positive tester probe
Negative tester probe
Br
9 Set the main switch to "ON".
9 Measure the voltage (DC 12 V) of pink lead
terminal 1 at the horn terminal.
9 Is the voltage within specification?
YES
Repair or replace
the horn.
ELEC
1
YES
The horn is OK.
→→
11
pink
→→
ground
P
1
NO
Replace the horn.