Yamaha 2002 YB50, Service Manual

Page: 149 / 161

ELEC
SIGNALLING SYSTEM
7-19
4. Connections
• Check the connections throughout the sig-
nalling system.
• See the “ELECTRICAL DIAGRAM”section
Check the conditions for each signalling sys-
tem circuit.
Consult the “CHECKING SIGNALLING SYS-
TEM” section.
CHECKING SIGNALLING SYSTEM
1. Horn does not operate
1.“HORN” switch.
• Disconnect the coupler of the handlebar
switch (left) from the installation and horn
cable.
• Check the switch component for continuity
between “Black and Red ”.
2. Voltage
• Connect the pocket tester (20 V DC) on the
horn cable.
Cable (+) of the tester Brown
Cable (–) of tester Frame earth
• Place the main switch on “ON”
• Check if there is a voltage (12 V) in the
brown cable of the horn terminal.
SATISFIES
THE SPECIFIED
VALUE (12 V)
CORRECT
CORRECT
BAD CONNECTION
Repair
INCORRECT
The “HORN” switch is defective, change the
handlebar switch (left).
OUTSIDE SPECIFIED VALUE
The connection circuit from the main switch
to the horn terminal is defective, repair.