Yamaha YFM45FAR Service Manual page 382

4.Horn does not sound. (for Europe and
Oceania)
1.Horn switch
Refer to "CHECKING THE SWITCH".
2.Voltage
Connect the pocket tester (DC 20 V) to the
G
horn connector at the horn terminal.
Tester (+) lead → Pink lead 1
Tester (–) lead → Frame ground
Turn the main switch to "ON".
G
Push the horn switch.
G
Check for voltage (12 V) on the "Pink" lead
G
at the horn terminal.
3.Horn
Disconnect the black lead at the horn
G
terminal.
Connect a jumper lead 1 to the horn
G
terminal and ground the jumper lead.
Turn the main switch to "ON".
G
Push the horn switch.
G
Adjust or replace horn.
CORRECT
MEETS
SPECIFICATION
HORN IS NOT
SOUNDED
9 - 37
SIGNAL SYSTEM
INCORRECT
Replace horn switch.
OUT OF SPECIFICATION
The wiring circuit from the main switch to the
bulb socket connector is faulty, repair it.
HORN IS SOUNDED
Horn is good.
– +
ELEC