Signal System Check - Yamaha MBK YQ100 Service Manual

SIGNAL SYSTEM CHECK

1. Horn does not sound.
1."HORN" switch
Refer to "SWITCH INSPECTION".
2.Voltage
• Connect the pocket tester (DV20 V ) to the
horn lead.
Pocket tester (+) lead → → → → → Brown
Pocket tester (-) lead → → → → → Ground
• Turn the main switch to "ON".
• Check for voltage (12 V) between "Brown"
and the ground.
3.Horn
• Disconnect the "Pink" lead at the horn ter-
minal.
• Ground the horn terminal with a jumper lead.
• Set the main switch to "ON".
4.Horn
• Connect the pocket tester (DC20 V) to the
horn lead.
Pocket tester (+) lead → → → → → Pink
Pocket tester (-) lead → → → → → Ground
• Turn the main switch to "ON".
• Press the "HORN" switch.
• Check the voltage (12V) between "Pink"
and ground.
Adjust Horn.
CONTINUITY
MEETS
SPECIFICATION
HORN DOES
NOT SOUND
MEETS
SPECIFICATON
7-31
SIGNAL SYSTEM
NO CONTINUITY
Replace the horn switch.
OUT OF SPECIFICATION
Defect in the wire harness between the main
switch and the horn → Repair.
HORN SOUNDS
Horn is in good condition.
Br P
NO CONTINUITY
Replace Horn.
ELEC
Br P