Yamaha RS90K Manuel D'atelier page 681

BACK BUZZER DOES NOT SOUND. (RS90R/RSG90/RST90/RST90TF)
Check the main fuse, ignition fuse, and signal fuse.
Refer to "FUSE INSPECTION" in CHAPTER 2.
FAULTY
OK
Check the battery.
Refer to "BATTERY INSPECTION" in CHAPTER 2.
OUT OF SPECIFICATION
OK
Check the stator coil.
Refer to "CHARGING SYSTEM".
OUT OF SPECIFICATION
OK
Check the main switch.
Refer to "IGNITION SYSTEM".
FAULTY
OK
Check the gear position switch.
FAULTY
OK
Check the load control relay.
Refer to "IGNITION SYSTEM".
FAULTY
OK
Check the DC back buzzer.
DOES NOT SOUND
OK
Check the signal system's wiring.
Refer to "CIRCUIT DIAGRAM".
FAULTY
OK
Correct the connection and/or replace the rectifier/
regulator and/or ignitor unit.
SIGNAL SYSTEM
Replace the main fuse, ignition fuse, and/or signal
fuse.
Replace and/or charge the battery.
Refer to "BATTERY INSPECTION" in CHAPTER
2.
Replace the stator coil assembly.
Replace the main switch.
Replace the gear position switch.
Replace the load control relay.
Replace the DC back buzzer.
Properly connect or repair the signal system's wir-
ing.
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ELEC