Yamaha FX Nytro 2008 Manuel D'atelier page 744

TROUBLESHOOTING
GRIP WARMER AND THUMB WARMER DO NOT OPERATE.
Check the main fuse and ignition 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 engine stop switch and main switch.
Refer to "IGNITION SYSTEM".
NO CONTINUITY
OK
Check the grip warmer and thumb warmer.
NO CONTINUITY
OK
Check the grip/thumb warmer adjustment switch.
NO CONTINUITY
CORRECT
Check the grip warmer system wiring.
Refer to "CIRCUIT DIAGRAM".
FAULTY
OK
Correct the connection and/or replace the
speedometer unit and/or ECU.
GRIP WARMER SYSTEM
Replace the main fuse and/or ignition fuse.
Replace or charge the battery.
Refer to "BATTERY INSPECTION" in CHAPTER
2.
Replace the right handlebar switch and/or main
switch.
Replace the grip warmer and/or thumb warmer.
Replace the left handlebar switch.
Properly connect or repair the grip warmer system
wiring.
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ELEC