Yamaha PZ50W Service Manual page 339

PASSENGER GRIP WARMER DOES NOT OPERATE. (PZ50VT)
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 engine stop switch and main switch.
Refer to "IGNITION SYSTEM".
NO CONTINUITY
OK
Check the passenger grip warmer.
NO CONTINUITY
OK
Check the passenger grip warmer switch.
NO CONTINUITY
OK
Check the passenger grip warmer relay.
FAULTY
OK
Check the load control relay.
Refer to "LIGHTING SYSTEM".
FAULTY
OK
Check the grip warmer system's wiring.
Refer to "CIRCUIT DIAGRAM".
FAULTY
OK
Correct the connection and/or replace the rectifier/
regulator and/or ECU.
GRIP WARMER 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 right handlebar switch and/or main
switch.
Replace the passenger grip warmer.
Replace the passenger grip warmer switch.
Replace the passenger grip warmer relay.
Replace the load control relay.
Properly connect or repair the grip warmer sys-
tem's wiring.
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