Yamaha RS90GTZ Service Manual page 426

PASSENGER GRIP WARMER DOES NOT OPERATE. (RST90GTZ)
Check the main fuse, ignition fuse, and signal fuse.
Refer to "FUSE INSPECTION" in CHAPTER 2.
OK FAULTY
Check the battery.
Refer to "BATTERY INSPECTION" in CHAPTER 2.
OK OUT OF SPECIFICATION
Check the engine stop switch and main switch.
Refer to "IGNITION SYSTEM".
OK NO CONTINUITY
Check the passenger grip warmers.
OK NO CONTINUITY
Check the passenger grip warmer switch.
OK NO CONTINUITY
Check the passenger grip warmer relay.
OK FAULTY
Check the load control relay.
Refer to "LIGHTING SYSTEM".
OK FAULTY
Check the grip warmer system wiring.
Refer to "CIRCUIT DIAGRAM".
OK FAULTY
Correct the connection and/or replace the ECU.
GRIP WARMER SYSTEM
Replace the main fuse, ignition fuse, and/or
signal fuse.
Replace or charge the battery.
Refer to "BATTERY INSPECTION" in CHAP-
TER 2.
Replace the right handlebar switch and/or
main switch.
Replace the passenger grip warmer(s).
Replace the passenger grip warmer switch.
Replace the passenger grip warmer relay.
Replace the load control relay.
Properly connect or repair the grip warmer
system wiring.
8-60
ELEC