2010-2011 Yamaha RS Vector / RS Venture Service Manual, Page 424Get this manual
GRIP WARMER SYSTEM TROUBLESHOOTING
GRIP WARMER AND THUMB WARMER DO NOT OPERATECheck the main fuse and ignition fuseRefer to "FUSE INSPECTION" in CHAPTER 2OK FAULTY Replace the main fuse andor ignition fuse
Check the batteryRefer to "BATTERY INSPECTION" in CHAPTER 2OK OUT OF SPECIFICATION Replace or charge the batteryRefer to "BATTERY INSPECTION" in CHAPTER 2