2007 Yamaha Apex Factory Service Manual, Page 282Get this manual

2007 Yamaha Apex Factory Service Manual, Page 282

GRIP WARMER SYSTEM GRIP AND THUMB WARMER COIL 1Disconnect: Grip warmer leads Thumb warmer coupler 2Connect: Pocket tester
continuityReplace both grips together or separately andor the handlebar switch THUMB WARMER SWITCH 1Disconnect: Thumb warmer
switch coupler 2Connect: Pocket tester (to the switch coupler) 3.Inspect: Thumb warmer switch continuity Switch is operatedFaultyReplace