2007 Yamaha Apex Factory Service Manual, Page 283Get this manual

2007 Yamaha Apex Factory Service Manual, Page 283

GRIP WARMER SYSTEM GRIP WARMER SWITCH 1Disconnect: Grip warmer switch coupler 2Connect: Pocket tester (to the switch coupler)
3Inspect: Grip warmer switch continuity Switch is operatedFaultyReplace the handlebar switch (left)Grip warmer switch position