2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 466Get this manual
Lighting Systems:
Dimmer Switch Inspection
Inspect the dimmer switch in the following procedures: 1) Disconnect the headlight coupler (1)Refer to "Headlight Bulb Replacement (Page 9B-2)"2) Disconnect the handlebar switch coupler (2)2 1
B933H29206008
3) Inspect the dimmer switch for continuity with testerIf any abnormality is found, replace the handlebar switch assembly with new oneRefer to "Handlebars Removal and Installation in Section 6B (Page 6B-3)"Special tool0990025008 (Multi-circuit tester set) Tester knob indication Continuity)