none on mine
I have a more or less factory 2002 R-vision Trail Lite 211 Class B+ gas Chevy and there is no switch near there. That switch seems to be on your center console above the bin, not the actual chassis dashboard.
I do have the Emergency Start switch just mentioned right next to a generator start switch and they do not look iike yours, and they are in a location lower and to the left more.
If your light is an LED not a filament type bulb, then those were not available in 2002, I believe, making me think it was an add on by a previous owner.
In your situation, I would look for some after-market device, mostly likely 12 volt, possible removed leaving nothing but some screw holes and the end of the wire, that would need such a non-momentary on-off switch: backup camera or outside lights, fog, spot, decorative (look at night), a light for the bin or a map light, GPS, TPMS, underhood light, fan, electric steps, stereo in back. You could look at the wire and see if it has a label, its color coding and if it is thin or heavy guage, giving your more guidance.
Please let us know what you discover. Good luck!