Zero chance for a VSC off switch.
You can however add an AC inverter. If I had to guess the other is for the RSCA off. If you take pics of the clips it might be more help.
2006 SR5 4runner
Found these 2 harness ends behind the blank panel controls. Any chance one could be for a VSC OFF switch ?
found this online, I'll check mine later but I think it looks the same...