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I think that is for a brake fluid low level sensor connection. My FJ80 m/c has that plug as well. I've heard that sensor can act up off road on side hills where the fluid sloshes away from the sensor. Not sure if it is just an idiot light or what that is connected to it.



Roger, it sounds like you haven't gotten yours hooked up yet either.

'89 4runner SR5, 3.0, auto (fun)
'93 xtra cab, dlx,3.0, 5spd (work truck)