When my buddy bought his FJ new it too came with it. It is a dealer installed alarm sensor. The dealer added it to almost all vehicles regardless if you paid for it. They they tried to sell u the aftermarket alarm and would activate it.
Now we know where to get spare parts.They wanted $500 to activate this thing. I declined with the intent of going aftermarket but I never did.
Now we know where to get spare parts.
Op wants to know what that deal is above and to the right of the tpms reset button.Tire Pressure warning reset switch View attachment 9635