Its a monitoring box that Toyota puts on every thousand or so cars in order to check the driving habits of people in North America and around the world:ugh3: every maintenance they pull the info out and send it back to Japan:ugh3: ......Also police are thinking about tying into the same box to check for the amount of speeding/reckless/ drunk driving people are doing:yikes: but that's still long off waiting to be put into law, and of coarse blonds will have a special box:naughty: .......~Radd Guy~rrinas said:I have a 2005 Toyota Corolla. I was looking underneath the car tonight, and I noticed a little black box underneath the rear left wheel. What is that??? Just curious!?!?!?!?