What's this little black box?

I think it's the windshield wiper sensor. (I could be wrong.)

 

If you're signed into TIS, you ought to be able to find it in the Electrical Wiring Diagram viewer, if you start in the location and routing section. You'll see little drawings of the cabin, with letter-numbered callouts pointing to things in different positions. If you click the right callout and hit the Info icon, you can be taken straight to the circuit that includes it, and find out what it's there for.

One trick with those location drawings is they might be split into several pages, just because of the number of things needing to be called out. Each page shows the same drawing and all the same items, but only some of them are called out on each page; you just keep switching pages until you find a callout pointing to the thing you're wondering about.

-Chap

 

I'm pretty sure there's a thread here, someone wired up a dash cam getting power from those wires in the rear view mirror. Likely 3rd gen, but I'd suspect it's similar. I looked a bit, got couldn't find it, so fwiw.

 

max,

I believe it houses the lane departure warning, where camera/sensor sees lane makings, and gives you a beep and pulls steering a little towards the opposite direction you car is drifting to.
I have a 4 with this feature. Not sure if your car has this.
It even beeps/pulls steering back if I change lanes without signaling.

Read you manual if yours has this feature.
Be aware that touch electrical things, may cause other problems, and void
your warrantee.

stt

 

That's the rain sensor.

 

There is no rain sensor on his Two model. I asked that same question a few months ago. My Three has the box.

 

sensor for the blinker fluid level?
you never want to run out of blinker fluid.

 

I think somebody told me that black box up there by the mirror, has something to do with the climate control/humidity.

I don't have the Advanced Tech Package, or rain sensors, etc. Maybe it's just an empty box?

 

Just a shot in the dark, but could it be the camera for pedestrian detection?????

 

For cars so equipped.

stt

 

Thanks stt

 

The OP has a Two model,which I believe doesn't have any advanced tech features.

 

You could disconnect it and see what happens.

 

Great idea, Oddjob.

Mine in a skinny box, about 4 inches long? People with the ATP have a bigger/wider box up there, I think.
As long as I keep getting 64 mpg, I don't care what it is!! (But it might be nice to have a factory-installed dash cam up there. Toyota should offer it.)

 

Your photo shows 2 wires coming out - was there a cover over the wires - it doesn't look like a factory installed item.

 

You know, Toyota does tend to stamp a part number nnnnn-nnnnn on pretty much every odd little electronic part. If you dismount the little thing and look closely you may well find the number, which you can then often google.

-Chap

 

It's a humidity sensor used by A/C unit.