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Mk3 Focus Windscreen Sensor...?

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#1 Loz Cheung

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Posted 15 December 2012 - 02:53 PM

Hi everyone,

Never really figured out what the sensor behind my rear view mirror is on my windscreen.

I dont have auto wipers/lights and the only thing I can locate it too is either the 'Active city stop' or Auto high beam' according to the manual.

Thing is, i cant find these settings on the info/trip computer though...? :huh:

Anyone know what it might be for?

Cheers :)

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#2 Stoney871

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Posted 15 December 2012 - 04:02 PM

Search the web for ford etis and enter your registration or vin where asked.
That will bring up your build data and hopefully help identify the sensor.
Btw, do you have standard air conditioning or climate control? Maybe it's a sensor for climate control?
On the Mk2 focus, ones with climate control have a sensor on the dash which help to balance inside temperature with outside conditions.

#3 martyntdci

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Posted 15 December 2012 - 04:16 PM

could it be sensor for the central locking? unsure about the focus but that where it was on my mk3 cav

#4 Preee

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Posted 15 December 2012 - 08:00 PM

I have three sensors on mine , large one is Radar for City Stop and ACC , two smaller ones are rain and lights.

The one on yours could be an extra that they did not wire in perhaps. take a closer look at it see if its one or two sensors , if its two then maybe you can buy a switch and get auto lights working.

the climate sensor is only there if you have climate control

#5 Loz Cheung

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Posted 17 December 2012 - 07:26 PM

I did have a look on Etis but couldnt spot anything as such, i might post it on here to see if any one is more eagle eyed than i am!

I'll have a closer look for any possible sensors hidden in the blackness, I have standard air con so can cross that off the list :) and i havent noticed them on any other focus's apart from the Titanium upwards!

But yes, it could very well not be wired in, are the covers easy to take off?

#6 Preee

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Posted 17 December 2012 - 10:07 PM

But yes, it could very well not be wired in, are the covers easy to take off?

TBH not tried to get the covers off but i would imagine they will just unclip , then you will be able to see if the sensor is wired there are a couple of over people with Zetec's so i wonder if they have a sensor on the screen as well.

#7 jimrex

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Posted 20 December 2012 - 01:16 PM

My car is a Zetec, do you mean these black tabs?...

https://fbcdn-photos...881486805_n.jpg

I assumed they were either ariels for DAB or light sensors (you'll notice the brightness of the stereo screen changes depending on how dark it is, and ambient lighting comes on when it gets dark)

Just a thought :)

#8 Loz Cheung

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Posted 21 December 2012 - 08:29 PM

ahhh not not quite! it extends further down behind the rear view mirror :)

i'll get a pic this weekend as well as having a go dismantling it :)

#9 Preee

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Posted 21 December 2012 - 11:56 PM

I'll take a picture of mine too compare them then

#10 Biggame

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Posted 26 December 2012 - 09:30 AM

Hi everyone,

Never really figured out what the sensor behind my rear view mirror is on my windscreen.

I dont have auto wipers/lights and the only thing I can locate it too is either the 'Active city stop' or Auto high beam' according to the manual.

Thing is, i cant find these settings on the info/trip computer though...? :huh:

Anyone know what it might be for?

Cheers :)

There's a lot of sensors behind the rear view mirror. My Focus has Lane keeper and a sensor for it (scanning the lane separator line i the middle of the road + on the road shoulder, Active City Stop, and camera that reads traffic signs. Have had a couple of error messages due to dirt on the sensors/cameras. This was solved by a single wiper sweep. The answer to your questions could be multiple, also adding the option that your car is equipped with a sensor pack in the window suited for cars with higher specs and some functions are not available on your car.
Regards from Norway

#11 Biggame

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Posted 26 December 2012 - 09:35 AM

My car is a Zetec, do you mean these black tabs?...

https://fbcdn-photos...881486805_n.jpg

I assumed they were either ariels for DAB or light sensors (you'll notice the brightness of the stereo screen changes depending on how dark it is, and ambient lighting comes on when it gets dark)

Just a thought :)

Pardon, but the to black boxes seems aftermarket style . My DAB antenna is mounted on the roof (30 cm'ish whip type) and alle of the sensor are grouped in a console and not visible on by one

#12 Loz Cheung

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Posted 26 December 2012 - 06:23 PM

Heres the pic i took of it today.
Theres a 2 part cover that meet in the middle : The top part between the roof and mirror front - unclips if you pull downwards.

Then the larger part (that extends down) thats clips to the mirror mount at the back of the mirror itself that just pulls straight vertically down.

There seems to be something wired in, but not sure!

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  • IMG-20121226-00091.jpg


#13 Preee

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Posted 26 December 2012 - 10:04 PM

How many lens can you see from the out side?

#14 Stoney871

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Posted 26 December 2012 - 10:09 PM

That to me looks like an auto dimming mirror.

#15 Preee

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Posted 26 December 2012 - 10:29 PM

That to me looks like an auto dimming mirror.

Auto dimming mirror has a small round sensor on the glass side to detect the lights.

That sensor has got to be rain and light sensor , but with out the switches fitted to the car.

if the front shows two sensors then they are rain/light sensors and the only other sensor you get on the Mk3 focus is the front radar which sit just under that sensor box in the picture.

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