Auto Headlight Sensor - Mazda3 Forums : The #1 Mazda 3 Forum


FMVPerformance.com is the premier Mazda 3 Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools
Old 05-12-2011, 02:01 PM   #1
tokage
Moped Rider
 
Join Date: Mar 2007
Location: San Jose, CA
Posts: 24
Send a message via ICQ to tokage Send a message via AIM to tokage Send a message via MSN to tokage Send a message via Yahoo to tokage
Default Auto Headlight Sensor

I had the windshield changed out on my 2007 MS3 the other day, and since then, I've noticed that when I have the headlights in AUTO mode, they don't turn off during the day the way they used to. I'm thinking there might be something blocking whatever sensor it uses to determine how bright it is outside, but I haven't been able to find it. Does anyone know where the light sensor is that controls the headlights?

Thanks,
toki
tokage is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 05-13-2011, 08:13 PM   #2
ForestGrump
Short Track Racer
 
Join Date: Jun 2008
Location: SF Bay Area
Posts: 248
Default Re: Auto Headlight Sensor

The light sensor is on top of the windshield in the middle. The mirror mounts to the windshild where the sensor is. Check there is nothing blocking the sensor. Maybe the sensor is unplugged? hell you're in SJ. give me a call. I'll PM you my number
__________________
01 Honda Insight 26k mi -- Rear ended by Ford Exploder
03 6i MTX 96.6k mi -- SOLD!
09 speed3 GT 78kmi
ForestGrump is offline   Reply With Quote
Old 06-25-2011, 06:18 PM   #3
Farnsworth
Guest
 
Posts: n/a
Default Re: Auto Headlight Sensor

tokage, I just had my windshield replaced, too, and am having the same problems. The glass co. even replaced the sensor pack, which didnt help. They insist I have the right windshield, one for auto wipers and headlights. Did you ever resolve this?
  Reply With Quote
Old 06-25-2011, 06:20 PM   #4
Farnsworth
Guest
 
Posts: n/a
Default Re: Auto Headlight Sensor

BTW this is the only other info I can find on this problem.

http://www.torontomazda3.ca/forum/sh...sors-dont-work
  Reply With Quote
Old 06-27-2011, 03:34 AM   #5
tokage
Moped Rider
 
Join Date: Mar 2007
Location: San Jose, CA
Posts: 24
Send a message via ICQ to tokage Send a message via AIM to tokage Send a message via MSN to tokage Send a message via Yahoo to tokage
Default Re: Auto Headlight Sensor

As others have mentioned, the light sensor that controls the auto headlights is in the rain sensor, behind the mirror. I thought mine maybe had something blocking the sensor, so I tried removing it and cleaning it off, and also cleaning the windshield glass on the opposite side of the sensor. It didn't help.

I ended up finding a copy of the tech manual online, and in it was written a note about how the sensor unit calibrates itself the first time power is applied. I tried unplugging the connector directly from the sensor, but that didn't seem to do the trick, so I disconnected the battery momentarily and this seemed to at least improve the way it's been working. It's still not perfect, but better than before.

If you try this, just remember to write down all of your radio settings and anything you might have in the nav system (if you have one), as it will go back to its defaults when the battery is disconnected.

One last piece of advice I will give is this: when trying to remove the interior cover on the rain sensor, DO NOT pull it forcefully as it will snap off the cheap plastic hooks that hold the sensor to the windshield. I've had this happen to me twice -- once when someone from the dealer was fucking around inside the cab, and once due to my own dumb luck (caught my backpack on it mistakenly) -- so mine is now reaffixed to the windshield with a bead of high-temperature caulk around the edge of the sensor.

tokage is offline   Reply With Quote
Old 06-29-2011, 01:57 PM   #6
Farnsworth
Guest
 
Posts: n/a
Default Re: Auto Headlight Sensor

Good find. On that power-on calibration, should the sensor be in light or darkness? Are we calibrating the brightness needed for headlights off or on?
  Reply With Quote
Old 06-29-2011, 03:37 PM   #7
tokage
Moped Rider
 
Join Date: Mar 2007
Location: San Jose, CA
Posts: 24
Send a message via ICQ to tokage Send a message via AIM to tokage Send a message via MSN to tokage Send a message via Yahoo to tokage
Default Re: Auto Headlight Sensor

I went back and re-read the manual, and actually, the note was about the sensor calibrating itself for raindrops/dirt on the windshield, not for the ambient light level.

There does seem to be an "Auto Light Illumination Level Setting" that can be adjusted in the ECU, but it looks like you need one of the factory module programmers to change the setting. Not much you can do aside from ask the dealer to do it, I guess.

Sorry for the false alarm.
tokage is offline   Reply With Quote
Old 10-24-2012, 05:01 PM   #8
siarheicka
Bicycle Rider
 
Join Date: Aug 2011
Location: California
Posts: 9
Default

I went to the dealership and had the auto-on threshold adjusted to lower level.
That seemed to do the trick.
siarheicka is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Mazda3 Forums : The #1 Mazda 3 Forum > Technical / Model / Performance > MazdaSpeed > MazdaSpeed3 Stock Issues

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -4. The time now is 02:58 AM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.