rear defroster isnt working? - Mazda MX-6 Forum
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post #1 of 23 (permalink) Old 1-25-08, 18:11 Thread Starter
 
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rear defroster isnt working?

Hello peeps. I think my rear window defroster isnt working anymore, cuz when i press the button the light on the dash will come on, but the window isnt defrosted. Any way to check this? or fix it? cuz it sucks to drive the car in winter with all the fog :O


btw.. do all MX6's windows get foggy easily? cuz mine do..

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post #2 of 23 (permalink) Old 1-25-08, 18:23

 
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check for a break or breaks in the grid on the window. i think its wired up in series, dont quote me on that, so if theres a break it wont work.
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post #3 of 23 (permalink) Old 1-25-08, 18:28
 
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yeah i'd just check all the wires for a break...and make sure the two plug things on each side of the rear window have not come off or broken off...this happened to a friend of mine after he had speakers installed at best buy...they broke one of those things off and his defroster would not work.

And yes, MX6s due tend to fog up reather easliy.

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post #4 of 23 (permalink) Old 1-27-08, 11:07

 
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my rear defogger didnt work when i bought the car either. no breaks, it just didnt work.

i brought it into the local shop (before i had put any time into the car, and i knew nothing about it) and had them fix it. Before i brought it in, the factory alarm did not work (and i didnt know there was a factory alarm...), but when they gave me the car back both the factory alarm and the defogger worked again.

so im assuming both the alarm and the fogger are on the same board. does your alarm work?

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post #5 of 23 (permalink) Old 1-27-08, 11:23
 
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The rear defroster works in parallel, not series. This means that some of the lines can work, with some not working. If the entire defroster isn't working, then check the tabs like rockstar mentioned. You can also test if power is going to the connectors by turning on the defroster, and checking voltage across the power/ground terminals (black plugs stuck on window tabs). It should read 12V +/-.

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post #6 of 23 (permalink) Old 1-29-08, 21:56
 
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grab yourself a test light. Ground it and begin to check parts of the grid. If none of it works i would start searching for a short in the wiring. Possibly from the relay to the rear.

A test light is a great tool if you know how to use it. Also a multimeter is another great tool to master. Good luck

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post #7 of 23 (permalink) Old 1-30-08, 0:22 Thread Starter
 
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ya i might try that tomorrow maybe it's been raining or snowing here

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post #8 of 23 (permalink) Old 1-30-08, 6:43
 
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with the test light you should be able to check each bar. They do run in a parallel circuit so some might be out and some may work. I'd say if the whole thing doesn't work i'd start around the relay and check for a bad ground. Seems like on my car all the grounds needed cleaning or recrimped into the connector.

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post #9 of 23 (permalink) Old 1-30-08, 11:53 Thread Starter
 
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hmm ok, i tried checking it with multimeter and apparently the defroster is still working.
idk why it's so slow to get rid of the fog and ice tho !

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post #10 of 23 (permalink) Old 1-31-08, 21:20
 
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how slow is slow, like 10 mins or more or something less.

Also have you checked any grounds? maybe its getting voltage but not the full 12v. Just curious what the voltage reading was?

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post #11 of 23 (permalink) Old 2-2-08, 10:09 Thread Starter
 
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to be honest with u man... i cant read multimeter for crap rofl ! a little bit inexperienced in life

but the needle moved all the way to the right with 1K ohm setting..


lol sorry for the noobness!


oh yeah it's more than 10 mins alright.. even the front is kinda acting up now =/! i cant clear the fog from my upper front windshield.. sigh!!

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post #12 of 23 (permalink) Old 2-3-08, 0:17 Thread Starter
 
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okay.... so here's the thing.. idk what happened but last night was raining (freezing rain) and when all of the sudden i heard a loud thump from my rear window.. i thought someone threw something at my car, but my friend was outside and he didn't see anything.

So, in the morning when i was driving my friend noticed pieces of glass on the rear seats and.... yup! my window is shattered!! i didnt know what happened but it cracked and there's hole where the tab is. luckily the tint kept the window from falling apart or it would be unfortunate for my gf and my friends in the back seats... i'll post pic later tomorrow. It's now held in place with duct tape


sigh.. end of rant.

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post #13 of 23 (permalink) Old 2-3-08, 1:33
 
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well............i suppose the prob isn't the defog now.

My guess is that maybe it was on and the glass got hot enough that when the rain hit it, it cooled it down causing it to bust?

I'm sure you would see the defog light but unless a truck or something dropped a rock off of it kinda weird the window would just bust. Sucks, guess now you'll have new gridbars.....that is when you can afford the ever annoying bill that comes with them.

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post #14 of 23 (permalink) Old 2-3-08, 7:53 Thread Starter
 
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Quote:
Originally Posted by 4cylfun View Post
Sucks, guess now you'll have new gridbars.....that is when you can afford the ever annoying bill that comes with them.

so true man

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post #15 of 23 (permalink) Old 2-3-08, 16:49
 
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Check the defogger reset button under driver's dash by fusebox as well.
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