Question about 1992 Buick LeSabre

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Front window defog is out and no light indicator for it

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Check fuse

Posted on Jul 25, 2013

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1 Answer

Which fuse box on the 2011 Chevy Malibu is the fuse for the rear defrost


Fuse box rear , fuse #23 30 amp ! Do you know where this is located ? There is also a relay for the Rear window defogger , located in the same rear fuse box .
Fuse Block - Rear
Left side of the luggage compartment, behind the left rear wheel well . But you really need to know how it works , you can check fuse an relay .
Rear Window Defogger Operation
Battery positive voltage is supplied through the BATT 1 fuse in the underhood fuse block to the rear defog relay switched input. When the rear defog switch button is pressed, the body control module (BCM) energizes the rear defog relay by providing a B+ to the control circuit of the rear defog relay. This allows battery positive voltage from the relay switched input through the switch contacts and out the relay switched output to the rear window defogger grid. The HVAC control module houses the rear defog switch and also illuminates the rear defog indicator on the switch button, upon this request. Ground for the rear window defogger grid is provided by G301 for the Sedan or G302 For the Extended Sedan.

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1 Answer

Wiring diagram for rear window defogger 2005 silverado from dash to deffoger


Rear Window Defogger System Components
The rear window defogger system consist of the following components:
• HVAC control module
• Body control module (BCM)
• DEFOG relay
• Rear window defogger grid
Rear Window Defogger Operation
When you turn the ignition to the ON position, ignition voltage is supplied to the DEFOG relay coil. Battery positive voltage is supplied at all times to the DEFOG relay switched input. When the rear window defogger switch is depressed, the HVAC control module illuminates the rear window defogger indicator and sends a class 2 message to the BCM. The BCM energizes the DEFOG relay by grounding the control circuit of the relay. This allows battery positive voltage from the relay switched input through the switch contacts and out the relay switched output to the rear window defogger. Ground for the rear window defogger is provided by G306 or G390 (crew cab).
When you turn ON the ignition and press the rear window defogger switch for the first time, the defogger cycle lasts 10 minutes. Further operation results in 5 minute defogger cycles.

Do you know what your messing with ? What's the problem ?

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2008 Honda Fit Sport.


Check the engine coolant level first and see what shows up.

Sep 23, 2016 | 2008 Honda Fit Sport

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Why is my rear defrost not working


Switch, fuse or maybe the wiring to the window has come loose or off, happens alot, kits are available at local auto parts stores...
I hope that helps...

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Demister not working but light is on


A demister, ?
my guess, is the rear window , defog/defroster heater is dead.
right.?
this is easy , is there 12vdc across the heater element.
Yes the the grid is cut. open. damaged
NO? then the relay or switch up front or fuse is bad.
there i cut the problem in 1/2 for you.


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My alternator doesnt appear to be charging the battery. I charged the bettery to about 75% and it just died on me by the next day. i did notice that the rear defog light was on solid even with the truck...


when u shut the car off use a volt tester and test the battery your looking for any drain on the battery or the batter may not be able to hold a charge anymore.

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Are either on of the tabs that are soldered to the window broke off?

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1997 - Toyota Corolla -- Rear window defog not working


On each side of the Window (Could be at top or Bottom0 There are Small Slide on Wiring Connectors. Sometimes these Get Loose. I would start There.

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