Question about 2003 Chevrolet Monte Carlo

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Rear defoger doesn't work

Rear deffoger doesn't work

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  • 19 Answers

Start with checking the fuse then looking at the wire or wires connected to the rear window defrost to make sure they are still connected

Posted on Feb 19, 2012

  • 1 more comment 
  • Lena MacInnis Feb 19, 2012

    where is this fuse in the 2003 monte carlo??

  • jmangum711 Feb 19, 2012

    Drivers side open door and fuse panel there on side of dash

  • jmangum711 Feb 19, 2012

    If not there then under Hood there is fusebox the fusebox covers have a diagram of what fuse is what

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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.

Nov 23, 2016 | 2011 Chevrolet Malibu

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 ?

Oct 30, 2016 | Cars & Trucks

2 Answers

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...

Mar 02, 2015 | 2008 Chevrolet Malibu

1 Answer

Battery drain


Remove the negative battery cable, connect an amp meter in series, between lead and battery terminal, should have a reading of approx 0.05 amp (Time Clock). If higher, then there is a drain, remove the fuses one at a time and watch for a drop on the amp meter. when it does you have found the circuit giving trouble. I would expect a reading of about 8 amps if it's the defog causing the problem. You could try taking the defog switch out first to see if that's the problem.

Jan 26, 2014 | 2004 Ford Explorer Eddie Bauer

1 Answer

I have a 2005 Hyundai Sonata GL v6. The rear window defog/defrost doesn't work. I have checked all fuses & all are good. Also the switch illuminates & I can hear a click in the fuse box located...


There are 2 Plugs that go into the REAR Defrost. If one of them is off, then it will not work. If you broke the Electrical Track, then it needs to be repaired... They sell kits to do this at your local Automotive Repair Stores... Time consuming but easy to do.

Apr 08, 2013 | Cars & Trucks

1 Answer

Rear defrost dont work


Rear defrost/defog is electric.Rigger says check the fuses and put the proper amp fuse in.Check owners manual for fusebox position forr rear defog.

Aug 28, 2012 | 2007 Chevrolet Optra 1.8

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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.

Jan 04, 2009 | 1997 Toyota Corolla

1 Answer

Rear deffoger not working


DId you try lowering and raising the window fuilly?
Is the problem still present?

Dec 15, 2008 | 1999 Toyota 4Runner

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