Question about 2004 Chevrolet Monte Carlo

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My rear defogger stopped working. Where do we start to try and fix it ourselves?

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Check the fuse or a lose wire or it it could be the switch it self.

Posted on Nov 15, 2010

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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

3 Answers

How come on my 2005 pontiac aztek if i take out the rear defroster fuse (#21) the light still lights up on my dash and the relay still clicks?? Help why did this rear defroster stop working?!?


I found this. Your heated mirror also works off that relay. You can do ohms test on the grid, if the grid is open, no continuity. The auto store should sell a product to paint over the open spot to restore continuity, if you can find the open spot.
Not trying to cause trouble, just killing time. Have a good day.
come-2005-pontiac-aztek-out-rear-ed5fvbjuyfmssjamkecfw2ck-4-0.jpg

Oct 24, 2016 | Pontiac 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

My 2006 Trailblazers license plate lights, rear window wiper & rear defogger all stop working at the same time & then will start working again whenever it feels like it


This is a thinking mans problem .You have nothing really wrong except a bad ground or connection . I would take a look at the wireing to all of the rear lights make sure they all work all of the time NO other lights haveing problems. If you don't find a problem you need to look at the switches for the rear wiper and defogger .their one over another try unpluging the connecters or wiggleing them around to see what happens this is a good way to isciluate simply a bad connection before you disassamble your dask board. Always do the the easyest and cheapest tests first that give you the most amount of information for the least amount work this will save you time and money everytime

Feb 20, 2015 | 2006 Chevrolet Trailblazer

1 Answer

1998 pontiac sunfire


you have a bad ground .sorry cant tell you where to look to clean the connection .

May 21, 2014 | 1998 Pontiac Sunfire

1 Answer

Remote start and rear electric window defogger problem


check for break in the wiring at your trunk/boot.

Dec 18, 2013 | 2008 Saturn VUE

1 Answer

I have a 1999 taurus. the rear windows , rear window defogger and rear power door locks don't work. Could there be a connection?


Yes, there could be a connection, test your Fuses.

It is also a Taurus and have numerous problems also....

you are going to need to test the systems, but I would start under the hood and test the fuses

Apr 16, 2013 | 2004 Ford Taurus

1 Answer

My 2004 6cfl. Trailblazer rear window defroster is not working. The wires appear to be making a good contact. The outside mirrors defrost ok using the same switch as the test window defroster. Is there...


There is a module that controls the rear window defogger grid . LGM/ EGM Liftgate or endgate module .Receive's message on class 2 serial data network from the HVAC control module to turn it on when button pressed . Fuse # 3 30 amp located in the rear fuse box . Do you know where the rear fuse box is ?
Rear Window Defogger Description and Operation
Rear Window Defogger System Components
The rear window defogger system consist of the following components:
• HVAC control module
• Liftgate module (LGM)/endgate module (EGM)
• Rear window defogger grid
Rear Window Defogger Operation (With LGM)
Battery positive voltage is supplied through the LGM 2 fuse to the LGM for the rear window defogger system. 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 LGM to enable the rear window defogger. The LGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.
Rear Window Defogger Operation (With EGM)
Battery positive voltage is supplied through the EGM 2 fuse to the EGM for the rear window defogger system. 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 EGM to enable the rear window defogger. The EGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
The following conditions must be met for rear window defogger to operate:
• The end gate glass position is not below the index position.
• The window express down movement is not requested.
• The window down movement is not requested.
If the end-gate glass is not fully closed, the DIC displays "Tailgate Glass Down" when the rear defogger operation is attempted.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.

Fuse Block - Rear
Beneath the left rear seat

Jul 13, 2017 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

2002 Alero defogger


A common thing to fial on these- assumning the grid is ok, and wires are still attched to grid, is the rear def / antenna module. It is behind rt. rear quarter trim panel. The modules burn up, and also melt the connector. the module and connector would need to be replaced.

Dec 06, 2008 | 2003 Oldsmobile Alero

1 Answer

Rear defogger


The switch is part of a timer module that controls the rear defogger grid on the glass, they fail and create the problem you described, replace the module.

Oct 01, 2008 | 2001 Saturn L-Series

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