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Rear window defogger does not work in 2007 impala

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Ck relay under hood for click when defog button is pushed,if this relay clicks switch and relay should be ok,just found same problem with mine,remove right kick panel where the little fuse box is located and large connector under it i seperated and found burned connector,cut wires on both sides and ran jumper wire,make sure to use proper gauge wire,now mine works good luck

Posted on Sep 29, 2010

  • MrVal Aug 14, 2011

    My son's Impalla had the same problem. The kick panel snaps out and exposes two connectors. I separated the lower of the two connectors and saw the burned contacts. I jumpered the wires as dontov8 did. It was necessary to disconnect the upper connector to get enough room to work. Six inches of 10GA wire from my scrap bin, two wire nuts reclaimed from a house wiring project, and 20 minutes time it all it took.

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Posted on Jan 02, 2017

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SOURCE: Rear window defogger on 1997 SW2 won't work in damp, wet weather

sounds like a short. i would check and see if there is any breaks in the defroster lines in the glass. maybe you have a bad connection

Posted on Oct 22, 2009

Testimonial: "Thanks, I'll check those lines."

  • 73 Answers

SOURCE: Rear defogger/defroster is out in my 2007

The 30 amp fusible link located in the drivers side junction block controls power to the rear defoger. It is larger than a regular fuse it is pink and has a clear top.
The easiest thing to check first is just touch the terminal on the rear glass with a 12 volt test light or a DVOM to see if you have power.

Posted on Sep 21, 2009

  • 75 Answers

SOURCE: rear window defogger stopped working

More than likely something has scratched the film that heats up to do the defrosting, Look to make sure it has both wires attached, and use either a test light (make one out of a 12volt bulb and wire if you do not have one.) See if you have electricity to the wires at the ends. If you do, you have a break in the film. You should be able to see where it is broken or scratched. There is an after market repair kit for this, that is not really expensive.

Posted on Dec 21, 2008

  • 7353 Answers

SOURCE: my rear window defogger is not working. the

Some auto parts stores sell a adhesive that has copper in it. made by "Permatex" just for that problem. Ask the parts guy.

Posted on Nov 09, 2009

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  • 289 Answers

SOURCE: rear-window defogger wont work and radio cuts off when u put on

Sounds like a dead short. Disconnect the power to the radio and try the rear defog. Then to determine if it is the radio or the hater, disconnect the heater and put power to the radio. Another simple test is to, at night have the head lights on, turn the radio on see how much the lights dim. Then with the radio off, turn the rear defog on. Then try both. IF either one makes the head lights dim and not recover after a minute or so that devise is the shorted component. Check grounds on the radio and the heater.

Posted on Dec 02, 2009

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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

1 Answer

How do I re-attatch the plug for my rear window defogger to a 2007 Chevy Trailblazer?


To do it right you have to solder it-Does the Permatex not work? I'm sure they have many new gadgets like that but in my day we did it the old fashioned way-Good Luck John T

Dec 01, 2014 | 2007 Chevrolet Trailblazer

1 Answer

Rear defogger won,t work


Check basic fuses first.

If the button that works the defogger lights up continue reading.
Many Impalas and Malibus have wiring that corrodes by the passenger side kick panel along the lower side A pillar. There is a connector with many pins that gets ruined. I dunno if malibus have a fuse box here as well like the impalas, but check there. might have to sneak a peek under the carpet. but it takes like 15 minute to check.
very common for defoggers that dont work when the fuses are good and the button lights up.

May 09, 2014 | 2005 Chevrolet Malibu Maxx

1 Answer

07 impala rear defogger grid does not heat up, but it has current


there's a defect in the grid somewhere and trace it till u find the spot! once u find the spot find way to fix it! might have to replace rear glass!!

Mar 25, 2013 | 2007 Chevrolet Impala

1 Answer

My rear window defogger won't defog. I pushed the button and the light comes on but it still won't work. I checked the fuses, and replaced the relay but it still won't work. I thought maybe I need to...


check the supply that goes into the rear screen. that connector must have power when switch is "on". if got power, you need to change the window.....

Nov 23, 2010 | 2005 Chevrolet Impala

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

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1 Answer

Put on rear defogger radio goes out no signal ?


My 2007 BMW 335i put the defoggers on in the rear and fm goes out

Sep 14, 2010 | 2002 Chevrolet Impala

1 Answer

Back window defogger is not working could it just be a fuse if so where is the fuse located


There is a fuse and a relay,look under the hood in the fuse/relay box.
Some of the relays in the box will be the same part # as the rear window defogger relay.....switch it with another to check it.

Nov 08, 2009 | 2006 Chevrolet Impala

1 Answer

Rear window defogger on Nissan ExSaloon N16


Are the 2 connectors (male) fitted tightly on the rear window? Sometimes you have to have them resoldered. I used special electric glue. Canadian Titr. You can also use alum. duct tape. Good luck.

Mar 27, 2009 | 2007 Nissan Maxima 3.5 Sl Sedan

1 Answer

Rear window defogger not working


make sure the wire connecting to the rear defogger is clean and connected properly

Dec 11, 2008 | 1993 Buick LeSabre

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