Question about 1993 Buick LeSabre

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Rear window defogger not working

I have a 1993 Buick LeSabre with 535,000 km's and for some reason the rear window defogger no longer works. When i engage the switch for operation it lights up as if ON ...but none of lines in the rear window show any signs of warming up. What could the problem be. ???

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  • 14 Answers

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

Posted on Dec 11, 2008

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Posted on Jan 02, 2017

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1 Answer

My rear defroster won't work I have a 2000 Buick Park Avenue


Could be a bad relay !
The rear defogger circuit is protected by a 40A fuse. Voltage is supplied through the fuse to the rear defogger relay. When you press the rear defogger switch, the heater and A/C programmer sends a class 2 message to the body control module (BCM), to ground the rear defogger relay coil output circuit. This in turn closes the relay contacts allowing current to the rear window grid.
Do you know what a class 2 message is ? What a BCM is ?
HTD BK relay in rear fuse box ,location In the center right rear of the passenger compartment, under the rear seat cushion
Watch this video on testing from relay base ( where it plug's into )
Do
VEHICLE RELAYS Testing from the relay base

Oct 05, 2016 | 2000 Buick Park Avenue

1 Answer

Why doesn't heat controller work?


I get that you can't turn it off, but what do you mean you cant "set" it? It's either on or off. When it's on (which sounds like all the time) does it work - defog/defrost the back window. If you can't turn it off, your choices are to either leave it on all the time (which may run your battery flat eventually) or replace an obviously bad switch. . .

Feb 18, 2016 | 1995 Buick LeSabre

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

Where is the location of rear window defogger relay?


this relay is located as part of the switch itself. when you replace the switch you are replacing the relay.

Aug 08, 2014 | 1990 Buick LeSabre

1 Answer

I've taken out the relay to turn off my front


Are you sure that is not the AC compressor relay?
I don't know your car, but not aware of any cars having a defroster relay, a defogger relay for the rear window with the electric grid in the window, yes. Never heard of a defroster relay.

Sep 22, 2013 | Cars & Trucks

1 Answer

1993 honda s/w rear window defrost quit working


Do you have 12 volts to the rear window grid at the grid connector, check and make sure it is attached to the window, it is the single biggest reason for failure.

Feb 20, 2012 | Honda Accord Cars & Trucks

1 Answer

Location of rear window defogger relay in 1999 buick lesabre


  • Remove the passenger hush panel under the dash. Recline the seat way back and lay backwards and look way up under the dash. Use a flashlight to make this a bit easier too. Here is your diagram.



11_8_2011_4_24_41_am.jpg

  • Hope this helps.

Nov 08, 2011 | 1999 Buick LeSabre

1 Answer

Where is fuse for windshield wiper pump located ? fluid does not spray and no sound from motor. Motor was replaced still does not work. Rear window defogger does not work. Thank You


This must be the fuse and is found under the dash within the car. If the fuse blows out then you must check the wiring to the front washer motor and to the rear.
Disconnect and check the rear and the front washers.

Jan 20, 2011 | 2000 Buick LeSabre

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

Rear window defogger doesn't work. Fuse appears to be OK. Light on control panel lights up but rear window doesn't defog.


Either your control module is burned out or your window contacts have become detached. Permatex offers an electrically conductive adhesive for the latter (less than $10). For the module, it's a combo radio antenna and defrost control. It's located on passenger side in back at the pillar. You have to take off the fabric panel to get to it.

Sep 26, 2009 | 1996 Buick LeSabre

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