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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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

1998 buick park ave. rear window defroster not working. fuse is good, has anyone replaced the black box located next to rear window where element plugs into along with the antenna. element on window is not...


Rear Defogger Inoperative, But Heated Mirrors Operate Correctly
1. Connect scan tool. Turn ignition switch to RUN position. Turn rear defogger on. Using scan tool, display BCM
outputs. If rear defogger is being requested on, go to next step. If rear defogger is not being requested on, go to
step 10).
2. Ensure ignition switch is in RUN position. Remove rear defogger relay from rear junction block, located on center
right rear of passenger compartment, under rear seat. Connect test light between ground and defogger relay
harness connector terminal F3 (Brown wire). If test light illuminates, go to next step. If test light does not
illuminate, go to step 11).
3. Connect test light between ground and defogger relay harness connector terminal A2 (Red wire). If test light
illuminates, go to next step. If test light does not illuminate, go to step 12).
4. Connect test light between defogger relay harness connector terminals A2 (Red wire) and B3 (Purple wire). If test
light illuminates, go to step 13). If light does not illuminate, go to next step.
5. Disconnect rear defogger positive and negative feed bus connectors. Connect a jumper wire between defogger
relay harness connector terminals F3 (Brown wire) and A4 (White wire). Connect test light between ground and
positive feed bus connector terminal "A" (Black wire). If test light illuminates, go to next step. If test light does not
illuminate, go to step 8).
6. Connect test light between positive feed bus connector terminal "A" (Black wire) and negative feed bus connector
terminal "B" (Black wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 9).
7. Repair open in Black wire between rear defogger and ground. Recheck system operation.
8. Repair open in Purple wire between rear junction block and heated backlight antenna module. Recheck system
operation.
9. Check for proper terminal contact at rear defogger connectors. Repair as necessary. Recheck system operation.
10. Check for proper terminal contact at BCM. If terminal contact is okay, replace BCM. Recheck system operation.
11. Repair open in Brown wire between rear junction block and instrument panel junction block. Recheck system
operation.
12. Repair open in Red wire between rear junction block and underhood junction block (located in right front corner of
engine compartment, between battery and strut tower). Recheck system operation.
13. Connect test light between defogger relay harness connector terminals F3 (Brown wire) and A4 (White wire). If
test light illuminates, go to next step. If test light does not illuminate, go to step 16).
14. Reinstall defogger relay. Disconnect BCM 32-pin Pink connector C2. BCM is located behind right side of instrument
panel, near rear of glove box. Using DVOM, check voltage between ground and BCM harness connector C2
terminal A3 (White wire). If any voltage is present, go to next step. If no voltage is present, go to step 17).
15. Repair open or short to ground in White wire between rear junction block and BCM. Recheck system operation.
16. Check for poor connection at defogger relay terminals. If connections are okay, replace defogger relay. Recheck
system operation.
17. Check for proper terminal contact at BCM. If terminal contact is okay, replace BCM. Recheck system operation.

Feb 25, 2010 | 1998 Buick Park Avenue

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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