Question about 2006 Chevrolet Impala

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2006 rear defogger is not working

I replaced the relay but it is still not working can you tell me if there is a fuse I might need to replace?

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  • Anonymous Jan 13, 2009

    keishalock74, I have the same problem although I have not yet tried to replace the relay.

  • Paula Gib Jan 26, 2009

    I also have a 2006 Impala with the same issue.....I replaced relay and it still doesn't work. The button light comes on.

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I'm fortunate to work at an auto body shop. There is a technician here that loves these problems. We also have a wealth of source material at our disposal, which supplied no clues as to the problem. So needless to say this one stumped even him. While I was researching this rear window defroster issue on the internet I came upon a page that had the end fix for my car. Under the passenger side dash - mounted near the front passenger door jamb there is a fuse box with a wiring harness. Open the wiring harness to observe if there is a burn mark from a poorly connected wire (see pictures) if this is the case... (this repair is not recommended but it works) clip and seperate the offending wires from the harness and wire them together. then clean the wire harness from left over wires to prevent further short circuuits when the harness is reconnected. test the rear window defroster if it works you're good to go. Please consider placing in line a fuse. I don't believe you need one but the tech here put one in just in case. He used a 30 amp Sorry no photos-files are too big but trust me if there is an issue at this spot you'll know it. it is very obvious

Posted on Nov 29, 2010

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It may not be either one. sometimes the wire on the back window comes unsodered from the wires that go acrose rear window, hence no power to rear defrost. might want to chk.

Posted on Jan 17, 2009

  • joebourassa Feb 05, 2011

    I went a long time without that rear defrost. I followed your advice, and sure nough there was the short as described. Thank you/!! Easy fix.

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Check both sides of back window if small cable slipped out push it right back in

Posted on Jul 15, 2009

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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

My heater only works some of the time and my rear defrost dont work what could be the problem


As by heat only works some of the time , you mean it doesn't blow air out of the vent's . This means you probably have a problem with the blower motor or blower motor resistor or blower motor relay .
Rear Window Defogger Inoperative

    Exchange the rear defogger relay with a known good relay from the under hood junction block.
  1. Turn the ignition switch to the ON position.
  2. Press the rear defogger switch to the ON position.
Does the rear defogger grid warm?
--
Yes Go to Step 2
NO Go to Step 3

2

Replace the faulty relay.
Is the repair complete?
Go to Defogger System Check --

3

  1. Use a fused jumper wire in order to backprobe between terminal A4 of underhood junction block connector C3 and ground.
  2. Use a test lamp in order to backprobe between terminal C5 of underhood junction block connector C3 and ground.
Does the test lamp light?
--
Go to Step 4
Go to Step 23

4

  1. Use a test lamp in order to backprobe between terminal C5 of underhood junction block connector C3 and ground.
  2. Press the rear defogger switch to the ON position.
Does the test lamp light?
--
Go to Step 5
Go to Step 14



Mar 23, 2016 | 1999 Oldsmobile Alero

1 Answer

Rear window defogger stopped working


In the fuse block, you will find 25A FUSE 17 which feeds the rear window defogger relay coil and 30A circuit breaker 4 which feeds the contacts.

Dec 26, 2013 | 1993 Buick LeSabre

1 Answer

Rear window defogger connector not working 2006 yukon" broke off window


Your local dealer should have a replacement 'tab' which can sometimes be soldered back onto the glass. Sometimes it just doesn't work and the glass will need to be replaced. I have done many of these, it is a 50/50 shot

Feb 27, 2013 | 2008 GMC Yukon

1 Answer

Power windows, rear defogger and exterior mirror defogger quit working


IF you checked the fuses and relays, them it sound like it might be wiring or wiring connector might be loose.

Jan 05, 2013 | 1994 Isuzu Trooper

1 Answer

I have an '03 Olds Alero and the rear defrost is not working...replaced the relay....switch lights up and continuity is good across the grid. I put the relay in both ways..not knowing if it makes a...


The relay can go in either way--no problem. The relay runs off 2 different fuses--one to power the relay itself and one to power the defogger. Make sure both fuses 33 and 46 in the engine compartmet fuse box are good.
Next, have someone listen to the relay while you turn on the defogger to see if it's clicking. If it isn't clicking, the problem is before the relay--probably in the control panel.
If the relay is clicking, the problem may be with the antenna amplifier (radio borrows the defogger grid to improve reception). Not sure where that module is but would guess it's in the right pillar by the passenger's fuse box. If you can find it, check continuity across the 2 black leads. Also verify the back side of the defogger is getting it's ground.
Please let me know if you have more questions.

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Nov 02, 2010 | 2003 Oldsmobile Alero

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

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 dont work replaced relay & fuse still dont work


REAR WINDOW DEFOGGER SWITCH IS BAD OR YOUR REAR WINDOW HAS A BROKEN PLACE IN THE GRID.

Nov 01, 2009 | 1999 Oldsmobile Alero

1 Answer

2001 Sienna rear window defogger doesn't work


There are 3 fuses that control the rear defogger, and 1 relay

The fuses are: 10 amp HEATER, 10 amp MIRROR-HEATER; under the dash
The 30 amp DEF fuse is in the fuse box under the hood
The relay is the DEFOGGER relay, which is on the back side of the fuse panel under the dash

Also, check for a loose wire on the defroster grid (on the back glass), this is the most common problem.


Oct 19, 2008 | 2001 Toyota Sienna

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