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Rear Window Defogger Not Working -- 2006 Toyota Corolla

HELP! We recently bought this car--and the rear defogger won't turn on. I checked the fuse-box and the designated fuse was fine, but noticed on the diagram that there was yet another "defogger" label right next to it that appeared to 'maybe' be a spot where some larger unit--a circuit or switch maybe--was to be located. There was nothing inserted in that spot/slot in the fuse box and I was wondering if in fact it's missing or if that slot is just there for another model's use or something. If something IS supposed to be there then that's probably the problem and I need to get one to replace it. But if the '06 Corolla doesn't require anything in that slot, then what else should I look for as potential causes?

THANK YOU in advance for any/all help!!! --David

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  • humanrace1 Jan 14, 2009

    Maybe I'm being impatient, but this was posted over 24 hours ago and there's been zero help or advice given. How long does one have to wait here at FixYa before feeling "compelled" to click for PAID assistance here instead? Is there actually some sort of help for each inquiry, and if so, how long does it take typically to get it? Maybe I 'am' being too impatient, but never having used FixYa before I have no clue what to expect. So--bottom line, I'm venting and expressing my frustration and impatience, possibly due entirely to my own ignorance. :-) Can someone clue me in? Better yet HELP me?! Thank You!!!! --David

  • humanrace1 Jan 14, 2009

    No Solutions--no comment. 48 hours, 72 hours, 96...

  • humanrace1 Jan 22, 2009

    No Solutions--no comments. 10 days later... is there anyone out there or in the website's employ with a quick and simple answer to this very small question?

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5 Suggested Answers

  • 1861 Answers

SOURCE: 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.


Posted on Oct 20, 2008

  • 2039 Answers

SOURCE: 2003 olds alero rear windoe defogger

the rear passager panel the one that cover the side rear window there a relay connector in there that were the power to window go that defectif that gonna FIXYA our post thank you pierre

Posted on Jul 06, 2008

Tech jk
  • 102 Answers

SOURCE: 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.

Posted on Jan 04, 2009

  • 1 Answer

SOURCE: Radio cuts out when rear window defogger is turned on(05' Altima)

I have the same problem in my 2003 Altima. I had a friend who works on cars check it out. I watched him and when he removed the panel under the steering wheel next to the driver's door you could hear a clicking noise. He said is sounds like my defogger relay/switch is bad. I located the part and it is not that expensive. I am going to purchase the part and have it put on. I will keep you posted to let you know if it solves my problem. If it does I will give you the name of the part so you can hopefully solve your issue.

Posted on Mar 23, 2009

  • 1 Answer

SOURCE: REAR DEFOGGER NOT WORKING 2000 OLS ALERO

There's a junction box behind passenger rear door that has 2 wires that are joined from the front and control the rear defroster and radio antenna.

Posted on Mar 24, 2009

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Which fuse box on the 2011 Chevy Malibu is the fuse for the rear defrost


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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
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• 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).
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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.
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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...


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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
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4. Connect test light between defogger relay harness connector terminals A2 (Red wire) and B3 (Purple wire). If test
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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
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2 Answers

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The rear defogger is fuse #14 (40 Amp fuse) in the underhood fuse box,no other fuses, I have the owners manual. If the fuse checks good test the heater grid of the rear defogger, it is most likely is an open circuit, it can be repaired by the dealer or u..

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1 Answer

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


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