08-27-2021, 12:24 AM
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#1
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Member
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Join Date: Aug 2019
Location: Venezuela
Age: 71
Posts: 145
Real Name: Carlos V.
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Member
Join Date: Aug 2019
Location: Venezuela
Age: 71
Posts: 145
Real Name: Carlos V.
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how to disable rear defrost
I am afraid of bursting my rear window. Is there an easy way to temporary disable rear defrost (never use it, but accidentally gets turn on when putting thing in cup holders w/o me notice etc). The fuse(#15) in the engine bay for this involve other systems (multiport fuel injection). 2003 V6. Thanks
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Gold 2003 4Runner SR5 V6 2WD A340E
Grabber A/T, Brembo rot, Akebono pads, Optima batt, HKB Volt. booster, Buffalo Bayou recovery
Sony XAV1000, LED interior and reverse, Weathertech, Flux-Turbocharged tire valve caps.
Last edited by CarlosV; 08-27-2021 at 12:58 AM.
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08-27-2021, 06:48 AM
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#2
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Senior Member
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Join Date: Nov 2016
Location: South Carolina
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Real Name: Skip
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Senior Member
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Quote:
Originally Posted by CarlosV
I am afraid of bursting my rear window. Is there an easy way to temporary disable rear defrost (never use it, but accidentally gets turn on when putting thing in cup holders w/o me notice etc). The fuse(#15) in the engine bay for this involve other systems (multiport fuel injection). 2003 V6. Thanks
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Remove the interior hatch panel and then unplug the electrical connector on the window and secure it out of the way of any moving parts.
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2004 Limited V8
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08-27-2021, 10:18 AM
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#3
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Member
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Join Date: Aug 2019
Location: Venezuela
Age: 71
Posts: 145
Real Name: Carlos V.
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Member
Join Date: Aug 2019
Location: Venezuela
Age: 71
Posts: 145
Real Name: Carlos V.
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thanks a lot once again Auseeker
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Gold 2003 4Runner SR5 V6 2WD A340E
Grabber A/T, Brembo rot, Akebono pads, Optima batt, HKB Volt. booster, Buffalo Bayou recovery
Sony XAV1000, LED interior and reverse, Weathertech, Flux-Turbocharged tire valve caps.
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08-27-2021, 11:01 AM
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#4
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Senior Member
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Join Date: May 2014
Location: Rio Rancho, New Mexico
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Senior Member
Join Date: May 2014
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Quote:
Originally Posted by CarlosV
thanks a lot once again Auseeker
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Alternately, break rear window with a bat. Not a problem if there is no glass to explode!
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08-27-2021, 04:33 PM
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#5
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Member
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Join Date: Aug 2019
Location: Venezuela
Age: 71
Posts: 145
Real Name: Carlos V.
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Member
Join Date: Aug 2019
Location: Venezuela
Age: 71
Posts: 145
Real Name: Carlos V.
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brilliant! You should go to rest after this one :-)
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Gold 2003 4Runner SR5 V6 2WD A340E
Grabber A/T, Brembo rot, Akebono pads, Optima batt, HKB Volt. booster, Buffalo Bayou recovery
Sony XAV1000, LED interior and reverse, Weathertech, Flux-Turbocharged tire valve caps.
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08-27-2021, 08:51 PM
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#6
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Senior Member
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Join Date: May 2014
Location: Rio Rancho, New Mexico
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Senior Member
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Quote:
Originally Posted by CarlosV
brilliant! You should go to rest after this one :-)
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Lol enjoy your weekend!
Seriously though I never use that defrost button at all out of fear. I should unplug it myself.
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08-28-2021, 04:33 AM
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#7
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Join Date: Mar 2021
Location: South East UK
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Member
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What's all this about exploding rear windows?
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2008 2.7 2WD 4 speed (Tacoma-Runner?)
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08-28-2021, 09:09 AM
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#8
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Join Date: Sep 2014
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Quote:
Originally Posted by SurferUK
What's all this about exploding rear windows?
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The apparent cause IIRC is unequal heating of the rear glass in defrost mode due to deterioration or breakage of the filament. So part of the glass heats up & expands slightly but the rest doesn’t. Under certain conditions, this leads to unexpected shattering of the rear glass.
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08-28-2021, 10:50 AM
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#9
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Senior Member
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Join Date: May 2014
Location: Rio Rancho, New Mexico
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Quote:
Originally Posted by SurferUK
What's all this about exploding rear windows?
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Several members over the years have reported their rear sliding glass exploding. Always in cold weather when they try to use the rear window defrost button.
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08-28-2021, 12:59 PM
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#10
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Join Date: Mar 2021
Location: South East UK
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Quote:
Originally Posted by montijo505
Several members over the years have reported their rear sliding glass exploding. Always in cold weather when they try to use the rear window defrost button.
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Quote:
Originally Posted by Bluesky 07
The apparent cause IIRC is unequal heating of the rear glass in defrost mode due to deterioration or breakage of the filament. So part of the glass heats up & expands slightly but the rest doesn’t. Under certain conditions, this leads to unexpected shattering of the rear glass.
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Thanks for that - I don't think I would find that glass for sale here anywhere so I will leave that button alone!
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2008 2.7 2WD 4 speed (Tacoma-Runner?)
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08-28-2021, 02:44 PM
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#11
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Senior Member
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Join Date: Nov 2016
Location: South Carolina
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Real Name: Skip
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Senior Member
Join Date: Nov 2016
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Real Name: Skip
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Quote:
Originally Posted by SurferUK
What's all this about exploding rear windows?
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Quote:
Originally Posted by Bluesky 07
The apparent cause IIRC is unequal heating of the rear glass in defrost mode due to deterioration or breakage of the filament. So part of the glass heats up & expands slightly but the rest doesn’t. Under certain conditions, this leads to unexpected shattering of the rear glass.
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Quote:
Originally Posted by montijo505
Several members over the years have reported their rear sliding glass exploding. Always in cold weather when they try to use the rear window defrost button.
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I'm pretty sure I read the reason the glass was breaking was the electrical connection area itself was overheating and thus heating that corner of the glass causing uneven expansion which breaks the tempered glass.
Also here's a link to the Toyota "Extended Warranty" Technical Service Bulletin explaining the coverage, condition/inspection, etc. and it states that the condition can be identified by broken glass and discoloration surrounding the defroster electrical connector, there are photos as well.
https://static.nhtsa.gov/odi/tsbs/20...31801-9999.pdf
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Last edited by AuSeeker; 08-28-2021 at 02:52 PM.
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08-28-2021, 04:37 PM
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#12
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Senior Member
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Join Date: May 2014
Location: Rio Rancho, New Mexico
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Join Date: May 2014
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Quote:
Originally Posted by AuSeeker
I'm pretty sure I read the reason the glass was breaking was the electrical connection area itself was overheating and thus heating that corner of the glass causing uneven expansion which breaks the tempered glass.
Also here's a link to the Toyota "Extended Warranty" Technical Service Bulletin explaining the coverage, condition/inspection, etc. and it states that the condition can be identified by broken glass and discoloration surrounding the defroster electrical connector, there are photos as well.
https://static.nhtsa.gov/odi/tsbs/20...31801-9999.pdf
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The takeaway here is, DO NOT use the defroster. Don't be lazy and scrape the rear window before your drive.
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08-30-2021, 05:02 PM
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#13
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Senior Member
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Join Date: Dec 2018
Location: New Hampshire
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Real Name: Mike
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I wonder how often this actually happens percentage wise. I use mine often in the winter but always shut it off as soon as it is cleared, I don't let it stay on. No issues and it's an old truck.
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03 4runner Limited
1GR-FE V6 w/199k miles
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08-30-2021, 05:17 PM
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#14
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Junior Member
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Join Date: Jul 2021
Location: Pittsburgh PA
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You can probably unplug the switch in the dash, or, if you don't roll down the rear window just roll it down ever so slightly. That will disable the rear defroster as well as the wiper and side view mirror heaters.
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08-30-2021, 05:38 PM
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#15
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Member
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Join Date: Aug 2013
Location: Wisconsin
Posts: 105
Real Name: Craig! Craig Christ!!
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Member
Join Date: Aug 2013
Location: Wisconsin
Posts: 105
Real Name: Craig! Craig Christ!!
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Quote:
Originally Posted by Bluesky 07
The apparent cause IIRC is unequal heating of the rear glass in defrost mode due to deterioration or breakage of the filament. So part of the glass heats up & expands slightly but the rest doesn’t. Under certain conditions, this leads to unexpected shattering of the rear glass.
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Holy Crap I never heard of this... it makes sense... I always use my rear defrost and some winter days here get 40-50 below... probably literally shit if i was on the way to work and rear window shattered without warning... man that kind of sucks! I'm pretty sure that same button also powers the side mirror defrost.... right unplug at rear door not switch...
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