Question about 1999 Toyota 4Runner

1 Answer

Rear deffoger not working

Rear defogger not working 2005 toyota forunner

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  • Toyota Ed May 11, 2010

    Before you do anything, check to see if the rear wiper and washer are not working also. If they are not, the rear window is not all of the way up.

    None of the 3 work if the rear window is down just a bit.

    Try this & get back to me.

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  • Toyota Master
  • 1,861 Answers

DId you try lowering and raising the window fuilly?
Is the problem still present?

Posted on Dec 26, 2008

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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:
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• Body control module (BCM)
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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).
When you turn ON the ignition and press the rear window defogger switch for the first time, the defogger cycle lasts 10 minutes. Further operation results in 5 minute defogger cycles.

Do you know what your messing with ? What's the problem ?

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Where is junction box 1 in a 1995 Toyota Camry? It is supposed to be under the dash.


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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
The 30 amp DEF fuse is in the fuse box under the hood
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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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