Question about 1992 Saturn SL2

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Some functions stop working like the glass defogger, Ac, and is not counting the miles no more and I'd like to know if this is controlled by the computer and where is it?

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Hi..
there may be some junction box or relay which controls all these fucntions together.try replacing it.i exactly dono the location of these. think it may be situated under the steering wheel where you have all relays.

Posted on Jul 10, 2010

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Posted on Jan 02, 2017

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The windshield defogger stopped working properly, IS THIS BECAUSE OF THE VERY LOW TEMERATURE WE HAD LAST WEEK IN toronto area?


cold is heavily laden with moisture and when your breath (warm) hits the cold screen then the glass fogs up. The answer is to reduce the amount of water vapour in the air inside the car and in effect that is what an ac does. It dehumidifies the air and the fogging lessens quickly. How to do this with out freezing . Simply run the heater on full blast with the ac unit running at the same time In some cars it is called climate control

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I have a 2002 jeep grand Cherokee ltd high output eng. Had a problem with the interior glass fogging up. Bought defogger and stop leak. The fogging is gone due to the defogger but I can still smell...


The labor book time is 6.0 hrs,Shop will have to evacuate the A/C ,remove the dash to access the heater A/C unit,expect to pay about $450.00 plus the part,$250.00 about that much.

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My 2004 6cfl. Trailblazer rear window defroster is not working. The wires appear to be making a good contact. The outside mirrors defrost ok using the same switch as the test window defroster. Is there...


There is a module that controls the rear window defogger grid . LGM/ EGM Liftgate or endgate module .Receive's message on class 2 serial data network from the HVAC control module to turn it on when button pressed . Fuse # 3 30 amp located in the rear fuse box . Do you know where the rear fuse box is ?
Rear Window Defogger Description and Operation
Rear Window Defogger System Components
The rear window defogger system consist of the following components:
• HVAC control module
• Liftgate module (LGM)/endgate module (EGM)
• Rear window defogger grid
Rear Window Defogger Operation (With LGM)
Battery positive voltage is supplied through the LGM 2 fuse to the LGM for the rear window defogger system. 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 LGM to enable the rear window defogger. The LGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.
Rear Window Defogger Operation (With EGM)
Battery positive voltage is supplied through the EGM 2 fuse to the EGM for the rear window defogger system. 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 EGM to enable the rear window defogger. The EGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
The following conditions must be met for rear window defogger to operate:
• The end gate glass position is not below the index position.
• The window express down movement is not requested.
• The window down movement is not requested.
If the end-gate glass is not fully closed, the DIC displays "Tailgate Glass Down" when the rear defogger operation is attempted.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.

Fuse Block - Rear
Beneath the left rear seat

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1 Answer

Rear defogger


check grids along rear window to check for broken lines and check wires on both sides of glass where connections are.

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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
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.


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The switch is part of a timer module that controls the rear defogger grid on the glass, they fail and create the problem you described, replace the module.

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1 Answer

The ac won't work right


The first knob controls the temperature. Turning it counterclockwise will lower the temperature, clockwise will raise it. Pressing the button will turn on the circulate function (recirculates the air from the cabin).
The second knob controls the fan speed. Counterclockwise will reduce the fan speed, clockwise will increase it. Pressing the button activates the A/C compressor (allows colder temperatures).
The third knob controls the flow direction. Each picture indicates where the flow will go. Pressing the button activates the rear defoggers (in some models, it will also activate the heated side mirrors).

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