Question about 2003 Saturn ION

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Bad rear defog switch

Where can I find a " reasonably priced" replacement rear window defogger switch and how do I change it?

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  • jquesal Nov 24, 2008

    Switch is known to be bad/non-operational. Thanks.

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The only place to get another switch is the dealer or the junkyard. why are you changing switch? there is a service bulletin on poss. problems with the defrost grid in rear window. bulletin number is 04-08-48-001b call dealer for details

Posted on Nov 23, 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:
• HVAC control module
• Body control module (BCM)
• DEFOG relay
• 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).
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 ?

Oct 30, 2016 | Cars & Trucks

1 Answer

I have a 2006 Pontiac g6 gt and my heat or air will not turn on or rear defrost


You have a computer controlled HVAC system ! It has the capability of setting DTC'S - diagnostic trouble codes !
The HVAC control module is a non-GMLAN device that interfaces between the operator and the HVAC system to maintain air temperature and distribution settings. The battery positive and ignition 3 voltage circuits provide power to the control module. The HVAC control module during defrost mode will change the A/C compressor LED status from on to off. The control head displays recirc, outside air, A/C and rear defrost feedback status through LED indicators. The control head has a rear defrost request switch please refer to Rear Window Defogger Description and Operation in Stationary Windows for operation. The HVAC control head will display NO COMMUNICATION when checking DTCs or doing a vehicle diagnostic system check refer to Diagnostic Trouble Code (DTC) List - Vehicle and Diagnostic System Check - Vehicle in Vehicle DTC Information.
The rear window defogger system consists of the following components:
?€¢
Body control module (BCM)


?€¢
Heating, ventilation, and air conditioning (HVAC) control module


?€¢
Rear Defog relay


?€¢
Rear window defogger grid


Your probably better off taking this to a ASE certified repair facility ! You probably have bad Heater / A/C control panel . HVAC Control Module Malfunction

May 06, 2015 | Pontiac Cars & Trucks

2 Answers

Why is my rear defrost not working


Switch, fuse or maybe the wiring to the window has come loose or off, happens alot, kits are available at local auto parts stores...
I hope that helps...

Mar 02, 2015 | 2008 Chevrolet Malibu

1 Answer

Front defogger will not blow


sounds like the mode switch has gone bad and needs replacing.the mode switch is the one that changes the direction of air flow from defrost to dash to floor. if nothing has blocked the vents to the window then this is what it sounds like.

Jan 31, 2014 | 1998 Volkswagen Beetle

1 Answer

No defogger


front defog
or rear defog
the rear is a heater element, it has 2 wire terminals
if 12vdc is not present there, the relay feed is bad.
if 12vdc is present there the heater grid is open
got a voltmeter? (any kind, dmm, dvm, any)

Jan 11, 2014 | Acura TL Cars & Trucks

1 Answer

My rear window defogger won't defog. I pushed the button and the light comes on but it still won't work. I checked the fuses, and replaced the relay but it still won't work. I thought maybe I need to...


check the supply that goes into the rear screen. that connector must have power when switch is "on". if got power, you need to change the window.....

Nov 23, 2010 | 2005 Chevrolet Impala

2 Answers

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.

Nov 13, 2008 | 2005 Nissan Altima

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