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2004 chevy cobalt rear window defogger wiring diagram

Defogger light on dash works. no power going to the grid on the rear windshield. the grid is good.

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6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: 1997 honda accord - rear window defogger not working

check the grid ground

Posted on Dec 15, 2008

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SOURCE: 2003 Envoy Both the rear windshield wiper and defogger quit

Have you checked the wire harness that goes between the hatch and the body? The constant opening and closing weakens the wires. Could also be the ground wire, I believe is inside the hatch. It could have come undone. If you have an owners manual, it should guide you to the defogger fuse. Hope this helps. Best wishes.

Posted on Jan 17, 2009

  • 3640 Answers

SOURCE: rear window defogger does not function, fuse good,

check the defog switch it might be bad.the light will not be lit if the switch is bad.

Posted on Oct 05, 2009

  • 34 Answers

SOURCE: dash defogger does NOT blow on windshield.

this could be a simple switch problem, if it is a rotary switch, pull the front of it off and try turning the little knob with pliers, the cheap plastic used now sometimes rounds off if this isnt problem depending on type of switch electrical connections on switch could be bad or vaccum could be plugged or non existant

Posted on Oct 10, 2009

wracefans24
  • 1985 Answers

SOURCE: 2004 chevy monte carlo,,,,rear defogger and

no, if your wipers are working then the pump has power,if you cannot hear the the washer pump working ,it will need replaced they are about $25.00 at Autozone,

Posted on Jan 21, 2010

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1 Answer

Wiring diagram for 2005 grand marquis for rear defroster


Relay maybe . free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size . Under system click Body & accessories ,then under subsystem click on rear window defogger . Click the search button then the blue link .Looking at the diagram you will see three fuse's , a relay ,lighting control module , defroster switch . The switch is a input to the lighting control module , the lighting control module will supply a ground to the control side of the rear window defroster relay ,energizing the relay sending B+ power to the defroster grid.

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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

Rear Window Defogger


check the wire for power, at back window. if it has power, the window grid for defroster maybe bad. if no power. check for a broken wire to back window. good-day!

Apr 20, 2014 | 1995 GMC Sierra C1500

1 Answer

Rear defrost


There is usually a relay involved in the rear defogger circuit. I would check for power on the wire at the window connector with key on and defroster button on. If power there, the window grid may have a break. If no power, will have to work back in the wiring diagram.

Dec 19, 2013 | 2002 Pontiac Sunfire

1 Answer

Which fuse do I replace for rear window defogger in a 2001 nissan almera


There may be a fuse in the fuse panel under dash, but defoggers are often found with a circuit breaker rather than a fuse. There may also be a relay in the circuit to the rear window. You could pull off the connector at the window, and with key on and defogger switch on, check for power at the connector. If you have power, one of the grid wires on the window may be broken. Kits are available to fix that.
If no power at the window, IDK, may have to find a wiring diagram, or have an electrician or mechanic start looking into it. Good luck.

Dec 30, 2012 | Nissan Almera Cars & Trucks

2 Answers

Need wiring diagram of rear-window defogger circuit for 2008 Chevy Impala LT


i just fixed my car to the exact question above, it took 20 minutes total. yes I\'m good with a wrench, but this fix doesn\'t reqire you to be.

Problem: Rear defroster doesn\'t work, but the fuse is good and the little light comes on on the button.

Answer: Go to front passenger kick panel where the "other" fise box is and remove the pastic panel, it just pops straight up. Under the fuse block is a white plug that connects front wire harness to the rear harness. this is where the problem is. pull the connector off the body, my plugslide straight back. Now flip the whole connector over, there you\'ll see the burnt spot on the plug. losse, corroded connection causes melt down. this stuff happens. my car has a purple wire going into the plug and a black one coming out, this is the rear defroster wire. cut the purple wire aleast a half inch before the plug and cut the black one coming out of the plug the same, always leave a little wire incase you ever want to reuse that terminal, standard rule. now take two butt connectoers and a four inch piece of ten gauge and splice the purple and black wires back together. lots of current so DO NOT use 12-14 gauage wire, it will melt. and Wa-La, its fixed!! since you dont have to do the trouble shooting and chase down the wires like i did, should take you ten minutes to fix.

Now if this doesn\'t fix your car, then don\'t pay me!!

If this DOES fix your car, then take your wife out to dinner with the $150.00 i just saved you from having to take it to the dealer,

(they would sale you new connectors and harness)

Oct 30, 2012 | 2008 Chevrolet Impala LT

2 Answers

Rear defogger doesn't work even though dash lite works


Couple of things to check - first look for any scratches through lines, a couple of scratches will not let power run from side to side. The other is -> with a test light or voltage meter -> put (+)cable of meter/light to small electrical connector that attached to your window and (-) cable to a good ground (metal) light will come on/meter should read voltage there.

Mar 02, 2011 | 1998 Chevrolet Cavalier

6 Answers

Hyundai XG350 rear defogger doesn't work. I have changed the relays, checked all the fuses all good, dash switch works because I changed that too. checked the wire to the grid thats' ok too. now what?


The rear defogger is controlled by the Electronic Time and Alarm Control Module (ETACM). It receives a signal from the switch, and if the car is running, turns on the rear window defogger. Most frequently the problem is a blown 30A defogger fuse. Other common problems are the defogger switch itself or the switch not being plugged in properly, but there can also be a bad defogger relay, defective ETACM, or wiring issue. If you're capable of doing some electrical diagnosis, I'd encourage you to register for a free account at www.hmaservice.com (requires Internet Explorer and Adobe SVG Viewer) and print the schematic from the site. Also, does the indicator lamp come on when you depress the defogger button,I hope this help you in the right direction now you know how it works

Feb 12, 2010 | Hyundai XG350 Cars & Trucks

2 Answers

93Toyota Corolla DX > Rear Defogger Inop


If you have a 12 volt test lamp, try this: Turn on the rear defroster. Attach the clamp to a good ground point; the door latch hoop is good)...Now, touch the test lamp to the extreme left and extreme right sides of the grids, on the inside of the glass. If the light does not light in either place, you probably either have a bad defroster relay, or the wires coming to the rear grids is off. Please feel free to get back to me with the results of your test.

Apr 05, 2009 | 1993 Toyota Corolla

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