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11-30-2008, 07:46 PM | #1 | |
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2006 Rear Defroster
Have an 06 Impala 3.5L. Rear defroster not working, but light comes on at button. Went and replaced relay at under-hood fuse box, but that didn't fix it. Are there any fuses or switches in this system (besides the relay)?
Can anyone thing of anything else I could check? I don't really feel like getting screwed at the dealer for something this small, but it's pretty important for the winter. |
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12-01-2008, 06:15 PM | #2 | ||
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Re: 2006 Rear Defroster
Quote:
obviously measure for 12volts across the connectors...in/out...not body ground but across this window grid... |
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12-03-2008, 08:39 AM | #3 | ||
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Re: 2006 Rear Defroster
Quote:
Checked the resistance, wasnt open, looks good. Not getting any voltage across the connectors. I'm wondering if there's more to the system than a relay, perhaps a fuse that's not so obvious? Thanks |
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12-03-2008, 09:45 AM | #4 | ||
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Re: 2006 Rear Defroster
Quote:
If this is good then you must trace the wire back...also make sure that the grid wires have a ground on one...MEASURE THE VOLTAGE TO A GOOD METAL GROUND POINT...MAYBE THE GROUND IS THE PROBLEM.. |
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12-03-2008, 10:47 AM | #5 | |
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Re: 2006 Rear Defroster
There is a TSB on it:
#PIC4684: Rear Window Defogger Inoperative - keywords back defog defrost fixed glass stationary - (Nov 16, 2007 TSB states: It has been found in some cases that there may be a terminal concern at C200. Inspect terminal D6, circuit 293, for being fully seated in the connector and for proper terminal tension. If there are no concerns with the terminals in C200 continue with the diagnostics in SI This is inside the big body to Instrument Panel Connector - 40 cavities in this connector - Body wiring harness to the I/P wiring harness, behind the right front kick panel, below the I/P fuse panel circuit 293 terminal D6 -- Purple wire Rear Defog Element Supply Voltage Looks like the Heated Mirror Fuse (10 amp) is your fuse of concern in the underhood fuse / relay center
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Automotive A/C Engineer with: '99 IH 4700 Toy Hauler (2) '95 GEO Prizms both maroon '99 GMC Yukon '95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller. '94 Astro- 370k miles '94 Firebird Formula- 5.7L 180k miles- gone- '92 Chevy Lumina Van 3.8L 264k '86 GMC S-15 - 2.8L 154k '87 Buick Park Ave . 187k '86 Buick Park Ave 3.8L 199k miles- gone '77 Chevy Vega- 2.5L 175k miles gone but not forgotten '68 Camaro 396 4 spd RS/SS -72k miles- |
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12-13-2008, 08:19 PM | #6 | ||
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Re: 2006 Rear Defroster
Quote:
Ogre |
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01-01-2009, 08:20 PM | #7 | |
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Re: 2006 Rear Defroster
This is what happened in case anyone has a similar issue:
Terminal connection D4 at C200 shorted out and melted terminal at C200. Fixed it by splicing and bypassing around C200. |
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01-01-2009, 08:47 PM | #8 | |
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Re: 2006 Rear Defroster
The term "shorted out" refers to 12v to ground-
Normally, burnt contacts mean a poor connection that arcs and can't carry the current, the arcing produces heat which melts the plastic connector enough until the circuit is completely open. There was most likely no short involved- this would have blown the respected fuse and led you to the circuit/answer sooner- This was simply an open circuit due to a poor connection. Glad you found it and posted back your results.
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Automotive A/C Engineer with: '99 IH 4700 Toy Hauler (2) '95 GEO Prizms both maroon '99 GMC Yukon '95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller. '94 Astro- 370k miles '94 Firebird Formula- 5.7L 180k miles- gone- '92 Chevy Lumina Van 3.8L 264k '86 GMC S-15 - 2.8L 154k '87 Buick Park Ave . 187k '86 Buick Park Ave 3.8L 199k miles- gone '77 Chevy Vega- 2.5L 175k miles gone but not forgotten '68 Camaro 396 4 spd RS/SS -72k miles- |
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01-02-2009, 08:37 AM | #9 | ||
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Re: 2006 Rear Defroster
Quote:
this post of your findings will help others..thanks for this info.. |
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04-25-2009, 08:38 AM | #10 | ||
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Re: 2006 Rear Defroster
Quote:
I'd like to get more info as well on the location of the connector(s) to check. |
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04-28-2009, 11:02 AM | #11 | ||
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Re: 2006 Rear Defroster
Quote:
follow the wires back to to fwd part of vehicle...in the rear door area you should find these other connectors, if burn't/green replace these connectors...use a heavy duty crimp type and tape securely so moisture will not re damage this .....radio shack or an electrical supply store has good connectors to properly repair this.. |
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01-13-2010, 05:52 AM | #12 | |
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Re: 2006 Rear Defroster
In what side of the vehicle is this on drivers or pass. . My son is having the same problem. Thanks
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01-13-2010, 08:21 AM | #13 | ||
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Re: 2006 Rear Defroster
Quote:
the ground issue is common ... |
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01-13-2010, 03:57 PM | #14 | |
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Re: 2006 Rear Defroster
Come on, guys. We don't all have the tech manuals for these cars. We don't all work in a garage with access to these documents.
Most of us have a multimeter, soldering iron, crimpers, basic stuff; and enough knowledge to not hurt ourselves. I have been fighting a battle with my rear defrost for almost 5 years now, finding something to check here or there, when I get the chance, or trying to trace wires when I get a chance, but I still have not fixed this problem with my rear defrost. I have taken the rear seat out, laid in the trunk, and still I can't really trace the wires back without completely dismantling my wire harness from the trunk forward. I asked for some help on locating the circuits in question a little over a year ago. All I got was pdigital telling us what circuit and terminal he had trouble with, and now jcat you tell us to trace the wire back. Would someone please help me (and other future readers of this post) to locate the terminal or wires in question? Thanks. |
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01-14-2010, 12:43 PM | #15 | |
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Re: 2006 Rear Defroster
so with your meter what did you find..?
the vehicles change from year to year esp. on electrical wiring and ckts.. hard to say were it is exactly and describe the exact location.. if you have the basic tools and know how to use them this is a simple problem.. |
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