Rear window defog circuitry. - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-15-2005, 12:13 PM   #11
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I don't have access to GMPD at work ...I'll do a search by part number. When you do that, GMPD returns all years and applicable vehicles the part was used on.

IF it finds the part number. It'* not 100% but pretty good.
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Old 12-15-2005, 01:14 PM   #12
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I ran the number for you. Here are the details:

http://www.gmpartsdirect.com/results...umber=25623688

But, it doesn't say what other cars it was used on.
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Old 12-15-2005, 01:38 PM   #13
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impatient,

my 97 has the same problem. during the weeks prior to it completely flaking, it smelled of burning wire insulation. when you fix yours, pm me and you can save me a lot of time pointing me to the right place so i can fix mine.
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Old 12-15-2005, 03:31 PM   #14
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Quote:
Originally Posted by vital49
I ran the number for you. Here are the details:

http://www.gmpartsdirect.com/results...umber=25623688

But, it doesn't say what other cars it was used on.
ACDelco.com does the cross reference.

http://www.acdelco.com/html/catalog/index_list.htm
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Old 12-15-2005, 05:17 PM   #15
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GMPD has the cross-reference as well, but you must use the advanced catalog feature.

For that price, I'd buy new.
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Old 11-01-2009, 11:04 PM   #16
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Quote:
Originally Posted by impatient99 View Post
I do know that with the relay clicking does not mean it is making continuity,
BTW all the grid lines are in good shape.

If just one or a few got cut, it would not knock out the whole grid cause the lines are in parallel connection.
I will check it out more and post my findings.
Check behind the rear passenger panel by the seatbelt, pull it off and behind it is the controller, mine was melted, everything else checks out fine. Why it melted I don't know. So when you replace it don't put the panel back on for awhile until you are sure it doesn't heat up and burn your ride.
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Old 11-02-2009, 12:32 PM   #17
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Please look at the dates in threads when you search, they probably fixed their problem back in 2005
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Old 11-02-2009, 09:15 PM   #18
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Quote:
Originally Posted by impatient99 View Post
It is # 25623688

I would like to see how to do this cross reference for applications.
Like i said, this one is for grid antenna and the defog. Not all H'* have both features, i don't think.

I did come across that site, and i am maybe going to go to the junkyard here soon.
Would be nice to have a list of vehicles to choose from.
I just hope they are ALL burned out, you know how in some cars, EVERY one throws the same part?
I am still suprised that my thread is the only one like this in the 92-99, and limited threads returned from the search.
I don't recall having a choice when ordering my 98 leSabre. Radio and all had rear window defog. It'* possible radio could be deleted on fleet orders...

1996-1999 Buick LeSabre
1997-2005 Buick Park Avenue
1997-1997 Oldsmobile 88
1997-1997 Oldsmobile LSS
1997-1997 Oldsmobile Regency

for the part number above.
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Old 11-02-2009, 09:41 PM   #19
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Please reference my above post and the thread https://www.gmforum.com/t285283/
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Old 01-25-2011, 12:58 AM   #20
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Quote:
Originally Posted by impatient99 View Post
I did a search for this, but nothing came up for the 1992-99.

My 1999 LeSabre has a malfunctioning rear window defog.
The switch works fine, but the grid does not heat up.
In my Haynes manual, there is nothing in the diagrams about it. The wires in the back are still connected to the grid.
I can hear the relay kick on when I hit the defog button, all the fuses are OK (altho i have not looked at the hidden fuses beside the glove compartment)

I would like to know exactly where this relay is, so i can test it completely instead of just listening for it.

Does anyone know exactly where the wires run from or of any common problems?
I just pulled out the plastic pieces that cover the wiring to the defroster on my 2003 park ave which the defroster had stopped working in. These are the pieces just to the left and right side of you rear window. I found a module on the driver side of the rear window GM 2562368 that is burnt and the wiring connector to it is also burnt. I had 12vdc from ground to the wiring in the connector when the power to the defroster was turned on. I am going to look for this part tomorrow as well as a new connector. I don't know what caused it to burn up, but i am going to try to replace it.
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