Question about 2002 Pontiac Grand Prix

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Where does the ground wire for the rear window defroster attach to the body in the trunk? I have a 1998 Buick LeSabre.

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Inside the car on the right or left of the back glass under trim panel

Posted on Feb 23, 2009

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I think you will find that it is attached behind the panel on the inside of the car beside the window.

Posted on Feb 23, 2009

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1 Answer

Electric door locks, trunk release, courtesy lights and rear window defroster have quit all at once


The first thing to check that can affect all of those things at once would be the "BODY" fuse. This is a 15 Amp fuse, located in the rear fuse block. The rear fuse block is located under the rear seat.

If this fuse is blown, you need to have the circuits diagnosed to find out why. Failure to locate and repair the CAUSE of the fuse blowing will only result in the fuse blowing again.

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Rear defroster lights up, but does not defrost, also very weak car radio reception.


Between the rear passenger window and the back window is a junction where rear defrost wiring and radio antenna connect. Rear defrost wiring becomes loose and burns this unit out. when looking for replacement at salvage yard everyone of them I found had burned up. Lots of La Sabres w/o working rear defrost. I made solid connections for defroster, and added an antennae, not much point in repeating a system that will fail again.

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Where can i find a ground in the trunk of my 1997 buick le sabre


Ground Wire?

Your entire body,all fluids, engine block,trans
etc, are at ground potential

Electrons (Amps/Current) travel thru the body
& return to the Battery on the wires.

All Black Wires are grounds
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Jun 12, 2011 | 1997 Buick LeSabre

1 Answer

The defroster only works occasionally, and only for a minute before stopping. It appears there is a short somewhere. My mechanic can not make heads or tails of the sea of wires beneath the dashboard. what...


During the restoration of our '92 Lesabre, we had an auto glass guy come out to remove & hopefully replace the same glass in the rear window section(the window trim had disintegrated and we bought new stuff to replace it with, but it wouldn't fit unless the window was removed).
What was discovered when the window was removed... was that the defroster interface on the sides of the glass was basically disconnected from the glass: the solder contact patch where the power & ground wires interfaced with the defrosting wires was corroded. It fell off once it was pulled on. In our case we had the whole rear window replaced.

What may be possible for you to do is pull back/off the rear pillar trim that covers the defrost wire & connectors and re-melt the solder with a 80-150 watt soldering iron(assuming that is where the problem is). I suppose, before buying and/or firing up the soldering iron, get the rear trim that covers the left & right edges of the rear-glass removed to find out IF the connectors & the long vertical strip they attach to are indeed attached to or detached from the glass. Oh duh, the vertical strip that the power wires connect to on either side run from top to bottom of the defroster array and are the portions that solder to the glass.

If it results in soldering, I'd suggest you use either a resin/flux core electrical solder or use a flux paste brushed over the solder contact areas & use solid electrical solder.

If I wasn't so busy with other parts of the car I would have gone after the soldering myself... but being as pre-occupied as I was that's why we opted to have the whole window(which includes the defrosting array & connectors) replaced.
I hope things work out for you regarding this... shoot me back if you need any other info/follow-up.

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If i remember correctly the entire rear light assembly must be remove in order to access these bulbs. This is true if the license plate is on the trunk. If this is the case then there are nuts on the inside of the trunk that must be removed.

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Jeff, If you have already checked the fuses, check the wires attached to the defroster Grid. You may be able to see them inside the rear window. Make sure they are still connected. You might also want to check in the trunk the wires may run into it, and might have peen pulled apart when you put somthing in the trunk. As a last resort take a continuity tester and check the grid itself to make sure it hasn't failed altogether. Un plug the wires b-4 you test it to avoid a false reading.

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I would expect to find the conections behind the panel on the inside of the car beside the glass and not in the trunk. You might check the fuse as this draws alot and will be on a fuse almost by itself.

Older cars did connect in the trunk and then it was right below where the glass is and one of the sides will bolt to the car and the other side will plug in.

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the covering often is just a press fit on... then remove that... look on each side to make sure there are not any screws... then the bulbs can be replaced from there.... or you may want to climb into the trunk and look up... you may be able to change them from there

Robert

Please take a moment to rate this solution.. thanks

Jan 23, 2009 | 1998 Buick LeSabre

1 Answer

Rear defrost on 97 buick lesabre not working


your problem is in the window..........if you are getting 12v to the wires that connect to the window the lines in the window must have a break in them ............. they must conduct the dc volts to complete the circut, the lines heat form the voltage running through them thus ridding your window of fog and ice
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