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

My 2002 Lesabre lost interior lights, trunk release and rear defroster at the same time. Body fuse is not blown. W

What body fuse ? The body functions on your vehicle are controlled by three different control module . The IPM - instrument panel integration module ,the DIM - dash integration module an the RIM - rear integration module. Having the vehicle scanned for DTC'S - diagnostic trouble code's should always be the first step in a diagnostic procedure for this type problem . Not at auto zone or advance etc.... they can not pull code's from the body computers . When you push the button for the rear defroster ,trunk release ,these are input's to one of the front modules which will send a message over the class 2 data bus to the rear module which will energize a relay to pop the trunk or turn on the rear defroster . The rear module also controls the interior light's . Your best bet , take it to a qualified repair shop.

Nov 24, 2017 | Buick LeSabre Cars & Trucks

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.

May 12, 2012 | 2002 Buick LeSabre

1 Answer

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
All come from the Battery Negative Post

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.

Jan 10, 2010 | 1992 Buick LeSabre

1 Answer

Replacing brake light bulb

OPen the trunk and remove the access cover. The bulbs just twist out from the rear.

Nov 18, 2009 | 1998 Buick LeSabre

1 Answer

Rear license plate lights burned out and can't remove or replace them. Screws won't back out of assembly. 1997 Buick LeSabre

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.

Jun 30, 2009 | 1998 Buick LeSabre

1 Answer

Rear defrost on 1999 buicl park ave

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.

Apr 01, 2009 | 1999 Buick Park Avenue

1 Answer

98 LeSabre rear defroster ground wire

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.

Feb 23, 2009 | 1998 Buick LeSabre

1 Answer

Replacing brake lights on a 1998 Buick LeSabre

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


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
hope this helps...........thanks for choosing FIX YA!

Jan 04, 2009 | 1997 Buick LeSabre

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