I recently had the mechanic check my rear defroster during an oil change. When I picked it up, they said it worked fine, everything tested out. The next morning I found it still didn't work. The Lead mechanic mentioned that his team must not have checked the ground, and that it was located in the trunk attached to the body of the car. Can anyone tell me exactly where this ground wire is located? There is a metal plate below the window which makes it hard to detect where to look. Plus the trunk is lined. I'd like to only pull the lining out where needed. Thanks!
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Re: 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.
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Even good mechanics make mistakes. I'd take the car back to the mechanic who changed the oil and tell him the problem, and ask if he'll check to see if he knocked a connection loose. If he gives you a hard time, take it somewhere else. As you guessed, it's probably just a loose or disconnected wire to the transmission.
check comp for power ;make sure its plugged in but if its not then, look to the rear of the car ,bumper look for a air fill line along the bumper or in the trunk if ther is one then the bi-passed the pump
Unless I am missing your question, there is no main ground. The battery cable is grounded to the engine and the engine has a ground cable back to the body or frame. That cable may also have a smaller wire going to a body ground. The car uses the body to connect ground cables to for components to get power back to the battery.
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.
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.
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!